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Titolo:
IS THE SOMATOSENSORY N250 RELATED TO DEVIANCE DISCRIMINATION OR CONSCIOUS TARGET DETECTION
Autore:
KEKONI J; HAMALAINEN H; MCCLOUD V; REINIKAINEN K; NAATANEN R;
Indirizzi:
HELSINKI UNIV,DEPT PSYCHOL,DIV GEN PSYCHOL,POB 11 FIN-00014 HELSINKI FINLAND UNIV TURKU,DEPT PSYCHOL FIN-20500 TURKU FINLAND UNIV TURKU,CTR COGNIT NEUROSCI FIN-20500 TURKU FINLAND HELSINKI UNIV,DEPT PSYCHOL,COGNIT PSYCHOPHYSIOL RES UNIT FIN-00014 HELSINKI FINLAND
Titolo Testata:
Electroencephalography and clinical neurophysiology. Evoked potentials
fascicolo: 2, volume: 100, anno: 1996,
pagine: 115 - 125
SICI:
0168-5597(1996)100:2<115:ITSNRT>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVENT-RELATED POTENTIALS; INTERMODAL SELECTIVE ATTENTION; EVOKED-POTENTIALS; SCALP TOPOGRAPHY; AUDITORY-STIMULI; LATE COMPONENTS; VISUAL-STIMULI; TASKS; P300; INFORMATION;
Keywords:
SOMATOSENSORY EVOKED POTENTIALS; SOMATOSENSORY N250; ATTENTION; STIMULUS DEVIANCE; DEVIANCE PROBABILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
42
Recensione:
Indirizzi per estratti:
Citazione:
J. Kekoni et al., "IS THE SOMATOSENSORY N250 RELATED TO DEVIANCE DISCRIMINATION OR CONSCIOUS TARGET DETECTION", Electroencephalography and clinical neurophysiology. Evoked potentials, 100(2), 1996, pp. 115-125

Abstract

Effects of attention to, and probability of sudden changes in, repetitive stimuli on somatosensory evoked potentials (SEP) were studied. Low- (30 Hz) and high-frequency (140 Hz) vibratory stimuli were delivered in random order to the middle finger of the left hand with differentpresentation probabilities in different blocks. Also ignore conditions were administered. In the ignore conditions, the probability had no effect on SEPs. However, when the standard stimuli were omitted, the ''deviants'' elicited small N140 and P300 deflections not observed in response to deviants when standards were also present. In the attentionconditions, deviant stimuli (targets) elicited large N250 and P300 deflections which increased in amplitude with a decreased target probability. However, when subjects counted infrequently presented ''deviants'' alone (standards omitted) the enhanced N140 and the P300 with shortened latency were elicited, but no N250 wave could be found. At the ipsilateral side, a distinct N200 deflection was seen which could be theN250 with a shorter latency because of an easier task (detection instead of discrimination). The results might be interpreted as suggestingthat the somatosensory N250 is related to conscious detection of target stimuli.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 02:46:00