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Titolo:
Beyond junctions: nonlocal form constraints on motion interpretation
Autore:
McDermott, J; Weiss, Y; Adelson, EH;
Indirizzi:
Univ Coll London, Gatsby Computat Neurosci Unit, London WC1N 3AR, England Univ Coll London London England WC1N 3AR Unit, London WC1N 3AR, England MIT, Dept Brain & Cognit Sci, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139 pt Brain & Cognit Sci, Cambridge, MA 02139 USA Univ Calif Berkeley, Dept Comp Sci, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 omp Sci, Berkeley, CA 94720 USA
Titolo Testata:
PERCEPTION
fascicolo: 8, volume: 30, anno: 2001,
pagine: 905 - 923
SICI:
0301-0066(2001)30:8<905:BJNFCO>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
SURFACE SEGMENTATION MECHANISMS; APERTURE PROBLEM; VISUAL-MOTION; 2-DIMENSIONAL MOTION; PERCEIVED DIRECTION; LUMINANCE CONTRAST; COHERENT MOTION; OCCLUSION; INTEGRATION; PERCEPTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: McDermott, J Univ Coll London, Gatsby Computat Neurosci Unit, 17 Queen Sq,London WC1N 3AR, England Univ Coll London 17 Queen Sq London England WC1N3AR England
Citazione:
J. McDermott et al., "Beyond junctions: nonlocal form constraints on motion interpretation", PERCEPTION, 30(8), 2001, pp. 905-923

Abstract

Because of the aperture problem., local motion measurements must be combined across space. However, not all motions should be combined. Some arise from distinct objects and should be segregated, and some are due to occlusionand should be discounted because they are spurious. Humans have little difficulty ignoring spurious motions at occlusions and correctly integrating object motion, and are evidently making use of form information to do so. There is a large body of theoretical and empirical evidence supporting the importance of form processes involving junctions in the way motion is integrated. To assess the role of more complex form analysis, we manipulated nonlocal form cues that could be varied independently of local junctions. Using variants on diamond and plaid stimuli used in previous studies, we found that manipulations distant from the junctions themselves could cause large changes in motion interpretation. Nonlocal information often overrides the integration decisions that would be expected from local cues, The mechanisms implicated appear to involve surface segmentation, amodal completion, and depth ordering.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 09:35:17