Abstract:
:The change in sensitivity across some stimulus dimension which follows adaptation to a particular stimulus can reveal a great deal about the tuning characteristics of underlying sensory/perceptual mechanisms. In this study, a psychophysical adaptation paradigm was employed to characterize the disparity tuning of perceptual mechanisms involved in stereopsis. The stimulus was a dynamic random-dot stereogram (DRDS) portraying a surface which varied in interocular correlation (IOC) and retinal disparity. Adaptation to a fully correlated DRDS surface produced an elevation in IOC threshold over a relatively narrow range of disparities, with maximum effect at the disparity of the adapting stimulus. The width of these disparity tuning functions varied from 5 arc min for adaptation at the horopter to 20 arc min for adaptation at 20 arc min disparity. Frequently, IOC sensitivity was enhanced for disparities on either side of the adapted disparity, suggesting that an opponent center-surround organization operates at an early level of disparity processing. A model of underlying channel structure consistent with these data is presented.
journal_name
Vision Resjournal_title
Vision researchauthors
Stevenson SB,Cormack LK,Schor CM,Tyler CWdoi
10.1016/0042-6989(92)90161-bsubject
Has Abstractpub_date
1992-09-01 00:00:00pages
1685-94issue
9eissn
0042-6989issn
1878-5646pii
0042-6989(92)90161-Bjournal_volume
32pub_type
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