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Titolo:
Event-related potentials in an auditory semantic oddball task in humans
Autore:
Kotchoubey, B; Lang, S;
Indirizzi:
Univ Tubingen, Dept Med Psychol & Behav Neurobiol, D-72074 Tubingen, Germany Univ Tubingen Tubingen Germany D-72074 robiol, D-72074 Tubingen, Germany
Titolo Testata:
NEUROSCIENCE LETTERS
fascicolo: 2-3, volume: 310, anno: 2001,
pagine: 93 - 96
SICI:
0304-3940(20010914)310:2-3<93:EPIAAS>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
BRAIN POTENTIALS; P300; CATEGORIZATION; SPECIFICITY; SURPRISE; WORDS;
Keywords:
P3; event-related potentials; semantic processing; oddball;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Kotchoubey, B Univ Tubingen, Dept Med Psychol & Behav Neurobiol, Gartenstr29, D-72074 Tubingen, Germany Univ Tubingen Gartenstr 29 Tubingen GermanyD-72074 Germany
Citazione:
B. Kotchoubey e S. Lang, "Event-related potentials in an auditory semantic oddball task in humans", NEUROSCI L, 310(2-3), 2001, pp. 93-96

Abstract

Whenever rare target stimuli are presented interspersed by frequent irrelevant stimuli (standards), the targets elicit a late parieto-central positive wave called P3. Usually standards and targets differ by a simple physicalfeature (e.g. tone pitch). Less consistent are the data obtained in semantic tasks, in which standards and targets are represented by different word classes. Given an equal number of words in the target and standard categories, each individual standard is more frequent than each target, that is, the frequency of the category is confounded with that of individual stimuli. In the present study participants were presented five semantic classes eachbeing represented by 15 words. Words belonging to one particular class should be counted. Thus targets were rare (20%), although the frequencies of each word and of each semantic class were equal. A highly significant P3 wasrecorded. Its latency was longer, and the amplitude was smaller, than whenstandards and targets were two tones. These data indicate that brain wavesrecorded in semantic tasks are not necessarily manifestations of specific semantic processing. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 10:13:20