Abstract
Eyes are an indispensable communication medium for human social interactions. Although previous neuroscientific evidence suggests the activation of the inferior occipital gyrus (IOG) during eye processing, the temporal profile of this activation remains unclear. To investigate this issue, we analyzed intracranial electroencephalograms of the IOG during the presentation of eyes and mosaics, in either averted or straight directions. Time–frequency statistical parametric mapping analyses revealed greater gamma-band activation in the right IOG beginning at 114 ms in response to eyes relative to mosaics, irrespective of their averted or straight direction. These results suggest that gamma oscillations in the right IOG are involved in the early stages of eye processing, such as eye detection.
Highlights
Individual-level[2] No of participants were conducted for IOG activity in response to faces found face-related gamma-band activity beginning at 110 ms[10]
To examine the effect of eye direction, averted and straight directions were prepared for both the eyes and mosaic stimuli
Previous behavioral studies have found that dynamic changes of eye direction are more ecologically valid and powerful than static direction[27]
Summary
Individual-level[2] No of participants were conducted for IOG activity in response to faces found face-related gamma-band (higher than 30 Hz26) activity beginning at 110 ms[10]. Based on these data, we hypothesized that eye processing in the IOG may be initiated by gamma-band activity beginning at approximately 110 ms. We hypothesized that eye processing in the IOG may be initiated by gamma-band activity beginning at approximately 110 ms To test this hypothesis, we analyzed intracranial EEGs of the human IOG (Fig. 1) as the participants were presented with visual stimuli comprising only the eye region (Fig. 2). Because several lines of evidence revealed functional hemispheric differences during eye processing[29,30], the IOG was analyzed in both hemispheres
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