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Titolo:
Right words and left words: electrophysiological evidence for hemispheric differences in meaning processing
Autore:
Federmeier, KD; Kutas, M;
Indirizzi:
Univ Calif San Diego, Dept Cognit Sci, La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 it Sci, La Jolla, CA 92093 USA Univ Calif San Diego, Dept Neurosci, La Jolla, CA 92093 USA Univ Calif SanDiego La Jolla CA USA 92093 urosci, La Jolla, CA 92093 USA
Titolo Testata:
COGNITIVE BRAIN RESEARCH
fascicolo: 3, volume: 8, anno: 1999,
pagine: 373 - 392
SICI:
0926-6410(19991025)8:3<373:RWALWE>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVENT-RELATED POTENTIALS; RIGHT CEREBRAL HEMISPHERE; BRAIN-DAMAGED PATIENTS; LEXICAL DECISION; VISUAL-FIELDS; SPATIAL REPRESENTATIONS; SENTENCE CONTEXT; UPCOMING WORDS; SPECIALIZATION; LANGUAGE;
Keywords:
language; sentence processing; hemispheric differences; event-related potentials; N400;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
88
Recensione:
Indirizzi per estratti:
Indirizzo: Federmeier, KD Univ Calif San Diego, Dept Cognit Sci, 9500 Gilman Dr, La Jolla, CA 92093 USA Univ Calif San Diego 9500 Gilman Dr La Jolla CA USA 92093 A
Citazione:
K.D. Federmeier e M. Kutas, "Right words and left words: electrophysiological evidence for hemispheric differences in meaning processing", COGN BRAIN, 8(3), 1999, pp. 373-392

Abstract

Both cerebral hemispheres are involved in language processing, each playing a unique role that may derive from differences in knowledge organization and on-line meaning integration. Here, we examine lateralized differences in knowledge representation and retrieval using event-related potentials (ERPs) elicited by words in sentences. Volunteers read pairs of sentences ending with three target types: (1) expected words, (2) unexpected words from the expected semantic category, and (3) unexpected words from an unexpected category. Context was presented word by word at fixation while targets werepresented two degrees to the right or left of fixation. ERPs to unexpectedendings were more negative than those to expected endings in both visual fields. However, when presented to the right visual field (left hemisphere),unexpected items from the expected category elicited smaller N400s than those from an unexpected category. In contrast, when presented to the left visual field (right hemisphere) all unexpected endings elicited N400s of similar amplitude. Thus, while both hemispheres are sensitive to context, only the left hemisphere is sensitive to semantic similarity between an unexpected ending and the expected completion. The results suggest lateralized differences in how new information is integrated into sentences. We propose that right hemisphere processing is best characterized as 'integrative'; new information is compared directly with context information. In contrast, lefthemisphere processing is better characterized as 'predictive'; the processing of context leads to an expectation about the semantic features of upcoming items and new information is compared with that expectation rather thandirectly with the context. (C) 1999 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 21:49:49