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Titolo:
Selective visual-spatial attention alters induced gamma band responses in the human EEG
Autore:
Gruber, T; Muller, MM; Keil, A; Elbert, T;
Indirizzi:
Univ Konstanz, Dept Psychol, D-78457 Constance, Germany Univ Konstanz Constance Germany D-78457 chol, D-78457 Constance, Germany
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 12, volume: 110, anno: 1999,
pagine: 2074 - 2085
SICI:
1388-2457(199912)110:12<2074:SVAAIG>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEURAL MECHANISMS; AVERAGE REFERENCE; BRAIN POTENTIALS; CORTICAL MECHANISMS; FEATURE-INTEGRATION; CELL ASSEMBLIES; CURRENT-DENSITY; AREA MT; MOTION; CORTEX;
Keywords:
human high density EEG; induced gamma band response; spatial attention; perception; vision;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
85
Recensione:
Indirizzi per estratti:
Indirizzo: Gruber, T Univ Konstanz, Dept Psychol, POB D-25, D-78457 Constance, Germany Univ Konstanz POB D-25 Constance Germany D-78457 tance, Germany
Citazione:
T. Gruber et al., "Selective visual-spatial attention alters induced gamma band responses in the human EEG", CLIN NEU, 110(12), 1999, pp. 2074-2085

Abstract

Objectives: The present study was designed to investigate the attentional modulation of gamma band responses in a visual spatial attention task usinga 128-channel-EEG-montage. Methods: Colored rectangles were presented on a screen. After 500 ms an arrow indicated whether subjects had to shift their attention to the left or right half of the screen to detect target stimuli. During the task, either the attended half of the screen rotated horizontally while the unattended part remained motionless, or vice versa. Results: When subjects attended the rotating stimulus, we found significantly higher power in a specific gamma band from 35-51 Hz on parieto-occipital electrode sites contralateral to the stimulation side. In addition, afterthe onset of the arrow which indicated what side subjects should direct their attention to, the 35-51 Hz response shifted from a broad posterior distribution to an increase of power at parietooccipital sites contralateral tothe to-be-attended side. Furthermore, the rotating stimulus elicited higher gamma band power as compared to the standing stimulus at electrode locations, which may be related to the activity of underlying cortical structuresspecialized for motion processing. Conclusions: The present results replicate important parts of previous findings of enhanced gamma power when a moving stimulus was attended. (C) 1999Elsevier Science ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 15:57:52