Competence and the Classical Cascade: A Reply to Franks
نویسنده
چکیده
Marr's distinction between three levels of explanation of a computational system has become a familiar part of the methodology of cognitive science. Marr distinguishes between the top level of computational theory, the middle level of representation and algorithm, and the bottom level of hardware implementation, and claims that we understand an information-processing system completely only when we understand it at all three levels (Marr [1982], p. 24). This ordering from top to bottom reflects his conviction that understanding at the lower levels will be achieved through understanding at the higher levels, a vision Dennett conveys with the image of 'a triumphant cascade through Marr's levels' (Dennett [1987], p. 227).' In an article in this journal, Bradley Franks has argued that this cascade of explanation is blocked by various idealizations used in cognitive science, in particular those employed by competence theories of linguistic knowledge (Franks [1995], p. 476). He concludes that cognitive scientists face a dilemma: abandon idealizations (a tall order for any science), or abandon the possibility of achieving the cascade of explanation which would yield full understanding of a cognitive
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