The ventral temporal electrophysiology of face-image processing

May 17, 2019 | 11:00 AM

Dr. Kai Miller, Mayo Clinic Rochester, UMC Utrecht, and Stanford Neurosurgery

We measured broadband electrocorticographic changes from implanted electrodes on the ventral temporal brain surface (electrocorticography) while showing patients images of faces and houses, first plainly visible, then noise-degraded. These electrical potentials from the ventral temporal cortical surface in humans contain sufficient information for spontaneous and near-instantaneous identification of a subject’s perception of face and house images, using a combination of broadband spectral changes and raw potential deflections. Noise-masked images allowed us to delineate regions of convergence of proportional and thresholded responses, revealing active areas where face percepts are extracted from simple visual features. These regions exist within a topological structure of face percept formation in the human ventral visual stream, preceded by category-nonselective activity in pericalcarine early visual areas and in concert with all-or-nothing activity in postperceptual subregions of the ventral temporal lobe. This topological organization suggests a physiological basis for the anatomy of face perception, explaining different perceptual deficits following temporal lobe injury.

Time & Location

May 17, 2019 | 11:00 AM

Fabeckstr. 23-25, Holzlaube, room -1.1020 (basement)