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Titolo:
EEG changes during word and figure categorization
Autore:
Harmony, T; Fernandez, T; Fernandez-Bouzas, A; Silva-Pereyra, J; Bosch, J; Diaz-Comas, L; Galan, L;
Indirizzi:
Ctr Neurobiol, Queretaro 76230, Qro, Mexico Ctr Neurobiol Queretaro Qro Mexico 76230 ol, Queretaro 76230, Qro, Mexico UNAM, ENEP Iztacala, Mexico City, DF, Mexico UNAM Mexico City DF MexicoUNAM, ENEP Iztacala, Mexico City, DF, Mexico
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 8, volume: 112, anno: 2001,
pagine: 1486 - 1498
SICI:
1388-2457(200108)112:8<1486:ECDWAF>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON EMISSION TOMOGRAPHY; EVENT-RELATED POTENTIALS; HUMAN BRAIN; MENTAL CALCULATION; PICTURES; MEMORY; PERFORMANCE; TASK; PET; FREQUENCIES;
Keywords:
EEG; EEG sources; semantic system; figure categorization; word categorization; qEEG; semantic memory;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
69
Recensione:
Indirizzi per estratti:
Indirizzo: Harmony, T Ctr Neurobiol, Campus UNAM UAQ Juriquilla,Km 15 Carretera Qro SL, Queretaro 76230, Qro, Mexico Ctr Neurobiol Campus UNAM UAQ Juriquilla,Km15 Carretera Qro SL Queretaro Qro Mexico 76230
Citazione:
T. Harmony et al., "EEG changes during word and figure categorization", CLIN NEU, 112(8), 2001, pp. 1486-1498

Abstract

Objective: To analyze whether the EEG changes observed during figure and word categorization are compatible with either the dual, the common amodal, or the alternative model (modality-specific codes for words and pictures, where meaning is represented for both in a higher-order amodal system) for semantic knowledge. Methods: EEG was recorded during word and figure categorization of animalsor non-animals in a-group of 28 children 8-10 years old. Computation of EEG sources in the frequency domain using variable resolution electrical tomography (VARETA) and their statistical evaluation by statistical parametric mapping were carried out. Results: At all frequencies, there were significant changes between EEG segments prior to the presentation of the stimuli and EEG segments recorded after the stimuli. Post-segments showed more power from 1.56 to 7.02 Hz, andless power than pre-segments from 8 to 12.48 Hz. EEG changes were only observed in the word task at: 3.9 (left occipital), 4.68, 5.46, and 6.24 Hz (temporo-occipital regions). These changes may be associated with visual encoding of words. Frequencies 7.8 and 17.94 Hz increased in prefrontal, anterior cingulate, and anterior temporal regions only during figure categorization. The prefrontal region may be related to object working memory. Thus, these frequencies might be related to figure codification. No significant differences between tasks were observed at 3.12 and 7.02 Hz in very wide brainareas (all lobes except occipital), suggesting that the amodal semantic system storage could be the model compatible with figure and word categorization. Conclusions: Thus, our results support the modified amodal semantic hypothesis, which advocates that the meanings of both kinds of stimuli are represented in a conceptual memory that receives input from the logogen and iconogen systems. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.

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Documento generato il 19/01/20 alle ore 20:30:26