Epiphenomenalism

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Epiphenomenalism is a position on the mind–body problem which holds that physical and biochemical events within the human body (sense organs, neural impulses, and muscle contractions, for example) are causal with respect to mental events (thought, consciousness, and cognition). According to this view, subjective mental events are completely dependent for their existence on corresponding physical and biochemical events within the human body and themselves have no causal efficacy on physical events. The appearance that subjective mental states (such as intentions) influence physical events is merely an illusion. For instance, fear seems to make the heart beat faster, but according to epiphenomenalism the biochemical secretions of the brain and nervous system (such as adrenaline)—not the experience of fear—is what raises the heartbeat. [1] Because mental events are a kind of overflow that cannot cause anything physical, yet have non-physical properties, epiphenomenalism is viewed as a form of property dualism.

Mind–body problem open question in philosophy of how abstract minds interact with physical bodies

The mind–body problem is a philosophical problem concerning the relationship between thought and consciousness in the human mind, and the brain as part of the physical body. It is distinct from the question of how mind and body function chemically and physiologically since that question presupposes an interactionist account of mind-body relations. This question arises when mind and body are considered as distinct, based on the premise that the mind and the body are fundamentally different in nature.

Biochemistry study of chemical processes in living organisms

Biochemistry, sometimes called biological chemistry, is the study of chemical processes within and relating to living organisms. Biochemical processes give rise to the complexity of life.

Sensory nervous system Part of the nervous system responsible for processing sensory information

The sensory nervous system is a part of the nervous system responsible for processing sensory information. A sensory system consists of sensory neurons, neural pathways, and parts of the brain involved in sensory perception. Commonly recognized sensory systems are those for vision, hearing, touch, taste, smell, and balance. In short, senses are transducers from the physical world to the realm of the mind where we interpret the information, creating our perception of the world around us.

Contents

Development

During the seventeenth century, Rene Descartes argued that animals are subject to mechanical laws of nature. He defended the idea of automatic behavior, or the performance of actions without conscious thought. Descartes questioned how the immaterial mind and the material body can interact causally. [1] His interactionist model (1649) held that the body relates to the mind through the pineal gland. [2] La Mettrie, Leibniz, and Spinoza all in their own way began this way of thinking. The idea that even if the animal were conscious nothing would be added to the production of behavior, even in animals of the human type, was first voiced by La Mettrie (1745), and then by Cabanis (1802), and was further explicated by Hodgson (1870) [3] and Huxley (1874). [4] [5]

Automatic behavior, from the Greek automatos or self-acting, is the spontaneous production of often purposeless verbal or motor behavior without conscious self-control or self-censorship. This condition can be observed in a variety of contexts, including schizophrenia, psychogenic fugue, epilepsy, narcolepsy or in response to a traumatic event. The individual does not recall the behavior. According to the book 'The Mind Machine' by Colin Blakemore, hypoglycemia usually leads quickly to unconsciousness, but as blood glucose level falls, there is 'a window of experience between sanity and coma in which self-control is lost', and the body 'behaves on its own'.

Julien Offray de La Mettrie French physician and philosopher

Julien Offray de La Mettrie was a French physician and philosopher, and one of the earliest of the French materialists of the Enlightenment. He is best known for his work L'homme machine.

Baruch Spinoza Dutch philosopher

Baruch Spinoza was a Jewish-Dutch philosopher of Portuguese Sephardi origin. One of the early thinkers of the Enlightenment and modern biblical criticism, including modern conceptions of the self and the universe, he came to be considered one of the great rationalists of 17th-century philosophy. Inspired by the groundbreaking ideas of René Descartes, Spinoza became a leading philosophical figure of the Dutch Golden Age. Spinoza's given name, which means "Blessed", varies among different languages. In Hebrew, it is written ברוך שפינוזה. His Portuguese name is Benedito "Bento" de Espinosa or d'Espinosa. In his Latin works, he used Latin: Benedictus de Spinoza.

Thomas Henry Huxley agreed with Descartes that behavior is determined solely by physical mechanisms, but he also believed that humans enjoy an intelligent life. In 1874, Huxley argued, in the Presidential Address to the British Association for the Advancement of Science, that animals are conscious automata. Huxley proposed that psychical changes are collateral products of physical changes. He termed the stream of consciousness an "epiphenomenon;" like the bell of a clock that has no role in keeping the time, consciousness has no role in determining behavior. [1] [2]

The British Science Association (BSA) is a charity and learned society founded in 1831 to aid in the promotion and development of science. Until 2009 it was known as the British Association for the Advancement of Science (BA). The Chief Executive is Katherine Mathieson. The British Science Association's mission is to get more people engaged in the field of science by coordinating, delivering, and overseeing different projects that are suited to achieve these goals. The British Science Association envisions a society in which a diverse group of people can learn and apply the sciences in which they learn. The British Science Association is managed by a professional staff located at their Head Office at the Wellcome Wolfson Building along with four regional staff across the UK. The British Science Association offers a wide variety of activities and events that both recognize and encourage people to be involved in science. These include the British Science Festival, British Science Week, the CREST Awards, Huxley Summit, Youth Pannel, Media Fellowships Scheme, along with regional and local events.

Conscious automatism (C.A.) is a position on the philosophic question that asks whether determinism, as distinguished from “free will”, can be considered the sole operant principle in human decision making.

Huxley defended automatism by testing reflex actions, originally supported by Descartes. Huxley hypothesized that frogs that undergo lobotomy would swim when thrown into water, despite being unable to initiate actions. He argued that the ability to swim was solely dependent on the molecular change in the brain, concluding that consciousness is not necessary for reflex actions. According to epiphenomenalism, animals experience pain only as a result of neurophysiology. [1] [2]

Neurophysiology is a branch of physiology and neuroscience that is concerned with the study of the functioning of the nervous system. The primary tools of basic neurophysiological research include electrophysiological recordings, such as patch clamp, voltage clamp, extracellular single-unit recording and recording of local field potentials, as well as some of the methods of calcium imaging, optogenetics, and molecular biology.

In 1870, Huxley conducted a case study on a French soldier who had sustained a shot in the Franco-Prussian War that fractured his left parietal bone. Every few weeks the soldier would enter a trance-like state, smoking, dressing himself, and aiming his cane like a rifle all while being insensitive to pins, electric shocks, odorous substances, vinegar, noise, and certain light conditions. Huxley used this study to show that consciousness was not necessary to execute these purposeful actions, justifying the assumption that humans are insensible machines. Huxley's mechanistic attitude towards the body convinced him that the brain alone causes behavior. [1] [2]

In the early 1900s scientific behaviorists such as Ivan Pavlov, John B. Watson, and B. F. Skinner began the attempt to uncover laws describing the relationship between stimuli and responses, without reference to inner mental phenomena. Instead of adopting a form of eliminativism or mental fictionalism, positions that deny that inner mental phenomena exist, a behaviorist was able to adopt epiphenomenalism in order to allow for the existence of mind. George Santayana (1905) believed that all motion has merely physical causes. Because consciousness is accessory to life and not essential to it, natural selection is responsible for ingraining tendencies to avoid certain contingencies without any conscious achievement involved. [6] By the 1960s, scientific behaviourism met substantial difficulties and eventually gave way to the cognitive revolution. Participants in that revolution, such as Jerry Fodor, reject epiphenomenalism and insist upon the efficacy of the mind. Fodor even speaks of "epiphobia"—fear that one is becoming an epiphenomenalist.

Behaviorism is a systematic approach to understanding the behavior of humans and other animals. It assumes that all behaviors are either reflexes produced by a response to certain stimuli in the environment, or a consequence of that individual's history, including especially reinforcement and punishment, together with the individual's current motivational state and controlling stimuli. Although behaviorists generally accept the important role of inheritance in determining behavior, they focus primarily on environmental factors.

Ivan Pavlov Russian physiologist

Ivan Petrovich Pavlov was a Russian physiologist known primarily for his work in classical conditioning.

John B. Watson American psychologist

John Broadus Watson was an American psychologist who established the psychological school of behaviorism. Watson promoted a change in psychology through his address Psychology as the Behaviorist Views it, which was given at Columbia University in 1913. Through his behaviorist approach, Watson conducted research on animal behavior, child rearing, and advertising. In addition, he conducted the controversial "Little Albert" experiment and the Kerplunk experiment. Watson popularized the use of the scientific theory with behaviorism. He was also editor of Psychological Review from 1910 to 1915. A Review of General Psychology survey, published in 2002, ranked Watson as the 17th most cited psychologist of the 20th century.

However, since the cognitive revolution, there have been several who have argued for a version of epiphenomenalism. In 1970, Keith Campbell proposed his "new epiphenomenalism", which states that the body produces a spiritual mind that does not act on the body. How the brain causes a spiritual mind, according to Campbell, is destined to remain beyond our understanding forever (see New Mysterianism). [7] In 2001, David Chalmers and Frank Jackson argued that claims about conscious states should be deduced a priori from claims about physical states alone. They offered that epiphenomenalism bridges, but does not close, the explanatory gap between the physical and the phenomenal realms. [8] These more recent versions maintain that only the subjective, qualitative aspects of mental states are epiphenomenal. Imagine both Pierre and a robot eating a cupcake. Unlike the robot, Pierre is conscious of eating the cupcake while the behavior is under way. This subjective experience is often called a quale (plural qualia), and it describes the private "raw feel" or the subjective "what-it-is-like" that is the inner accompaniment of many mental states. Thus, while Pierre and the robot are both doing the same thing, only Pierre has the inner conscious experience.

Frank Jackson (1982), for example, once espoused the following view:

I am what is sometimes known as a "qualia freak". I think that there are certain features of bodily sensations especially, but also of certain perceptual experiences, which no amount of purely physical information includes. Tell me everything physical there is to tell about what is going on in a living brain... you won't have told me about the hurtfulness of pains, the itchiness of itches, pangs of jealousy.... [9]

According to epiphenomenalism, mental states like Pierre's pleasurable experience—or, at any rate, their distinctive qualia—are epiphenomena; they are side-effects or by-products of physical processes in the body. If Pierre takes a second bite, it is not caused by his pleasure from the first; If Pierre says, "That was good, so I will take another bite", his speech act is not caused by the preceding pleasure. The conscious experiences that accompany brain processes are causally impotent. The mind might simply be a byproduct of other properties such as brain size or pathway activation synchronicity, which are adaptive.

Some thinkers draw distinctions between different varieties of epiphenomenalism. In Consciousness Explained , Daniel Dennett distinguishes between a purely metaphysical sense of epiphenomenalism, in which the epiphenomenon has no causal impact at all, and Huxley's "steam whistle" epiphenomenalism, in which effects exist but are not functionally relevant.

Arguments for

A large body of neurophysiological data seems to support epiphenomenalism. Some of the oldest such data is the Bereitschaftspotential or "readiness potential" in which electrical activity related to voluntary actions can be recorded up to two seconds before the subject is aware of making a decision to perform the action. More recently Benjamin Libet et al. (1979) have shown that it can take 0.5 seconds before a stimulus becomes part of conscious experience even though subjects can respond to the stimulus in reaction time tests within 200 milliseconds. The conclusions of this experiment have begun to receive some backlash and criticism, mainly by neuroscientists such as Peter Tse, who claim to show that the readiness potential has nothing to do with consciousness at all. [10] Recent research on the Event Related Potential also shows that conscious experience does not occur until the late phase of the potential (P3 or later) that occurs 300 milliseconds or more after the event. In Bregman's auditory continuity illusion, where a pure tone is followed by broadband noise and the noise is followed by the same pure tone it seems as if the tone occurs throughout the period of noise. This also suggests a delay for processing data before conscious experience occurs. Popular science author Tor Nørretranders has called the delay the "user illusion", implying that we only have the illusion of conscious control, most actions being controlled automatically by non-conscious parts of the brain with the conscious mind relegated to the role of spectator.

The scientific data seem to support the idea that conscious experience is created by non-conscious processes in the brain (i.e., there is subliminal processing that becomes conscious experience). These results have been interpreted to suggest that people are capable of action before conscious experience of the decision to act occurs. Some argue that this supports epiphenomenalism, since it shows that the feeling of making a decision to act is actually an epiphenomenon; the action happens before the decision, so the decision did not cause the action to occur.

Arguments against

The most powerful argument against epiphenomenalism is that it is self-contradictory: if we have knowledge about epiphenomenalism, then our brains know about the existence of the mind, but if epiphenomenalism were correct, then our brains should not have any knowledge about the mind, because the mind does not affect anything physical. [11]

However, some philosophers do not accept this as a rigorous refutation. For example, Victor Argonov states that epiphenomenalism is a questionable, but experimentally falsifiable theory. He argues that the personal mind is not the only source of knowledge about the existence of mind in the world. A creature (even a zombie) could have knowledge about mind and the mind-body problem by virtue of some innate knowledge. [12] The information about mind (and its problematic properties such as qualia) could have been, in principle, implicitly "written" in the material world since its creation. Epiphenomenalists can say that God created immaterial mind and a detailed "program" of material human behavior that makes it possible to speak about the mind–body problem. That version of epiphenomenalism seems highly exotic, but it cannot be excluded from consideration by pure theory. However, Argonov suggests that experiments could refute epiphenomenalism. In particular, epiphenomenalism could be refuted if neural correlates of consciousness can be found in the human brain, and it is proven that human speech about consciousness is caused by them.

Some philosophers, such as Dennett, reject both epiphenomenalism and the existence of qualia with the same charge that Gilbert Ryle leveled against a Cartesian "ghost in the machine", that they too are category mistakes. A quale or conscious experience would not belong to the category of objects of reference on this account, but rather to the category of ways of doing things.

Functionalists assert that mental states are well described by their overall role, their activity in relation to the organism as a whole. "This doctrine is rooted in Aristotle's conception of the soul, and has antecedents in Hobbes's conception of the mind as a 'calculating machine', but it has become fully articulated (and popularly endorsed) only in the last third of the 20th century." [13] In so far as it mediates stimulus and response, a mental function is analogous to a program that processes input/output in automata theory. In principle, multiple realisability would guarantee platform dependencies can be avoided, whether in terms of hardware and operating system or, ex hypothesi, biology and philosophy. Because a high-level language is a practical requirement for developing the most complex programs, functionalism implies that a non-reductive physicalism would offer a similar advantage over a strictly eliminative materialism.

Eliminative materialists believe "folk psychology" is so unscientific that, ultimately, it will be better to eliminate primitive concepts such as mind,desire and belief, in favor of a future neuro-scientific account. A more moderate position such as J. L. Mackie's error theory suggests that false beliefs should be stripped away from a mental concept without eliminating the concept itself, the legitimate core meaning being left intact.

Benjamin Libet's results are quoted [14] in favor of epiphenomenalism, but he believes subjects still have a "conscious veto", since the readiness potential does not invariably lead to an action. In Freedom Evolves , Daniel Dennett argues that a no-free-will conclusion is based on dubious assumptions about the location of consciousness, as well as questioning the accuracy and interpretation of Libet's results. [15] Similar criticism of Libet-style research has been made by neuroscientist Adina Roskies and cognitive theorists Tim Bayne and Alfred Mele.

Others have argued that data such as the Bereitschaftspotential undermine epiphenomenalism for the same reason, that such experiments rely on a subject reporting the point in time at which a conscious experience and a conscious decision occurs, thus relying on the subject to be able to consciously perform an action. That ability would seem to be at odds with early epiphenomenalism, which according to Huxley is the broad claim that consciousness is "completely without any power… as the steam-whistle which accompanies the work of a locomotive engine is without influence upon its machinery". [16]

Adrian G. Guggisberg and Annaïs Mottaz have also challenged those findings. [17]

A study by Aaron Schurger and colleagues published in PNAS [18] challenged assumptions about the causal nature of the readiness potential itself (and the "pre-movement buildup" of neural activity in general), thus denying the conclusions drawn from studies such as Libet's [19] and Fried's. [20]

In favor of interactionism, Celia Green (2003) argues that epiphenomenalism does not even provide a satisfactory 'out' from the problem of interaction posed by substance dualism. Although it does not entail substance dualism, according to Green, epiphenomenalism implies a one-way form of interactionism that is just as hard to conceive of as the two-way form embodied in substance dualism. Green suggests the assumption that it is less of a problem may arise from the unexamined belief that physical events have some sort of primacy over mental ones.

Donald Symons dismisses epiphenomenalism from an evolutionary perspective. He says that the view that mind is an epiphenomenon of brain activity is not consistent with evolutionary theory, because if mind were functionless, it would have disappeared long ago, as it would not have been favoured by evolution. [21]

See also

Notes

  1. 1 2 3 4 5 Walter, Sven. "Epiphenomenalism". Internet Encyclopedia of Philosophy. University of Bielefeld. Archived from the original on 23 September 2013. Retrieved 10 October 2013.
  2. 1 2 3 4 Robinson, William. "Epiphenomenalism". In Zalta, Edward N. (ed.). The Stanford Encyclopedia of Philosophy. Retrieved 1 November 2013.
  3. Hodgson, Shadworth (1870). The Theory of Practice. London: Longmans, Green, Reader, & Dyer.
  4. Huxley, T. H. (1874). "On the Hypothesis that Animals are Automata, and its History", The Fortnightly Review, n.s.16:555-580. Reprinted in Method and Results: Essays by Thomas H. Huxley (New York: D. Appleton and Company, 1898)
  5. Gallagher, S. 2006. "Where's the action?: Epiphenomenalism and the problem of free will". In W. Banks, S. Pockett, and S. Gallagher. Does Consciousness Cause Behavior? An Investigation of the Nature of Intuition (109-124). Cambridge, Massachusetts: MIT Press.
  6. Scott, Alwyn (1995). Stairway to the Mind. New York, New York: Copernicus. p. 109. ISBN   9780387943817.
  7. Griffin, David (1998). Unsnarling the World-Knot. Berkeley, California: University of California Press. p. 5. ISBN   9781556357558.
  8. Polger, Thomas (2004). Natural Minds. Cambridge, Massachusetts: Massachusetts Institute of Technology. pp. 37–38. ISBN   9780262661966.
  9. Jackson, 1982, p. 127.
  10. https://www.dartmouth.edu/~peter/pdf/63.pdf
  11. Robinson, William (2015). "Epiphenomenalism". In Edward N. Zalta (ed.). The Stanford Encyclopedia of Philosophy (Fall 2015 ed.).
  12. Victor Argonov (2014). "Experimental Methods for Unraveling the Mind-body Problem: The Phenomenal Judgment Approach". Journal of Mind and Behavior. 35: 51–70. Archived from the original on 2016-10-20.CS1 maint: Uses authors parameter (link)
  13. Levin, Janet (2010). "Functionalism". In Edward N. Zalta (ed.). The Stanford Encyclopedia of Philosophy (Summer 2010 ed.).
  14. Wegner D., 2002. The Illusion of Conscious Will. Cambridge, Massachusetts: MIT Press.
  15. Dennett, Daniel. (2003) Freedom evolves.
  16. Flanagan, O.J. (1992). Consciousness Reconsidered. Bradford Books. MIT Press. p. 131. ISBN   978-0-262-56077-1. LCCN   lc92010057.
  17. Guggisberg, AG; Mottaz, A (2013). "Timing and awareness of movement decisions: does consciousness really come too late?". Front Hum Neurosci. 7: 385. doi:10.3389/fnhum.2013.00385. PMC   3746176 . PMID   23966921.
  18. Schurger, Aaron; Sitt, Jacobo D.; Dehaene, Stanislas (16 October 2012). "An accumulator model for spontaneous neural activity prior to self-initiated movement". Proceedings of the National Academy of Sciences. 109 (42): 16776–16777. Archived from the original on 30 October 2017. Retrieved 9 May 2018 via www.pnas.org.
  19. Libet, Benjamin; Gleason, Curtis A.; Wright, Elwood W.; Pearl, Dennis K. (1983). "Time of Conscious Intention to Act in Relation to Onset of Cerebral Activity (Readiness-Potential)". Brain. 106 (3): 623–42. doi:10.1093/brain/106.3.623. PMID   6640273.
  20. Fried, Itzhak; Mukamel, Roy; Kreiman, Gabriel (2011). "Internally Generated Preactivation of Single Neurons in Human Medial Frontal Cortex Predicts Volition". Neuron. 69 (3): 548–62. doi:10.1016/j.neuron.2010.11.045. PMC   3052770 . PMID   21315264.
  21. Symons, Donald. The evolution of human sexuality. Oxford University Press. 1979.

Further reading

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Mind–body dualism Philosophical theory that mental phenomena are non-physical and that matter exists independently of mind

Mind–body dualism, or mind–body duality, is a view in the philosophy of mind that mental phenomena are, in some respects, non-physical, or that the mind and body are distinct and separable. Thus, it encompasses a set of views about the relationship between mind and matter, and between subject and object, and is contrasted with other positions, such as physicalism and enactivism, in the mind–body problem.

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