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Titolo:
THE PHASE-LOCKING OF AUDITORY GAMMA-BAND RESPONSES IN HUMANS IS SENSITIVE TO TASK PROCESSING
Autore:
YORDANOVA J; KOLEV V; DEMIRALP T;
Indirizzi:
ISTANBUL UNIV,ELECTRONEUROPHYSIOL RES & APPLICAT CTR TR-34390 CAPA TURKEY ISTANBUL UNIV,ELECTRONEUROPHYSIOL RES & APPLICAT CTR TR-34390 CAPA TURKEY BULGARIAN ACAD SCI,INST PHYSIOL BU-1113 SOFIA BULGARIA TURKISH SCI & TECH RES COUNCIL,TUBITAK,BRAIN DYNAM RES UNIT TR-06100 KAVAKLIDERE TURKEY
Titolo Testata:
NeuroReport
fascicolo: 18, volume: 8, anno: 1997,
pagine: 3999 - 4004
SICI:
0959-4965(1997)8:18<3999:TPOAGR>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
40-HZ OSCILLATIONS; BRAIN; HZ; EEG; DESYNCHRONIZATION; HIPPOCAMPUS;
Keywords:
COGNITIVE PROCESSES; EEG; EVENT-RELATED BRAIN POTENTIALS (ERPS); GAMMA BAND RESPONSE (GBR); OSCILLATORY BRAIN POTENTIALS; PHASE-LOCKING;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
J. Yordanova et al., "THE PHASE-LOCKING OF AUDITORY GAMMA-BAND RESPONSES IN HUMANS IS SENSITIVE TO TASK PROCESSING", NeuroReport, 8(18), 1997, pp. 3999-4004

Abstract

THE present study assessed the effects of stimulus task-relevance andcertainty on early and late 40 Hz (gamma) band responses (GBRs) in humans. Auditory GBRs of nine young adults were recorded in passive listening, simple reaction task, and choice-reaction task (target probability = 0.5) conditions and evaluated in three consecutive post-stimulusperiods (0-120, 120-250, 250-400 ms) corresponding to the serial occurrence of gamma oscillation bursts. Amplitude and phase-locking of GBRs within these bursts were analysed separately at the level of single sweeps by applying a method that allows the independent quantificationof between-sweep synchronization. Major results showed that the effects of stimulus certainty and task relevance on single response amplitude were specific and different from the effects on the phase-locking. The functional involvement of the early and late auditory gamma responses was distinct: early auditory gamma band responses appear primarilyassociated with focused attention, while the late gamma responses vary with motor-task relevance. It is concluded that along with power measures, the stability of phase-locking of gamma band responses should be regarded as a functionally meaningful parameter that varies with processing demands and recording site.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 23:27:55