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Titolo:
WHAT DIRECTION OF MOTION DO WE SEE IF LUMINANCE BUT NOT COLOR CONTRAST IS REVERSED DURING DISPLACEMENT - PSYCHOPHYSICAL EVIDENCE FOR A SIGNED-COLOR INPUT TO MOTION DETECTION
Autore:
MORGAN MJ; INGLE G;
Indirizzi:
UNIV COLL LONDON,INST OPHTHALMOL,DEPT VISUAL SCI,BATH ST LONDON EC1V 9ET ENGLAND UNIV COLL LONDON,DEPT ANAT LONDON EC1V 9ET ENGLAND UNIV EDINBURGH,DEPT PHARMACOL EDINBURGH EH8 9JZ MIDLOTHIAN SCOTLAND
Titolo Testata:
Vision research
fascicolo: 19, volume: 34, anno: 1994,
pagine: 2527 - 2535
SICI:
0042-6989(1994)34:19<2527:WDOMDW>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPATIALLY RANDOM PATTERNS; MONKEY VISUAL-CORTEX; RANDOM-DOT PATTERNS; APPARENT MOTION; CHROMATIC GRATINGS; MACAQUE MONKEY; AREA MT; MOVEMENT; SEGREGATION; PERCEPTION;
Keywords:
MOTION; COLOR; SPATIAL FILTERING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
M.J. Morgan e G. Ingle, "WHAT DIRECTION OF MOTION DO WE SEE IF LUMINANCE BUT NOT COLOR CONTRAST IS REVERSED DURING DISPLACEMENT - PSYCHOPHYSICAL EVIDENCE FOR A SIGNED-COLOR INPUT TO MOTION DETECTION", Vision research, 34(19), 1994, pp. 2527-2535

Abstract

To investigate the effects of colour upon motion detection, directional discrimination by human observers was determined using two-frame kinematograms in which the two classes of element composing the pattern could differ either in luminance alone (achromatic condition), or in both colour and luminance (chromatic condition). The elements in the second frame could either have the same colour/luminance as corresponding elements in the first frame, or they could be changed (swapped) in colour and/or luminance. The angular size of the elements was varied bychanging the viewing distance. Changing colour between frames disrupted motion detection when the angular size of elements was large (0.9 deg) but not when they were small (0.225 deg), replicating a previous result. Detection of motion with chromatic patterns was generally superior to that with achromatic patterns, particularly with large element size. Luminance swap combined with colour swap produced the ''reverse phi'' phenomenon: however, when luminance was swapped with colour staying the same between frames, forward motion was seen, suggesting that forward motion based on colour dominated over reversed motion based onluminance. We conclude that signed chromatic information has an inputto motion detection at low but less so at high spatial frequencies. Information across colour and luminance is combined in a final common pathway for motion detection, resulting either in enhancement if they are in agreement, or in disruption if they conflict.

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Documento generato il 30/10/20 alle ore 09:59:25