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Titolo:
INTERACTIONS BETWEEN MODULATED LUMINANCE PATTERNS AND RANDOM-DOT PATTERNS
Autore:
CORNELISSEN FW; KOOIJMAN AC;
Indirizzi:
UNIV GRONINGEN,CTR BEHAV & COGNIT NEUROSCI,EXPTL OPHTHALMOL LAB,POB 30001 9700 RB GRONINGEN NETHERLANDS
Titolo Testata:
Vision research
fascicolo: 19, volume: 34, anno: 1994,
pagine: 2561 - 2568
SICI:
0042-6989(1994)34:19<2561:IBMLPA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOW SPATIAL-FREQUENCIES; HUMAN OBSERVERS; EFFICIENCY; DENSITY; NUMEROSITY; ILLUSIONS; CONTRAST;
Keywords:
PATTERN DISCRIMINATION; CHANNELS; RANDOM-DOT PATTERN; ADAPTATION; SPATIAL VISION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
F.W. Cornelissen e A.C. Kooijman, "INTERACTIONS BETWEEN MODULATED LUMINANCE PATTERNS AND RANDOM-DOT PATTERNS", Vision research, 34(19), 1994, pp. 2561-2568

Abstract

It has been suggested that density modulated random-dot patterns can be used to study higher order pattern vision [Van Meeteren and Barlow (1981) Vision Research, 21, 765-777]. The high contrast dots of which the pattern is composed, are assumed to be reliably transduced-and transmitted by the lower levels of the visual system. Therefore, such dotpatterns could offer a way of by-passing the limits set by these earlier steps in the visual system. So, detection performance should reflect the capacity of more central visual mechanisms to combine and compare groups of dots. We test this assumption by selectively desensitizing the spatial frequency channels which are involved in detecting luminance contrast patterns. The results show a selective decrease in sensitivity for modulations in dot density at the adapting spatial frequency. We conclude that detection of differences in dot density is mediated by the same channels that detect luminance contrast. The conclusion by Van Meeteren and Barlow that dot patterns can be used to study higher order processing in the visual system appears not to be valid. In addition, we present a new type of modulated dot pattern of which the density modulations are shown to be invisible for the spatial frequencychannels. This pattern may therefore be used to study higher order visual processing.

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Documento generato il 26/09/20 alle ore 02:35:16