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Titolo:
BRAIN INDEXES OF NONCONSCIOUS ASSOCIATIVE LEARNING
Autore:
WONG PS; BERNAT E; BUNCE S; SHEVRIN H;
Indirizzi:
NEW SCH SOCIAL RES,DEPT PSYCHOL,65 5TH AVE NEW YORK NY 10003 UNIV MICHIGAN,MED CTR,DEPT PSYCHIAT ANN ARBOR MI 48109
Titolo Testata:
Consciousness and cognition (Print)
fascicolo: 4, volume: 6, anno: 1997,
pagine: 519 - 544
SICI:
1053-8100(1997)6:4<519:BIONAL>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTINGENT NEGATIVE-VARIATION; SKIN-CONDUCTANCE RESPONSES; REPEATED MEASURES DESIGNS; EVENT-RELATED POTENTIALS; SHOCK-ASSOCIATED WORDS; ELECTRODERMAL RESPONSES; AUTONOMIC RESPONSES; FACIAL EXPRESSIONS; CONDITIONED-STIMULI; MASKED STIMULI;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
58
Recensione:
Indirizzi per estratti:
Citazione:
P.S. Wong et al., "BRAIN INDEXES OF NONCONSCIOUS ASSOCIATIVE LEARNING", Consciousness and cognition (Print), 6(4), 1997, pp. 519-544

Abstract

Using a classical conditioning technique, this study investigated whether nonconscious associative learning could be indexed by event-related brain activity (ERP). There were three phases. In a preconditioningbaseline phase, pleasant and unpleasant facial schematics were presented in awareness (suprathreshold). A conditioning phase followed, in which stimuli were presented outside awareness (subthreshold, via energy masking), with an unpleasant face (CS+) linked to an aversive shack and a pleasant face (CS-) not linked to a shock. The third, postconditioning phase, involved stimulus presentations in awareness (suprathreshold). Evidence for acquisition of a conditional response was sought by comparing suprathreshold pre-and postconditioning phases, as well asin the subthreshold conditioning phase itself. For the pre-postconditioning phase analyses, significant ERP component differences differentiating CSS and CS-were observed for NI, P2, and especially P3. For theconditioning phase, significant differences were observed in the 100-400 ms. post-stimulus region reflecting a CS+ processing negativity. Brain activity does indeed index the acquisition of a conditional response to subthreshold stimuli. Associative learning can occur outside awareness. (C) 1997 Academic Press.

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Documento generato il 07/07/20 alle ore 05:41:09