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Annu Rev Neurosci. 2008;31:411-37. doi: 10.1146/annurev.neuro.30.051606.094238.

Mechanisms of face perception.

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1
Centers for Advanced Imaging and Cognitive Sciences, Bremen University, D-28334 Bremen, Germany. doris@nmr.mgh.harvard.edu

Abstract

Faces are among the most informative stimuli we ever perceive: Even a split-second glimpse of a person's face tells us his identity, sex, mood, age, race, and direction of attention. The specialness of face processing is acknowledged in the artificial vision community, where contests for face-recognition algorithms abound. Neurological evidence strongly implicates a dedicated machinery for face processing in the human brain to explain the double dissociability of face- and object-recognition deficits. Furthermore, recent evidence shows that macaques too have specialized neural machinery for processing faces. Here we propose a unifying hypothesis, deduced from computational, neurological, fMRI, and single-unit experiments: that what makes face processing special is that it is gated by an obligatory detection process. We clarify this idea in concrete algorithmic terms and show how it can explain a variety of phenomena associated with face processing.

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