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Titolo:
Neural substrates for visual perceptual grouping in humans
Autore:
Han, SH; Song, Y; Ding, YL; Yund, EW; Woods, DL;
Indirizzi:
Peking Univ, Dept Psychol, Beijing 100871, Peoples R China Peking Univ Beijing Peoples R China 100871 ijing 100871, Peoples R China Univ Sci & Technol China, Beijing Lab Cognit Sci, Beijing, Peoples R ChinaUniv Sci & Technol China Beijing Peoples R China ijing, Peoples R China Univ Calif Davis, VA No Calif Syst Clin, Dept Neurol, Martinez, CA USA Univ Calif Davis Martinez CA USA yst Clin, Dept Neurol, Martinez, CA USA
Titolo Testata:
PSYCHOPHYSIOLOGY
fascicolo: 6, volume: 38, anno: 2001,
pagine: 926 - 935
SICI:
0048-5772(200111)38:6<926:NSFVPG>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIGURE-GROUND SEGREGATION; HEMISPHERIC-DIFFERENCES; SELECTIVE ATTENTION; SPATIAL-FREQUENCIES; GESTALT PRINCIPLES; OBJECT RECOGNITION; CORTICAL AREAS; REACTION-TIME; CORTEX; ORGANIZATION;
Keywords:
cortex; event-related potentials; gestalt; grouping; proximity; similarity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Han, SH Peking Univ, Dept Psychol, 5 Yiheyuan Rd, Beijing 100871, Peoples R China Peking Univ 5 Yiheyuan Rd Beijing Peoples R China 100871 R China
Citazione:
S.H. Han et al., "Neural substrates for visual perceptual grouping in humans", PSYCHOPHYSL, 38(6), 2001, pp. 926-935

Abstract

Two experiments investigated the neural mechanisms of Gestalt grouping by recording high-density event-related brain potentials (ERPs) during discrimination tasks. In Experiment 1, stimulus arrays contained luminance-definedlocal elements that were either evenly spaced or grouped into columns or rows based on either proximity or similarity of shape. Proximity grouping was indexed by a short-latency positivity (110-120 ms) over the medial occipital cortex and a subsequent right occipitoparietal negativity. Grouping by similarity was reflected only in a long-latency occipitotemporal negativity. In Experiment 2, proximity grouping was examined when local elements weredefined by motion cues, and was again associated with a medial occipital positivity. However, the subsequent long-latency negativity was now enhancedover the left posterior areas. The implications of these results to the neural substrates subserving different grouping processes are discussed.

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Documento generato il 01/04/20 alle ore 01:02:23