Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Processing time of contour integration: the role of colour, contrast, and curvature
Autore:
Beaudot, WHA; Mullen, KT;
Indirizzi:
McGill Univ, McGill Vis Res, Dept Ophthalmol, Montreal, PQ H3A 1A1, CanadaMcGill Univ Montreal PQ Canada H3A 1A1 lmol, Montreal, PQ H3A 1A1, Canada
Titolo Testata:
PERCEPTION
fascicolo: 7, volume: 30, anno: 2001,
pagine: 833 - 853
SICI:
0301-0066(2001)30:7<833:PTOCIT>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRIMARY VISUAL-CORTEX; PATTERN-REVERSAL ELECTRORETINOGRAM; SPATIAL-FREQUENCY DISCRIMINATION; RED-GREEN; DETECTION MECHANISMS; CHROMATIC GRATINGS; LUMINANCE CONTRAST; SALIENT CONTOURS; RECEPTIVE-FIELDS; STRIATE CORTEX;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Citazioni:
70
Recensione:
Indirizzi per estratti:
Indirizzo: Beaudot, WHA McGill Univ, McGill Vis Res, Dept Ophthalmol, 687 Pine Ave W,H4-14, Montreal, PQ H3A 1A1, Canada McGill Univ 687 Pine Ave W,H4-14 Montreal PQ Canada H3A 1A1 a
Citazione:
W.H.A. Beaudot e K.T. Mullen, "Processing time of contour integration: the role of colour, contrast, and curvature", PERCEPTION, 30(7), 2001, pp. 833-853

Abstract

We investigated the temporal properties of the red-green, blue-yellow, andluminance mechanisms in a contour-integration task which required the linking of orientation across space to detect a 'path'. Reaction times were obtained for simple detection of the stimulus regardless of the presence of a path, and for path detection measured by a yes/no procedure with path and no-path stimuli randomly presented. Additional processing times for contour integration were calculated as the difference between reaction times for simple stimulus detection and path detection, and were measured as a functionof stimulus contrast for straight and curved paths. We found that processing time shows effects not apparent in choice reaction-time measurements. (i) Processing time for curved paths is longer than for straight paths. (ii) For straight paths, the achromatic mechanism is faster than the two chromatic ones, with no difference between the red-green and blue-yellow mechanisms. For curved paths there is no difference in processing time between mechanisms. (iii) The extra processing time required to detect curved compared to straight paths is longest for the achromatic mechanism, and similar for the red-green and blue-yellow mechanisms, (iv) Detection of the absence of apath requires at least 50 ms of additional time independently of chromaticity, contrast, and path curvature. The significance of these differences and similarities between postreceptoral mechanisms is discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 01:52:58