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Titolo:
Envelope size-tuning for transient disparity vergence
Autore:
Sato, M; Edwards, M; Schor, CM;
Indirizzi:
Univ Calif Berkeley, Sch Optometry, Vis Sci Grp, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 Sci Grp, Berkeley, CA 94720 USA
Titolo Testata:
VISION RESEARCH
fascicolo: 13, volume: 41, anno: 2001,
pagine: 1695 - 1707
SICI:
0042-6989(200106)41:13<1695:ESFTDV>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPATIAL-FREQUENCY; STEREOPSIS; CONTRAST; SYSTEM; FUSION; DEPTH;
Keywords:
second order; transient; disparity vergence; size tuning;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Schor, CM Univ Calif Berkeley, Sch Optometry, Vis Sci Grp, 360 Minor Hall,Berkeley,CA 94720 USA Univ Calif Berkeley 360 Minor Hall Berkeley CA USA 94720 720 USA
Citazione:
M. Sato et al., "Envelope size-tuning for transient disparity vergence", VISION RES, 41(13), 2001, pp. 1695-1707

Abstract

Our prior studies have demonstrated that the transient-vergence system responds preferably to dichoptic stimulus pairs that contain the highest combined energy, regardless of dichoptic differences in spatial frequency, contrast, orientation, or luminance polarity (Edwards, M., Pope, D. R., & Schor,C. M. (1998), Vision Research 38, 705; Pope, D. R., Edwards, M., & Schor, C. M. (1999) Vision Research 39, 575). This broadband tuning for spatial frequency, orientation and contrast is indicative of a second order (non-linear) extraction system. The current study examined the potential size-tuningof binocular channels to the contrast envelope that is extracted by a non-linear process. Stimuli were size-scaled Gabor patches with parallel and orthogonal carrier orientations that subtended a large (3.8 degrees) disparity. Results indicate that the transient-vergence system exhibits broad band-pass tuning to overall size of dichoptic targets, independent of interocular differences in carrier orientation, spatial frequency or contrast. Equal sizes elicited a higher proportion of vergence responses than unequal sizes, however responses to unequal size still occurred over a 2-octave range, illustrating broad band-pass tuning. Size tuning was found to be broader forsmall than large envelope sizes. The broad tuning for envelope size is likely to result from the overlapping extracted low-pass frequency spectra of the contrast envelopes. However, the transient-vergence system also responds to monocular, hemi-retinal stimuli over a larger (3-octave) range. Thus some of the observed 'binocular tuning' may be due to these monocular responses. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 28/03/20 alle ore 10:49:21