Аннотация
Behavioural studies have shown that picture-plane
inversion impacts face and object recognition
differently, thereby suggesting face-specific
processing mechanisms in the human brain. Here we used
event-related potentials to investigate the time course
of this behavioral inversion effect in both faces and
novel objects. ERPs were recorded for 14 subjects
presented with upright and inverted visual categories,
including human faces and novel objects (Greebles). A
N170 was obtained for all categories of stimuli,
including Greebles. However, only inverted faces
delayed and enhanced N170 (bilaterally). These
observations indicate that the N170 is not specific to
faces, as has been previously claimed. In addition, the
amplitude difference between faces and objects does not
reflect face-specific mechanisms since it can be
smaller than between non-face object categories. There
do exist some early differences in the time-course of
categorisation for faces and non-faces across
inversion. This may be attributed either to stimulus
category per se (e.g. face-specific mechanisms) or to
differences in the level of expertise between these
categories.
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