Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/108323
Title: Cortical functional topography of high-frequency gamma activity relates to perceptual decision: an Intracranial study
Authors: Castelhano, J. 
Duarte, Isabel C. 
Abuhaiba, Sulaiman I. 
Rito, Manuel
Sales, Francisco 
Castelo-Branco, Miguel 
Issue Date: 2017
Publisher: Public Library of Science
Project: CENTRO-07-ST24-FEDER-00205 
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID/NEU/04539/2013/PT 
CENTRO-01-0145-FEDER-000016/BIGDATIMAGE 
SAICTPAC/0010/2015 
Serial title, monograph or event: PLoS ONE
Volume: 12
Issue: 10
Abstract: High-frequency activity (HFA) is believed to subserve a functional role in cognition, but these patterns are often not accessible to scalp EEG recordings. Intracranial studies provide a unique opportunity to link the all-encompassing range of high-frequency patterns with holistic perception. We tested whether the functional topography of HFAs (up to 250Hz) is related to perceptual decision-making. Human intracortical data were recorded (6 subjects; >250channels) during an ambiguous object-recognition task. We found a spatial topography of HFAs reflecting processing anterior dorsal and ventral streams, linked to decision independently of the type of processed object/stimulus category. Three distinct regional fingerprints could be identified, with lower gamma frequency patterns (<45Hz) dominating in the anterior semantic ventral object processing and dorsoventral integrating networks and evolving later, during perceptual decision phases, than early sensory posterior patterns (60-250Hz). This suggests that accurate object recognition/perceptual decision-making is related to distinct spatiotemporal signatures in the low gamma frequency range.
URI: https://hdl.handle.net/10316/108323
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0186428
Rights: openAccess
Appears in Collections:I&D CIBIT - Artigos em Revistas Internacionais

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