The effect of parametric stimulus size variation on individual face discrimination indexed by fast periodic visual stimulation.

ABSTRACT:

Background

The human brain is frequently exposed to individual faces across a wide range of different apparent sizes, often seen simultaneously (e.g., when facing a crowd). Here we used a sensitive and objective fast periodic visual stimulation approach while recording scalp electroencephalogram (EEG) to test the effect of size variation on neural responses reflecting individual face discrimination.

Methods

EEG was recorded in ten observers presented with the same face identity at a fixed rate (5.88 Hz, frequency F) and different oddball face identities appearing every five faces (F/5, i.e., 1.18 Hz). Stimulus size was either constant (6.5 × 4 degrees of visual angle) or changed randomly at each stimulation cycle, by 2:1 ratio increasing values from 10% to 80% size variation

SUBMITTER: Dzhelyova M 

PROVIDER: S-EPMC4112211 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature