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Titolo:
Light adaptation in motion direction judgments
Autore:
Takeuchi, T; De Valois, KK; Motoyoshi, I;
Indirizzi:
Univ Calif Berkeley, Dept Psychol, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 Psychol, Berkeley, CA 94720 USA NTT, Commun Sci Labs, Atsugi, Kanagawa 2430198, Japan NTT Atsugi KanagawaJapan 2430198 i Labs, Atsugi, Kanagawa 2430198, Japan Univ Calif Berkeley, Vis Sci Grp, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 Sci Grp, Berkeley, CA 94720 USA
Titolo Testata:
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
fascicolo: 4, volume: 18, anno: 2001,
pagine: 755 - 764
SICI:
1084-7529(200104)18:4<755:LAIMDJ>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
RETINAL GANGLION-CELLS; APPARENT MOTION; DETECTION THRESHOLDS; TEMPORAL-MODULATION; SCOTOPIC VISION; TIME-COURSE; LUMINANCE; DYNAMICS; MODEL; CONTRAST;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Takeuchi, T Univ Calif Berkeley, Dept Psychol, 3210 Tolman Hall, Berkeley,CA 94720 USA Univ Calif Berkeley 3210 Tolman Hall Berkeley CA USA 94720 USA
Citazione:
T. Takeuchi et al., "Light adaptation in motion direction judgments", J OPT SOC A, 18(4), 2001, pp. 755-764

Abstract

We examined the time course of light adaptation in the visual motion system. Subjects judged the direction of a two-frame apparent-motion display, with the two frames separated by a 50-ms interstimulus interval of the same mean luminance. The phase of the first frame was randomly determined on eachtrial. The grating presented in the second frame was phase shifted either leftward or rightward by pi /2 with respect to the grating in the first frame. At some variable point during the first frame, the mean luminance of the pattern increased or decreased by 1-3 log units. Mean luminance levels varied from scotopic or low mesopic to photopic levels. We found that the perceived direction of motion depended jointly on the luminance level of the first frame grating and the time at which the shift in average luminance occurs. When the average luminance increases from scotopic or mesopic to photopic levels at least 0.5 s before the offset of the first frame, motion in the 3 pi /2 direction is perceived. When average luminance decreases to low mesopic or scotopic levels, motion in the pi /2 direction is perceived if the change occurs 1.0 s or more before first frame offset, depending on the size of the luminance step. Thus light adaptation in the visual motion system is essentially complete within 1 s. This suggests a rapid change in the shape (biphasic or monophasic) of the temporal impulse response functions that feed into a first-order motion mechanism. (C) 2001 Optical Society of America.

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Documento generato il 24/10/20 alle ore 10:16:07