Mind

For other uses, seeMind (disambiguation).

Themindis that whichthinks,feels,perceives,imagines,remembers,andwills.The totality ofmentalphenomena, it includes bothconsciousprocesses, through which an individual is aware of external and internal circumstances, andunconsciousprocesses, which can influence an individual without intention or awareness. Traditionally, minds were often conceived as separate entities that can exist on their own but are more commonly understood as features or capacities of other entities in the contemporary discourse. The mind plays a central role in most aspects of human life but its exact nature is disputed; some theorists suggest that allmental phenomenaare private and directly knowable, transform information, havethe ability to refer to and represent other entities,or are dispositions to engage in behavior.

The mind is responsible for phenomena likeperception,thought,feeling,andaction.

Themind–body problemis the challenge of explaining the relation between matter and mind. The dominant position today isphysicalism,which says that everything is material, meaning that minds are certain aspects or features of some material objects. The evolutionary history of the mind is tied to the development of thenervous system,which led to the formation of brains. As brains became more complex, the number and capacity of mental functions increased with particular brain areas dedicated to specific mental functions. Individual human minds also develop as they learn from experience and pass through psychological stages in the process of aging. Some people are affected bymental disorders,for which certain mental capacities do not function as they should.

It is widely accepted that animals have some form of mind, but it is controversial to which animals this applies. The topic ofartificial mindsposes similar challenges, with theorists discussing the possibility and consequences of creating them using computers.

The main fields of inquiry studying the mind includepsychology,neuroscience,cognitive science,andphilosophy.They tend to focus on different aspects of the mind and employ different methods of investigation, ranging fromempirical observationandneuroimagingtoconceptual analysisandthought experiments.The mind is relevant to many other fields, includingepistemology,anthropology,religion, and education.

Definition

The mind is the totality of psychological phenomena and capacities, encompassingconsciousness,thought,perception,sensation,feeling,mood,motivation,behavior,memory,andlearning.The term is sometimes used in a more narrow sense to refer only to higher or more abstract cognitive functions associated withreasoningandawareness.Minds were traditionally conceived as immaterial substances or independent entities and contrasted withmatterandbody.In the contemporary discourse, they are more commonly seen as features of other entities and are often understood as capacities of material brains.The precise definition of mind is disputed and while it is generally accepted that some non-human animals also have mind, there is no agreement on where exactly the boundary lies.Despite these disputes, there is wide agreement that mind plays a central role in most aspects of human life as the seat of consciousness, emotions, thoughts, and sense of personal identity.Various fields of inquiry study the mind; the main ones includepsychology,cognitive science,neuroscience,andphilosophy.

The wordspsycheandmentalityare usually used as synonyms ofmind.They are often employed in overlapping ways with the termssoul,spirit,cognition,intellect,intelligence,andbrainbut their meanings are not exactly the same. Some religions understand the soul as an independent entity that constitutes the immaterial essence of human beings, is of divine origin, survives bodily death, and isimmortal.The wordspirithas various additional meanings not directly associated with mind, such asa vital principle animating living beingsor asupernatural beinginhabiting objects or places.Cognition encompasses certain types of mental processes in whichknowledgeis acquired andinformationprocessed.The intellect is one mental capacity responsible for thought, reasoning, and understandingand is closely related to intelligence as the ability to acquire, understand, and apply knowledge.The brain is the physical organ responsible for most or all mental functions.

The modern English wordmindoriginates from theOld Englishwordgemynd,meaning "memory". This term gave rise to theMiddle Englishwordsmind(e),münd(e),andmend(e),resulting in a slow expansion of meaning to cover all mental capacities. The original meaning is preserved in expressions likecall to mindandkeep in mind.Cognatesinclude theOld High Germangimunt,theGothicgamunds,theancient Greekμένος,theLatinmens,and theSanskritmanas.

Forms

The mind encompasses many functions and processes, includingperception,memory,thought,imagination,motivation,emotion,attention,learning,andconsciousness.Perception is the process of interpreting and organizingsensory informationto become acquainted with the environment. This information is acquired throughsense organsreceptive to various types ofphysical stimuli,which correspond to different forms of perception, such asvision,sound,touch,smell,andtaste.The sensory information received this way is a form of raw data that is filtered and processed to actively construct a representation of the world and the objects within it. This complex process underlying perceptual experience is shaped by many factors, including the individual's pastexperiences,cultural background, beliefs, and expectations.

Memory is the mechanism of storing and retrieving information.Episodic memoryhandles information about specific past events in one's life and makes this information available in the present. When a person remembers what they had for dinner yesterday, they employ episodic memory.Semantic memoryhandles general knowledge about the world that is not tied to any specific episodes. When a person recalls that the capital of Japan is Tokyo, they usually access this general information without recalling the specific instance when they learned it.Procedural memoryis memory of how to do things, such as riding a bicycle or playing a musical instrument.Another distinction is betweenshort-term memory,which holds information for brief periods, usually with the purpose of completing specific cognitive tasks, andlong-term memory,which can store information indefinitely.

Thinking involves the processing of information and the manipulation ofmental representations.It is a goal-oriented activity that often happens in response to experiences as a symbolic process aimed at making sense of them, organizing their information, and deciding how to respond.Logical reasoningis a form of thinking that starts from a set of premises and aims to arrive at a conclusion supported by these premises. This is the case when deducing that "Socrates is mortal" from the premises "Socrates is a man" and "all men are mortal".Problem-solvingis a closely related process that consists of several steps, such as identifying a problem, developing a plan to address it, implementing the plan, and assessing whether it worked.Thinking in the form ofdecision-makinginvolves considering possible courses of action to assess which one is the most beneficial.As a symbolic process, thinking is deeply intertwined with language and some theorists hold thatall thought happens through the medium of language.

Imagination is a creative process of internally generating mental images. Unlike perception, it does not directly depend on the stimulation of sensory organs. Similar todreaming,these images are often derived from previous experiences but can include novel combinations and elements. Imagination happens duringdaydreamingand plays a key role in art and literature but can also be used to come up with novel solutions to real-world problems.

Motivation is an internal state that propels individuals to initiate, continue, or terminate goal-directed behavior. It is responsible for the formation ofintentionsto performactionsand affects what goals someone pursues, how much effort they invest in the activity, and how long they engage in it.Motivation is affected by emotions, which are temporary experiences of positive or negative feelings like joy or anger. They are directed at and evaluate specific events, persons, or situations. They usually come together with certain physiological and behavioral responses.

Attention is an aspect of other mental processes in which mental resources likeawarenessare directed towards certain features of experience and away from others. This happens when a driver focuses on the traffic while ignoring billboards on the side of the road. Attention can be controlled voluntarily in the pursuit of specific goals but can also occur involuntarily when a strong stimulus captures a person's attention.Attention is relevant to learning, which is the ability of the mind to acquire new information and permanently modify its understanding and behavioral patterns. Individuals learn by undergoing experiences, which helps them adapt to the environment.

Conscious and unconscious

Main articles:ConsciousnessandUnconscious mind

An influential distinction is between conscious and unconscious mental processes. Consciousness is the awareness of external and internal circumstances. It encompasses a wide variety of states, such as perception, thinking, fantasizing, dreaming, andaltered states of consciousness.In the case of phenomenal consciousness, the awareness involves a direct and qualitative experience of mental phenomena, like the auditory experience of attending a concert. Access consciousness, by contrast, refers to an awareness of information that is accessible to other mental processes but not necessarily part of current experience. For example, the information stored in a memory may be accessible when drawing conclusions or guiding actions even when the person is not explicitly thinking about it.

Unconscious or nonconscious mental processes operate without the individual's awareness but can still influence mental phenomena on the level of thought, feeling, and action. Some theorists distinguish between preconscious, subconscious, and unconscious states depending on their accessibility to conscious awareness.When applied to the overall state of a person rather than specific processes, the termunconsciousimplies that the person lacks any awareness of their environment and themselves, like during acoma.The unconscious mind plays a central role inpsychoanalysisas the part of the mind that contains thoughts, memories, and desires not accessible to conscious introspection. According toSigmund Freud,thepsychological mechanismofrepressionkeeps disturbing phenomena, like unacceptable sexual and aggressive impulses, from entering consciousness to protect the individual. Psychoanalytic theory studies symptoms caused by this process and therapeutic methods to avoid them by making the repressed thoughts accessible to conscious awareness.

Other categories of mental phenomena

Mental statesare often divided into sensory and propositional states. Sensory states are experiences of sensory qualities, often referred to asqualia,like colors, sounds, smells, pains, itches, and hunger. Propositional states involve anattitudetowards a content that can be expressed by adeclarative sentence.When a person believes that it is raining, they have the propositional attitude of belief towards the content "it is raining". Different types of propositional states are characterized by different attitudes towards their content. For instance, it is also possible to hope, fear, desire, or doubt that it is raining.

A mental state or process isrationalif it is based on good reasons or follows the norms of rationality. For example, a belief is rational if it relies on strong supportingevidenceand a decision is rational if it follows careful deliberation of all the relevant factors and outcomes. Mental states are irrational if they are not based on good reasons, such as beliefs caused by faulty reasoning,superstition,orcognitive biases,and decisions that give intotemptationsinstead of following one's best judgment.Mental states that fall outside the domain of rational evaluation are arational rather than irrational. There is controversy regarding which mental phenomena lie outside this domain; suggested examples include sensory impressions, feelings, desires, and involuntary responses.

Another contrast is betweendispositionaland occurrent mental states. A dispositional state is a power that is not exercised. If a person believes that cats have whiskers but does not think about this fact, it is a dispositional belief. By activating the belief to consciously think about it or use it in other cognitive processes, it becomes occurrent until it is no longer actively considered or used. The great majority of a person's beliefs are dispositional most of the time.

Faculties and modules

Traditionally, the mind was subdivided into mental faculties understood as capacities to perform certain functions or bring about certain processes.An influential subdivision in thehistory of philosophywas between the faculties of intellect and will.The intellect encompasses mental phenomena aimed at understanding the world and determining what to believe or what is true; the will has a practical orientation focused on desire, decision-making, action, and what is good.The exact number and nature of the mental faculties are disputed and more fine-grained subdivisions have been proposed, such as dividing the intellect into the faculties of understanding and judgment or adding sensibility as an additional faculty responsible for sensory impressions.

In theMüller-Lyer illusion,the horizontal black lines have the same length but the top line appears longer. The illusion persists even after becoming aware of it because of the automatic functioning of mental modules responsible for low-level visual processing.

In contrast to the traditional view, more recent approaches analyze the mind in terms ofmental modulesrather than faculties.A mental module is an inborn system of the brain that automatically performs a particular function within a specific domain without conscious awareness or effort. In contrast to faculties, the concept of mental modules is normally used to provide a more limited explanation restricted to certain low-level cognitive processes without trying to explain how they are integrated into higher-level processes such as conscious reasoning.Many low-level cognitive processes responsible for visual perception have this automatic and unconscious nature. In the case ofvisual illusionslike theMüller-Lyer illusion,the underlying processes continue their operation and the illusion persists even after a person has become aware of the illusion, indicating the mechanical and involuntary nature of the process.Other examples of mental modules concern cognitive processes responsible forlanguage processingandfacial recognition.

Theories of the nature of mind

Theories of the nature of mind aim to determine what allmental stateshave in common. They seek to discover the "mark of the mental", that is, the criteria that distinguish mental from non-mental phenomena.Epistemic criteria say that the unique feature of mental states is how people know about them. For example, if a person has a toothache, they have direct or non-inferential knowledge that they are in pain. But they do not have this kind of knowledge of the physical causes of the pain and may have to consultexternal evidencethrough visual inspection or a visit to the dentist. Another feature commonly ascribed to mental states is that they are private, meaning that others do not have this kind of direct access to a person's mental state and have to infer it from other observations, like the pain behavior of the person with the toothache. Some philosophers claim that knowledge of some or all mental states isinfallible,for instance, that a person cannot be mistaken about whether they are in pain.

A related view states that all mental states are either conscious or accessible to consciousness. According to this view, when a person actively remembers the fact that the Eiffel Tower is in Paris then this state is mental because it is part of consciousness; when the person does not think about it, this belief is still a mental state because the person could bring it to consciousness by thinking about it. This view denies the existence of a "deep unconsciousness", that is, unconscious mental states that cannot in principle become conscious.

Another theory says thatintentionalityis the mark of the mental. A state is intentional if it refers to or represents something. For example, if a person perceives a piano or thinks about it then the mental state is intentional because it refers to a piano. This view distinguishes between original and derivative intentionality. Mental states have original intentionality while some non-mental phenomena have derivative intentionality. For instance, the wordpianoand a picture of a piano are intentional in a derivative sense: they do not directly refer to a piano but if a person looks at them, they may evoke in this person a mental state that refers to a piano. Philosophers who disagree that all mental states are intentional cite examples such as itches, tickles, and pains as possible exceptions.

According tobehaviorism,mental states are dispositions to engage in certain publicly observable behavior as a reaction to particular external stimuli. This view implies that mental phenomena are not private internal states but are accessible to empirical observation like regular physical phenomena.Functionalismagrees that mental states do not depend on the exact internal constitution of the mind and characterizes them instead in regard to their functional role. Unlike behaviorism, this role is not limited to behavioral patterns but includes other factors as well. For example, part of the functional role ofpainis given by its relation to bodily injury and its tendency to cause behavioral patterns like moaning and other mental states, like a desire to stop the pain.Computationalism,a similar theory prominent in cognitive science, defines minds in terms of cognitions andcomputationsas information processors.

Theories under the umbrella ofexternalismemphasize the mind's dependency on the environment. According to this view, mental states and their contents are at least partially determined by external circumstances.For example, some forms of content externalism hold that it can depend on external circumstances whether a belief refers to one object or another.Theextended mind thesisstates that external circumstances not only affect the mind but are part of it, like a diary or a calculator extend the mind's capacity to store and process information.The closely related view ofenactivismholds that mental processes involve an interaction between organism and environment.

Relation to matter

Mind–body problem

Main article:Mind–body problem

Different approaches toward resolving the mind–body problem

The mind–body problem is the difficulty of providing a general explanation of the relationship between mind and body, for example, of the link between thoughts and brain processes. Despite their different characteristics, mind and body interact with each other, like when a bodily change causes mental discomfort or when a limb moves because of anintention.According tosubstance dualism,minds orsoulsexist as distinctsubstancesthat have mental states while material things are another type of substance. This view implies that, at least in principle, minds can exist without bodies.Property dualismis another form ofdualismthat says that mind and matter are not distinct individuals but differentpropertiesthat apply to the same individual.Monistviews, by contrast, state that reality is made up of only one kind. According toidealists,everything is mental.They understand material things as mental constructs, for example, as ideas or perceptions.According toneutral monists,the world is at its most fundamental level neither physical nor mental but neutral. They see physical and mental concepts as convenient but superficial ways to describe reality.

The monist view most influential in contemporary philosophy isphysicalism,also referred to asmaterialism,which states that everything is physical.According toeliminative physicalism,there are no mental phenomena, meaning that things like beliefs and desires do not form part of reality.Reductive physicalistsdefend a less radical position: they say that mental states exist but can, at least in principle, be completely described by physics without the need for special sciences like psychology. For example,behavioristsaim to analyze mental concepts in terms of observable behavior without resorting to internal mental states.Type identity theoryalso belongs to reductive physicalism and says that mental states are the same as brain states.Whilenon-reductive physicalistsagree that everything is physical, they say that mental concepts describe physical reality on a more abstract level that cannot be achieved by physics.According tofunctionalism,mental concepts do not describe the internal constitution of physical substances but functional roles within a system.One consequence of this view is that mind does not depend on brains but can also berealized by other systemsthat implement the corresponding functional roles, possibly also computers.

Thehard problem of consciousnessis a central aspect of the mind–body problem: it is the challenge of explaining how physical states can give rise to conscious experience. Its main difficulty lies in thesubjectiveand qualitative nature of consciousness, which is unlike typical physical processes. The hard problem of consciousness contrasts with the "easy problems" of explaining how certain aspects of consciousness function, such as perception, memory, or learning.

Brain areas and processes

Another approach to the relation between mind and matter uses empirical observation to study how the brain works and which brain areas and processes are associated with specific mental phenomena.The brain is the central organ of thenervous systemand is present in allvertebratesand the majority ofinvertebrates.Thehuman brainis of particular complexity and consists of 86 billionneurons,which communicate with one another viasynapses.They form a complexneural networkand cognitive processes emerge from their electrical and chemical interactions.The human brain is divided into regions that are associated with different functions. The main regions are thehindbrain,midbrain,andforebrain.The hindbrain and the midbrain are responsible for many biological functions associated with basic survival while higher mental functions, ranging from thoughts to motivation, are primarily localized in the forebrain.

Thecerebral cortexis divided into various areas with distinct functions, like theprefrontal cortex(shown in orange) responsible forexecutive functions.

The primary operation of many of the main mental phenomena is located in specific areas of the forebrain. Theprefrontal cortexis responsible forexecutive functions,such as planning, decision-making, problem-solving, and working memory.The role of thesensory cortexis to process and interpret sensory information, with different subareas dedicated to different senses, like thevisualand theauditory areas.A central function of thehippocampusis the formation and retrieval of long-term memories. It belongs to thelimbic system,which plays a key role in the regulation of emotions through theamygdala.Themotor cortexis responsible for planning, executing, and controlling voluntary movements.Broca's areais a separate region dedicated tospeech production.The activity of the different areas is additionally influenced byneurotransmitters,which aresignaling moleculesthat enhance or inhibit different types of neural communication. For example,dopamineinfluences motivation and pleasure whileserotoninaffects mood and appetite.

The close interrelation of brain processes and the mind is seen by the effect that physical changes of the brain have on the mind. For instance, the consumption ofpsychoactive drugs,like caffeine,antidepressants,alcohol, andpsychedelics,temporarily affectsbrain chemistrywith diverse effects on the mind, ranging from increased attention to mood changes, impaired cognitive functions, andhallucinations.Long-term changes to the brain in the form ofneurodegenerative diseasesandbrain injuriescan lead to permanent alterations in mental functions.Alzheimer's diseasein its first stage deteriorates the hippocampus, reducing the ability to form new memories and recall existing ones.An often-cited case of the effects of brain injury isPhineas Gage,whose prefrontal cortex was severely damaged during a work accident when an iron rod pierced through his skull and brain. Gage survived the accident but hispersonalityand social attitude changed significantly as he became more impulsive, irritable, and anti-social while showing little regard for social conventions and an impaired ability to plan and make rational decisions.Not all these changes were permanent and Gage managed to recover and adapt in some areas.

Development

Evolution

The mind has a long evolutionary history starting with thedevelopment of the nervous systemandthe brain.While it is generally accepted today that mind is not exclusive to humans and various non-human animals have some form of mind, there is no consensus at which point exactly the mind emerged.The evolution of mind is usually explained in terms ofnatural selection:genetic variationsresponsible for new or improved mental capacities, like better perception or social dispositions, have an increased chance of being passed on to future generations if they are beneficial tosurvival and reproduction.

Minimal forms of information processing are already found in the earliest forms of life 4 to 3.5 billion years ago, like the abilities ofbacteriaandeukaryoticunicellular organismsto sense the environment, store this information, and react to it.Nerve cellsemerged with the development ofmulticellular organismsmore than 600 million years ago as a way to process and transmit information. About 600 to 550 million years ago, an evolutionary bifurcation happened into radially symmetric organismswith ring-shaped nervous systems or anerve net,likejellyfish,and organisms withbilaterally symmetric bodies,whose nervous systems tend to be more centralized. About 540 million years ago, the bilaterally organized organisms separated intoinvertebratesandvertebrates.All vertebrates, like birds andmammals,have acentral nervous systemincluding a complex brain with specialized functions while invertebrates, likeclamsandinsects,either have no brains or tend to have simple brains.With the evolution of vertebrates, their brains tended to grow and the specialization of the different brain areas tended to increase. These developments are closely related to changes in limb structures, sense organs, and living conditions with a close correspondence between the size of a brain area and the importance of its function to the organism.An important step in the evolution of mammals about 200 million years ago was the development of theneocortex,which is responsible for many higher-order brain functions.

The size of the brain relative to the body further increased with the development ofprimates,like monkeys, about 65 million years ago and later with the emergence of the firsthomininsabout 7–5 million years ago.Anatomically modern humansappeared about 300,000 to 200,000 years ago.Various theories of the evolutionary processes responsible forhuman intelligencehave been proposed. The social intelligence hypothesis says that the evolution of the human mind was triggered by the increased importance of social life and its emphasis on mental abilities associated withempathy,knowledge transfer,andmeta-cognition.According to the ecological intelligence hypothesis, the main value of the increased mental capacities comes from their advantages in dealing with a complex physical environment through processes like behavioral flexibility, learning, and tool use. Other suggested mechanisms include the effects of a changed diet with energy-rich food and general benefits from an increased speed and efficiency of information processing.

Individual

Besides the development of mind in general in the course of history, there is also thedevelopment of individual human minds.Some of the individual changes vary from person to person as a form of learning from experience, like forming specific memories or acquiring particular behavioral patterns. Others are more universal developments as psychological stages that all or most humans go through as they pass throughearly childhood,adolescence,adulthood,andold age.These developments cover various areas, including intellectual, sensorimotor, linguistic, emotional, social, and moral developments.Some factors affect the development of mind before birth, such as nutrition, maternal stress, and exposure to harmful substances like alcohol during pregnancy.

Early childhood is marked by rapid developments asinfantslearn voluntary control over their bodies and interact with their environment on a basic level. Typically after about one year, this covers abilities like walking, recognizing familiar faces, and producing individual words.On the emotional and social levels, they develop attachments with their primary caretakers and express emotions ranging from joy to anger, fear, and surprise.Aninfluential theorybyJean Piagetdivides the cognitive development of children into four stages. The sensorimotor stage from birth until two years is concerned with sensory impressions and motor activities while learning that objects remain in existence even when not observed. In the preoperational stage until seven years, children learn to interpret and use symbols in an intuitive manner. They start employinglogical reasoningto physical objects in the concrete operational stage until eleven years and extend this capacity in the following formal operational stage to abstract ideas as well as probabilities and possibilities.Other important processes shaping the mind in this period aresocializationandenculturation,at first through primary caretakers and later through peers and the schooling system.

Psychological changes during adolescence are provoked both by physiological changes and being confronted with a different social situation and new expectations from others. An important factor in this period is change to theself-concept,which can take the form of anidentity crisis.This process often involves developing individuality and independence from parents while at the same time seeking closeness and conformity with friends and peers. Further developments in this period include improvements to the reasoning ability and the formation of a principled moral viewpoint.

The mind also changes during adulthood but in a less rapid and pronounced manner. Reasoning and problem-solving skills improve during early and middle adulthood. Some people experience the mid-life transition as amidlife crisisinvolving an inner conflict aboutpersonal identity,often associated with anxiety, a sense of lack of accomplishments in life, and an awareness of mortality. Intellectual faculties tend to decline in later adulthood, specifically the ability to learn complex unfamiliar tasks and later also the ability to remember, while people tend to become more inward-looking and cautious.

Non-human

Animal

It is commonly acknowledged today that animals have some form of mind, but it is controversial to which animals this applies and how their mind differs from the human mind.Different conceptions of the mind lead to different responses to this problem; when understood in a very wide sense as the capacity to process information, the mind is present in all forms of life, including insects, plants, and individual cells;on the other side of the spectrum are views that deny the existence of mentality in most or all non-human animals based on the idea that they lack key mental capacities, like abstractrationalityand symbolic language.The status ofanimal mindsis highly relevant to the field ofethicssince it affects the treatment of animals, including the topic ofanimal rights.

Discontinuity views state that the minds of non-human animals are fundamentally different from human minds and often point to higher mental faculties, like thinking, reasoning, and decision-making based on beliefs and desires.This outlook is reflected in the traditionally influential position of defining humans as "rational animals"as opposed to all other animals.Continuity views, by contrast, emphasize similarities and see the increased human mental capacities as a matter of degree rather than kind. Central considerations for this position are the shared evolutionary origin, organic similarities on the level of brain and nervous system, and observable behavior, ranging from problem-solving skills,animal communication,and reactions to and expressions of pain and pleasure. Of particular importance are the questions of consciousness andsentience,that is, to what extent non-human animals have a subjective experience of the world and are capable of suffering and feeling joy.

Artificial

Main article:Philosophy of artificial intelligence

TheTuring testaims to determine whether a computer can imitate human linguistic behavior to the degree that it is not possible to tell the difference between human and computer.

Some of the difficulties of assessing animal minds are also reflected in the topic of artificial minds, that is, the question of whether computer systems implementingartificial intelligenceshould be considered a form of mind.This idea is consistent with some theories of the nature of mind, such as functionalism and its idea that mental concepts describe functional roles, which are implemented by biological brains but could in principle also be implemented by artificial devices.TheTuring testis a traditionally influential procedure to test artificial intelligence: a person exchanges messages with two parties, one of them a human and the other a computer. The computer passes the test if it is not possible to reliably tell which party is the human and which one is the computer. While there are computer programs today that may pass the Turing test, this alone is usually not accepted as conclusive proof of mindedness.For other aspects of mind, it is more controversial whether computers can, in principle, implement them, such as desires, feelings, consciousness, and free will.

This problem is often discussed through the contrast betweenweakand strong artificial intelligence. Weak or narrow artificial intelligence is limited to specific mental capacities or functions. It focuses on a particular task or a narrow set of tasks, likeautonomous driving,speech recognition,ortheorem proving.The goal of strong AI, also termedartificial general intelligence,is to create a complete artificial person that has all the mental capacities of humans, including consciousness, emotion, and reason.It is controversial whether strong AI is possible; influential arguments against it includeJohn Searle'sChinese Room ArgumentandHubert Dreyfus's critique based onHeideggerianphilosophy.

Mental health and disorder

Main articles:Mental health,Mental disorder,andPsychopathology

Mental health is a state of mind characterized by internal equilibrium andwell-beingin which mental capacities function as they should. Some theorists emphasize positive features such as the abilities of a person to realize their potential, express and modulate emotions, cope with adverse life situations, and fulfill their social role. Negative definitions, by contrast, see mental health as the absence of mental illness in the form ofmental disorders.Mental disorders are abnormal patterns of thought, emotion, or behavior that deviate not only from how a mental capacity works on average but from the norm of how it should work while usually causing some form ofdistress.The content of those norms is controversial and there are differences from culture to culture; for example,homosexualitywas historically considered a mental disorder by medical professionals, a view which only changed in the late 20th century.

Obsessive–compulsive disorderis a mental disorder in which a person followscompulsive rituals,like excessive hand washing, to alleviateanxietycaused byintrusive thoughts.

There is a great variety of mental disorders, each associated with a different form of malfunctioning.Anxiety disordersinvolve intense and persistent fear that is disproportionate to the actual threat and significantly impairs everyday life, likesocial phobias,which involve irrational fear of certain social situations. Anxiety disorders also includeobsessive–compulsive disorder,for which theanxietymanifests in the form ofintrusive thoughtsthat the person tries to alleviate by followingcompulsive rituals.Mood disorderscause intensive moods or mood swings that are inconsistent with the external circumstances and can last for extensive periods. For instance, people affected bybipolar disorderexperience extreme mood swings betweenmanic statesof euphoria anddepressive statesof hopelessness.Personality disordersare characterized by enduring patterns ofmaladaptivebehavior that significantly impair regular life, likeparanoid personality disorder,which leads people to be deeply suspicious of the motives of others without rational basis.Psychotic disordersare among the most severe mental illnesses and involve a distorted relation to reality in the form ofhallucinationsanddelusions,as seen inschizophrenia.Other disorders includedissociative disordersandeating disorders.

There are different approaches to treating mental disorders and the most appropriate treatment usually depends on factors like the type of disorder, its cause, and the person's general condition.Psychotherapeutic methodsuse personal interaction with a therapist to understand the disorder and help the patient change their patterns of thinking, feeling, and acting.Psychoanalysisconceives the source of mental disorders as a conflict between the conscious and the unconscious mind. The therapeutic aim is to gain insight into unconscious conflicts to resolve them.Cognitive behavioral therapyalso focuses on insight but gives more emphasis to conscious mental phenomena to identify and change irrational beliefs and negative thought patterns.Behavior therapyis a related approach that relies onclassical conditioningto unlearn harmful behaviors rather than alter thought patterns.Humanistic therapiestry to help people gain insight into theirself-worthand empower them to resolve their problems and discover their potential.Drug therapiesuse medication to alter the brain chemistry involved in the disorder through substances likeantidepressants,antipsychotics,mood stabilizers,andanxiolytics.They fall into the domain ofpsychiatryand are sometimes used in combination with psychotherapeutic methods.

Fields and methods of inquiry

Various fields of inquiry study the mind, including psychology, neuroscience, philosophy, and cognitive science. They differ from each other in the aspects of mind they investigate and themethodsthey employ in the process.The study of the mind poses various problems since it is difficult to directly examine, manipulate, and measure it. Trying to circumvent this problem by investigating the brain comes with new challenges of its own, mainly because of the brain's complexity as a neural network consisting of billions of neurons, each with up to 10,000 links to other neurons.

Psychology

Main article:Psychology

Psychology is the scientific study of mind and behavior. It investigates conscious and unconscious mental phenomena, including perception, memory, feeling, thought, decision,intelligence,andpersonality.It is further interested in their outward manifestation in the form of observable behavioral patterns and how these patterns depend on external circumstances and are shaped by learning.Psychology is a wide discipline that includes many subfields.Cognitive psychologyis interested in higher-order mental activities like thinking, problem-solving, reasoning, and concept formation.Biological psychologyseeks to understand the underlying mechanisms on the physiological level and how they depend on genetic transmission and the environment.Developmental psychologystudies the development of the mind from childhood to old age whilesocial psychologyexamines the influence of social contexts on mind and behavior.Further subfields includecomparative,clinical,educational,occupational,andneuropsychology.

Psychologists use a great variety of methods to study the mind. Experimental approaches set up a controlled situation, either in the laboratory or the field, in which they modifyindependent variablesand measure their effects ondependent variables.This approach makes it possible to identifycausal relationsbetween the variables. For example, to determine whether people with similar interests (independent variable) are more likely to become friends (dependent variables), participants of a study could be paired with either similar or dissimilar participants. After giving the pairs time to interact, it is assessed whether the members of similar pairs have more positive attitudes toward one another than the members of dissimilar pairs.

Correlationalmethods examine the strength of association between two variables without establishing a causal relationship between them.Thesurvey methodpresents participants with a list of questions aimed at eliciting information about their mental attitudes, behavior, and other relevant factors. It analyzes how participants respond to questions and how answers to different questions correlate with one another.Surveys usually have a large number of participants in contrast tocase studies,which focus on an in-depth examination of a single subject or a small group of subjects, often to examine rare phenomena or explore new fields.Further methods includelongitudinal studies,naturalistic observation,andphenomenologicaldescription of experience.

Neuroscience

Main article:Neuroscience

Functional magnetic resonance imagingis a neuroimaging technique to detect brain areas with increased neural activity (shown in orange).

Neuroscience is the study of thenervous system.Its primary focus is thecentral nervous systemand the brain in particular, but it also investigates theperipheral nervous systemmainly responsible for connecting the central nervous system to the limbs and organs. Neuroscience examines the implementation of mental phenomena on a physiological basis. It covers various levels of analysis; on the small scale, it studies the molecular and cellular basis of the mind, dealing with the constitution of and interaction between individual neurons; on the large scale, it analyzes the architecture of the brain as a whole and its division into regions with different functions.

Neuroimagingtechniques are of particular importance as the main research methods of neuroscientists.Functional magnetic resonance imaging(fMRI) measures changes in themagnetic fieldof the brain associated with blood flow. Areas of increased blood flow indicate that the corresponding brain region is particularly active.Positron emission tomography(PET) uses radioactive substances to detect a range ofmetabolic changesin the brain.Electroencephalography(EEG) measures the electrical activity of the brain, usually by placingelectrodeson the scalp and measuring the voltage differences between them. These techniques are often employed to measure brain changes under particular circumstances, for example, while engaged in a specific cognitive task. Important insights are also gained from patients andlaboratory animalswithbrain damagein particular areas to assess the function of the damaged area and how its absence affects the remaining brain.

Philosophy

Main article:Philosophy of mind

Philosophy of mind examines the nature of mental phenomena and their relation to the physical world. It seeks to understand the "mark of the mental", that is, the features that all mental states have in common. It further investigates the essence of different types of mental phenomena, such asbeliefs,desires,emotions,intentionality,and consciousness while exploring how they are related to one another. Philosophy of mind also examines solutions to the mind–body problem, like dualism, idealism, and physicalism, and assesses arguments for and against them. Further topics arepersonal identityandfree will.

Philosophers use thought experiments to explore the nature of the mind and its relation to matter, for example, by imagining how abrain in a vatwould experience reality if a supercomputer fed it the same electrical stimulation a normal brain receives.

While philosophers of mind also include empirical considerations in their inquiry, they differ from fields like psychology and neuroscience by giving significantly more emphasis to non-empirical forms of inquiry. One such method isconceptual analysis,which aims to clarify the meaning of concepts, likemindandintention,by decomposing them to identify their semantic parts.Thought experimentsare often used to evokeintuitionsabout abstract theories to assess their coherence and plausibility: philosophers imagine a situation relevant to a theory and employcounterfactual thinkingto assess the possible consequences of this theory, as inMary the color scientist,philosophical zombies,andbrain in a vat-scenarios.Because of the subjective nature of the mind, thephenomenological methodis also commonly used to analyze the structure of consciousness by describing experience from the first-person perspective.

Cognitive science

Main article:Cognitive science

Cognitive science is the interdisciplinary study of mental processes. It aims to overcome the challenge of understanding something as complex as the mind by integrating research from diverse fields ranging from psychology and neuroscience to philosophy,linguistics,andartificial intelligence.Unlike these disciplines, it is not a unified field but a collaborative effort. One difficulty in synthesizing their insights is that each of these disciplines explores the mind from a different perspective and level of abstraction while using different research methods to arrive at its conclusion.

Cognitive science aims to overcome this difficulty by relying on a unified conceptualization of minds asinformation processors.This means that mental processes are understood as computations that retrieve, transform, store, and transmit information.For example, perception retrieves sensory information from the environment and transforms it to extract meaningful patterns that can be used in other mental processes, such as planning and decision-making.Cognitive science relies on different levels of description to analyze cognitive processes; the most abstract level focuses on the basic problem the process is supposed to solve and the reasons why the organism needs to solve it; the intermediate level seeks to uncover thealgorithmas a formal step-by-step procedure to solve the problem; the most concrete level asks how the algorithm isimplementedthrough physiological changes on the level of the brain.Another methodology to deal with the complexity of the mind is to analyze the mind as a complex system composed of individual subsystems that can be studied independently of one another.

Relation to other fields

The mind is relevant to many fields. Inepistemology,theproblem of other mindsis the challenge of explaining how it is possible to know that people other than oneself have a mind. The difficulty arises from the fact that people directly experience their own minds but do not have the same access to the minds of others. According to a common view, it is necessary to rely on perception to observe the behavior of others and then infer that they have a mind based onanalogicalorabductive reasoning.Closely related to this problem istheory of mindin psychology, which is the ability to understand that other people possess beliefs, desires, intentions, and feelings that may differ from one's own.

Anthropologyis interested in how different cultures conceptualize the nature of mind and its relation to the world. These conceptualizations affect the way people understand themselves, experience illness, and interpret ritualistic practices as attempts to commune withspirits.Some cultures do not draw a strict boundary between mind and world by allowing that thoughts can pass directly into the world and manifest as beneficial or harmful forces. Others strictly separate the mind as an internal phenomenon without supernatural powers from external reality.Sociologyis a related field concerned with the connections between mind, society, and behavior.

The concept of mind plays a central role in various religions.Buddhistssay that there is noenduring selfunderlying mental activity and analyze the mind as a stream of constantly changing experiences characterized byfive aspects or "aggregates":material form,feelings,perception,volition,andconsciousness.Hindus,by contrast, affirm the existence of apermanent self.In an influential analogy, the human mind is compared to a horse-drawn chariot: the horses are thesenses,which lure the sense mind corresponding to the reins through sensual pleasures but are controlled by the charioteer embodying theintellectwhile the self is a passenger.In traditionalChristian philosophy,mind and soul are closely intertwined as the immaterial aspect of humans that maysurvive bodily death.Islamic thought distinguishes between themind,spirit,heart,andselfas interconnected aspects of the spiritual dimension of humans.DaoismandConfucianismuse the concept ofheart-mindas the center of cognitive and emotional life, encompassing thought, understanding, will, desire, and mood.

In the field ofeducation,the minds of students are shaped through the transmission of knowledge, skills, and character traits as a process of socialization and enculturation. This is achieved through differentteaching methodsincluding the contrast between group work and individual learning and the use of instructional media.Teacher-centered education positions the teacher as the central authority controlling the learning process whereas instudent-centered education,students have a more active role in shaping classroom activities.The choice of the most effective method to develop the minds of the learners is determined by various factors, including the topic and the learner's age and skill level.

Phrenologywas a pseudoscientific attempt to correlate mental functions to brain areas.

The mind is a frequent subject ofpseudoscientificinquiry.Phrenologywas an early attempt to correlate mental functions with specific brain areas. While its central claims about predicting mental traits by measuring bumps on the skull did not survive scientific scrutiny, the underlying idea that certain mental functions are localized in particular regions of the brain is now widely accepted.Parapsychologistsseek to discover and studyparanormalmental abilities ranging fromclairvoyancetotelepathyandtelekinesis.

See also

• Conscience
• Embodied cognition
• Explanatory gap
• Ideasthesia
• Mental energy
• Mind at Large
• Neural Darwinism
• Outline of human intelligence
• Outline of thought
• Subjective character of experience

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