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Identity theory of mind : ウィキペディア英語版
Type physicalism

Type physicalism (also known as reductive materialism, type identity theory, mind-brain identity theory and identity theory of mind) is a physicalist theory, in the philosophy of mind. It asserts that mental events can be grouped into ''types'', and can then be correlated with types of physical events in the brain. For example, ''one type'' of mental event, such as "mental pains" will, presumably, turn out to be describing ''one type'' of physical event (like C-fiber firings).
Type physicalism is contrasted by token identity physicalism, which argues that mental events are unlikely to have "steady" or categorical biological correlates. These positions make use of the philosophical type–token distinction (e.g., Two persons having the same "type" of car need not mean that they share a "token", a single vehicle). Type physicalism can now be understood to argue that there is identicalness between types, whereas token identity physicalism says one can only describe a particular, unique, brain event.
There are other ways a physicalist might criticize type physicalism; eliminative materialism and revisionary materialism question whether science is currently using the best categorisations. In the same way talk of demonic possession was questioned with scientific advance, categorisations like "pain" may need to be revised.
==Background==
According to U.T. Place,〔Place, Ullin (1956). "Is Consciousness a Brain Process?". British Journal of Psychology〕 one of the popularizers of the idea of type-identity in the 1950s and 1960s, the idea of type-identity physicalism originated in the 1930s with the psychologist E. G. Boring and took nearly a quarter of a century to gain acceptance from the philosophical community. Boring, in a book entitled ''The Physical Dimensions of Consciousness'' (1933) wrote that:
To the author a perfect correlation is identity. Two events that always occur together at the same time in the same place, without any temporal or spatial differentiation at all, are not two events but the same event. The mind-body correlations as formulated at present, do not admit of spatial correlation, so they reduce to matters of simple correlation in time. The need for identification is no less urgent in this case (p. 16, quoted in Place ()).

The barrier to the acceptance of any such vision of the mind, according to Place, was that philosophers and logicians had not yet taken a substantial interest in questions of identity and referential identification in general. The dominant epistemology of the logical positivists at that time was phenomenalism, in the guise of the theory of sense-data. Indeed Boring himself subscribed to the phenomenalist creed, attempting to reconcile it with an identity theory and this resulted in a ''reductio ad absurdum'' of the identity theory, since brain states would have turned out, on this analysis, to be identical to colors, shapes, tones and other sensory experiences.
The revival of interest in the work of Gottlob Frege and his ideas of sense and reference on the part of Herbert Feigl and J.J.C. Smart, along with the discrediting of phenomenalism through the influence of the later Wittgenstein and J.L. Austin, led to a more tolerant climate toward physicalistic and realist ideas. Logical behaviorism emerged as a serious contender to take the place of the Cartesian "ghost in the machine" and, although not lasting very long as a dominant position on the mind/body problem, its elimination of the whole realm of internal mental events was strongly influential in the formation and acceptance of the thesis of type identity.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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