The question of “Are faces special?” has essentially referred to whether there are unique visual mechanisms for processing identity-related information in faces as compared to other objects. Faces provide unique information about expression, gaze direction, identity, and visual cues to speech. In the literature, however, the debate about whether “faces are special” has referred to the specific question of whether there are special visual processing mechanisms unique to faces, presumably deriving from the social importance of faces and developed either across (...) the course of evolution or the course of childhood. This article provides historical background to the question and presents key theoretical findings and key methodological findings. It reviews literature on an evolved face representation, including studies of newborns, face-deprived monkeys and twins; on configural behavioral processing in object experts; and on neural processing in object novices and object experts including single-unit recording, fMRI, ERPs, TMS, and neuropsychological studies. (shrink)

Perceptual learning can be defined as practice-induced improvement in the ability to perform specific perceptual tasks. We previously proposed the Reverse Hierarchy Theory as a unifying concept that links behavioral findings of visual learning with physiological and anatomical data. Essentially, it asserts that learning is a top-down guided process, which begins at high-level areas of the visual system, and when these do not suffice, progresses backwards to the input levels, which have a better signal-to-noise ratio. This simple concept has proved (...) powerful in explaining a broad range of findings, including seemingly contradicting data. We now extend this concept to describe the dynamics of skill acquisition and interpret recent behavioral and electrophysiological findings. (shrink)