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Titolo:
Contextual influences on orientation discrimination: binding local and global cues
Autore:
Mareschal, I; Sceniak, MP; Shapley, RM;
Indirizzi:
NYU, Ctr Neural Sci, New York, NY 10003 USA NYU New York NY USA 10003NYU, Ctr Neural Sci, New York, NY 10003 USA
Titolo Testata:
VISION RESEARCH
fascicolo: 15, volume: 41, anno: 2001,
pagine: 1915 - 1930
SICI:
0042-6989(200107)41:15<1915:CIOODB>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIGURE-GROUND SEGMENTATION; MACAQUE VISUAL-CORTEX; SPATIAL-FREQUENCY; CONTOUR INTEGRATION; PERCEIVED CONTRAST; TEXTURE PATTERNS; HUMAN VISION; FACILITATION; CELLS; RESPONSES;
Keywords:
contextual influences; orientation discrimination; cues;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Mareschal, I NYU, Ctr Neural Sci, 4 Washington Pl, New York, NY 10003 USA NYU 4 Washington Pl New York NY USA 10003 York, NY 10003 USA
Citazione:
I. Mareschal et al., "Contextual influences on orientation discrimination: binding local and global cues", VISION RES, 41(15), 2001, pp. 1915-1930

Abstract

We sought to determine how local and global features within an image interact by examining whether orientation discrimination thresholds could be modified by contextual information. In particular, we Investigated how local orientation signals within an image are pooled together, and whether this pooling process is dependent on the global orientation content present in theimage. We find that observers' orientation judgments depend on surround contextual information, with performance being optimal when the center and surround stimuli are clearly distinct. In cases where the center and surroundwere not clearly segregated, we report two sets of results. If there was an ambiguity regarding the perception of a global structure (i.e. a small mismatch between local cues), observers' performance was impaired. If there was no mismatch and local and global cues were consistent with the perception of a single surface, observers performed as well as in the distinct surfaces case. Although some of our results can be largely accounted for by interactions between differently oriented filters, other aspects are more difficult to reconcile with this explanation. We suggest that low level filtering constrains observers' performance, and that influences arising from imagesegmentation modify how local orientation signals are pooled together. (C)2001 Elsevier Science Ltd. 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 07:11:22