Cortical functional topography of high-frequency gamma activity relates to perceptual decision: an Intracranial study

• DOI: 10.1371/journal.pone.0186428
• Publication Date: 2017-10-26T13:52:05Z
• Authors: João Castelhano; Isabel C. Duarte; Sulaiman I. Abuhaiba; Manuel Rito; Francisco Sales; Miguel Castelo-Br...
• Keywords: Stimulus (psychology); Brain mapping; Neurophysiology

High-frequency activity (HFA) is believed to subserve a functional role in cognition, but these patterns are often not accessible scalp EEG recordings. Intracranial studies provide unique opportunity link the all-encompassing range of high-frequency with holistic perception. We tested whether topography HFAs (up 250Hz) related perceptual decision-making. Human intracortical data were recorded (6 subjects; >250channels) during an ambiguous object-recognition task. found spatial reflecting processing anterior dorsal and ventral streams, linked decision independently type processed object/stimulus category. Three distinct regional fingerprints could be identified, lower gamma frequency (<45Hz) dominating semantic object dorsoventral integrating networks evolving later, phases, than early sensory posterior (60-250Hz). This suggests that accurate recognition/perceptual decision-making spatiotemporal signatures low range.