There is a tendency in recent philosophy of cognitive science, best seen in the writings of Bechtel et al., to overstate the significance of mechanistic explanations and to neglect the explanatory role of principles.This paper is a plea for restoring the balance.It draws attention to the search for explaining the so-called basic level effects, one 2003 toyota corolla exhaust system of the most important empirical findings in the history of categorization research.The analysis of three different episodes from this history reveals that appeals pituitary gland in spanish to principles have played an important role in it.
However, in order to fully recognize the explanatory role of principles one should be ready to admit that the deductive-nomological explanations are not the only species of principle-based explanations.