Modulation of Face-sensitive Event-related Potentials by Canonical and Distorted Human Faces: The Role of Vertical Symmetry and Up-Down Featural Arrangement

Abstract

The study examined the sensitivity of early face-sensitive ERP components to the disruption of two structural properties embedded in faces, namely up-down featural arrangement and vertical asymmetry. Response times and ERPs were recorded as adults made an orientation judgment on canonical faces and distorted faces that had been manipulated for either or both of the mentioned properties. The P1, the N170 and the VPP allexhibited a similar linear increase in amplitude or latency as the properties were disrupted in the order of 1) up-down featural arrangement, 2) vertical symmetry, and 3) both up-down featural arrangement and vertical symmetry. Exceptions to this finding were seen for the amplitudes of the N170 and VPP, which were larger for the stimulus in which vertical symmetry was disrupted. Interestingly, the enhanced amplitudes of the N170 and VPP are consistent with impaired behavioral performance on the orientation judgment observed for this stimulus.