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Titre du document / Document title

Prediction of response speed by anticipatory high-frequency (gamma band) oscillations in the human brain

Auteur(s) / Author(s)

GONZALEZ ANDINO Sara L. (1) ; MICHEL Cristoph M. (1) ; THUT Gregor (2) ; LANDIS Theodor (1) ; GRAVE DE PERALTA Rolando (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Functional Brain Mapping Laboratory, Geneva University Hospital, Geneva, SUISSE
(2) Laboratory for Magnetic Brain Stimulation, Department of Neurology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, ETATS-UNIS

Résumé / Abstract

Response to a stimulus is faster when a subject is attending and knows beforehand how to respond. It has been suggested recently that this occurs because ongoing neuronal activity is spatially and temporally structured during states of expectancy preceding a stimulus. This mechanism is believed to mediate top-down processing, facilitating the early grouping and selection of distributed neuronal ensembles implicated in ensuing sensory-motor processing. To validate this model, it must be shown that some features of this early ongoing neural activity are correlated with subsequent perceptual decisions or behavioral events. We investigated this hypothesis in an electrophysiologic study in 12 subjects carrying out a simple visuomotor reaction-time task. Local field potentials (LFP) at each brain voxel were estimated using a linear distributed inverse solution termed ELECTRA for each single trial of each subject. The energy of oscillations for different frequency bands was computed for the period between the warning cue and visual stimuli by applying a time-frequency decomposition to the estimated LFP. A nonparametric correlation coefficient was then calculated between energy of oscillations and reaction times for each single sweep. Gamma band oscillatory activity in a frontoparietal network before stimulus onset significantly correlated with reaction time for a significant amount of subjects. These results provide direct evidence for the role of neural oscillations as a top-down attentional control mechanism that mediates the speed of motor actions.

Revue / Journal Title

Human brain mapping    ISSN  1065-9471 

Source / Source

2005, vol. 24, no1, pp. 50-58 [9 page(s) (article)] (1 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

Wiley-Liss, New York, NY, ETATS-UNIS  (1993) (Revue)

Mots-clés anglais / English Keywords

Central nervous system

;

Encephalon

;

Human

;

Oscillation

;

Frequency band

;

High frequency

;

Anticipation

;

Speed

;

Prediction

;

Radiodiagnosis

;

Nervous system diseases

;

Mots-clés français / French Keywords

Système nerveux central

;

Encéphale

;

Homme

;

Oscillation

;

Bande fréquence

;

Haute fréquence

;

Anticipation

;

Vitesse déplacement

;

Prédiction

;

Radiodiagnostic

;

Système nerveux pathologie

;

Mots-clés espagnols / Spanish Keywords

Sistema nervioso central

;

Encéfalo

;

Hombre

;

Oscilación

;

Banda frecuencia

;

Alta frecuencia

;

Anticipación

;

Velocidad desplazamiento

;

Predicción

;

Radiodiagnóstico

;

Sistema nervioso patología

;

Localisation / Location

INIST-CNRS, Cote INIST : 26079, 35400012577442.0050

Nº notice refdoc (ud4) : 16384364



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