We thus make a fundamental distinction between the competence (the speaker-hearer's knowledge of his language) and performance (the actual use of language in concrete situations).
(Noam Chomsky (b. 1928), U.S. mathematical linguist, philosopher, psychologist, political critic. Aspects of the Theory of Syntax, p. 3 (1965).
Drawing the author's key distinction for dismissing raw empirical data as providing direct counter-evidence to his linguistic theories of grammar.)
The computer takes up where psychoanalysis left off. It takes the ideas of a decentered self and makes it more concrete by modeling mind as a multiprocessing machine.
(Sherry Turkle (b. 1948), U.S. sociologist and psychologist. The Second Self, ch. 9 (1984).
Turkle was on the faculty of the Massachusetts Institute of Technology's program in Science, Technology and Society.)