Perception and Basic Beliefs is an engaging defence of a radical form of epistemological reliabilism. Drawing on modular theories of the mind, it aims to give a naturalistic account of basic beliefs and their justification, and ultimately provide a solution to the traditional problem of external world scepticism.

Central to Lyons’s project is a distinctive account of the distinction between basic and non-basic beliefs. This is intended to solve in tandem two recurring epistemological problems: the delineation problem of specifying which beliefs are basic, and the source problem of specifying in virtue of what basic beliefs are justified. Basic beliefs are identified as the outputs of inferentially opaque modules or primal systems; in the case of perception, for instance, the output of perceptual systems (where perceptual...

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