Open AccessRelationship between task‐related gamma oscillations and BOLD signal: New insights from combined fMRI and intracranial EEG
Author(s) -
Lachaux JeanPhilippe,
Fonlupt Pierre,
Kahane Philippe,
Minotti Lorella,
Hoffmann Dominique,
Bertrand Olivier,
Baciu Monica
Publication year - 2007
Publication title -
human brain mapping
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.005
H-Index - 191
eISSN - 1097-0193
pISSN - 1065-9471
DOI - 10.1002/hbm.20352
Subject(s) - electroencephalography , neuroscience , eeg fmri , psychology , neuroimaging , cognition , magnetoencephalography , human brain , brain activity and meditation , functional magnetic resonance imaging , brain mapping , task (project management) , hum , cognitive psychology , artificial intelligence , computer science , management , economics , art , performance art , art history
Abstract Cognitive neuroscience relies on two sets of techniques to map the neural networks underlying cognition in humans: recordings of either regional metabolic changes (fMRI or PET) or fluctuations in the neural electromagnetic fields (EEG and MEG). Despite major advances in the last few years, an explicit linkage between the two is still missing and the neuroimaging community faces two complementary but unrelated sets of functional descriptions of the human brain. Such an explicit framework, linking the two approaches in potentially complex cognitive tasks and in a variety of brain regions would permit to combine them into fine spatio‐temporally‐grained human brain mapping procedures. We combined fMRI and intra‐cranial EEG recordings of the same epileptic patients during a semantic decision task and found a close spatial correspondence between regions of fMRI activations and recording sites showing EEG energy modulations in the gamma range (>40 Hz). Our findings further support previous findings that gamma band modulations co‐localize with BOLD variations and also indicate that fMRI may be used as a constraint to improve source reconstruction of gamma band EEG responses. Hum Brain Mapp, 2007. © 2007 Wiley‐Liss, Inc.