Open AccessCortical functional topography of high-frequency gamma activity relates to perceptual decision: an Intracranial study
Author(s) -
João Castelhano,
Isabel Catarina Duarte,
Sulaiman I Abuhaiba,
Manuel Rito,
Francisco Sales,
Miguel CasteloBranco
Publication year - 2017
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0186428
Subject(s) - perception , stimulus (psychology) , neuroscience , sensory system , electroencephalography , psychology , scalp , cognition , visual perception , brain mapping , neurophysiology , cognitive psychology , audiology , biology , anatomy , medicine
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.