Document Detail

Synchronization of gamma oscillations increases functional connectivity of human hippocampus and inferior-middle temporal cortex during repetitive visuomotor events.
MedLine Citation:
PMID:  15182317     Owner:  NLM     Status:  MEDLINE    
Do recency processes associated with repetitive sensorimotor events modulate the magnitude and functional coupling of brain rhythmicity in human temporal cortex? Intracranial stereo electroencephalographic activity (SEEG; 256 Hz sampling rate) was recorded from hippocampus, and inferior (BA20) and middle (BA21) temporal cortex in four epilepsy patients. The repetitive events were represented by predicted imperative somatosensory stimuli (CNV paradigm) triggering hand movements ("repetitive visuomotor") or counting ("repetitive counting"). The non-repetitive events were "rare" (P3 paradigm) somatosensory stimuli triggering hand movements ("non-repetitive visuomotor") or counting ("non-repetitive counting"). Brain rhythmicity was indexed by event-related desynchronization/synchronization (ERD/ERS) of SEEG data, whereas the functional coupling was evaluated by spectral SEEG coherence between pairs of the mentioned areas. The frequency bands of interest were theta (4-8 Hz), alpha (8-12 Hz), beta (14-30 Hz), and gamma (32-46 Hz). Compared to the non-repetitive events, the "repetitive visuomotor" events showed a significant beta and gamma ERS in the hippocampus and a significant theta ERD in the inferior temporal cortex. Furthermore, the "repetitive visuomotor" events induced a task-specific significant gamma coherence among the examined areas. These results suggest that recency processes do modulate the magnitude and functional coupling of brain rhythmicity (especially gamma) in the human temporal cortex.
Claudio Babiloni; Martin Bares; Fabrizio Vecchio; Milan Brazdil; Pavel Jurak; Davide Vito Moretti; Alessandra Ubaldi; Paolo Maria Rossini; Ivan Rektor; Babiloni Claudio; Bares Martin; Vecchio Fabrizio; Brazdil Milan; Jurak Pavel; Moretti Davide Vito; Ubaldi Alessandra; Rossini Paolo Maria; Rektor Ivan
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The European journal of neuroscience     Volume:  19     ISSN:  0953-816X     ISO Abbreviation:  Eur. J. Neurosci.     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-06-08     Completed Date:  2004-08-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8918110     Medline TA:  Eur J Neurosci     Country:  France    
Other Details:
Languages:  eng     Pagination:  3088-98     Citation Subset:  IM    
Dipartimento di Fisiologia Umana e Farmacologia, Università degli Studi di Roma La Sapienza, Piazzale Aldo Moro 5, 00185 Rome, Italy.
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MeSH Terms
Brain Mapping
Cortical Synchronization*
Electroencephalography* / methods
Hippocampus / physiology*
Image Processing, Computer-Assisted / methods
Magnetic Resonance Imaging
Movement / physiology
Reaction Time / physiology
Temporal Lobe / physiology*
Visual Perception / physiology*
Erratum In:
Eur J Neurosci. 2004 Sep;20(6):1694
Note: Claudio, Babiloni [corrected to Babiloni, Claudio]; Martin, Bares [corrected to Bares, Martin]; Fabrizio, Vecchio [corrected to Vecchio, Fabrizio]; Milan, Brazdil [corrected to Brazdil, Milan]; Pavel, Jurak [corrected to Jurak, Pavel]; Vito, Moretti Davide [corrected to Moretti, Davide Vito]; Alessandra, Ubaldi [corrected to Ubaldi, Alessandra]; Maria, Rossini Paolo [corrected to Rossini, Paolo Maria]; Ivan, Rektor [corrected to Rektor, Ivan]

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