DISPARITY-TUNED CHANNELS OF THE HUMAN VISUAL-SYSTEM

被引:40
|
作者
CORMACK, LK [1 ]
STEVENSON, SB [1 ]
SCHOR, CM [1 ]
机构
[1] UNIV CALIF BERKELEY, SCH OPTOMETRY, BERKELEY, CA 94720 USA
关键词
STEREOPSIS; DISPARITY; CHANNELS;
D O I
10.1017/S0952523800005290
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Traditionally, it has been thought that the processing of binocular disparity for the perception of stereoscopic depth is accomplished via three types of disparity-selective channels-''near,'' ''far,'' and ''tuned.'' More recent evidence challenges this notion. We have derived disparity-tuning functions psychophysically using a subthreshold summation (i.e. low-level masking) technique. We measured correlation-detection thresholds for dynamic random-element stereograms containing either one or two surfaces in depth. The resulting disparity-tuning functions show an opponent-type profile, indicating the presence of inhibition between disparity-tuned units in the visual system. Moreover, there is clear inhibition between disparities of the same sign, obviating a strict adherence to near-far opponency. These results compare favorably with tuning functions derived psychophysically using an adaptation technique, and with the tuning profiles from published single-unit recordings. Our results suggests a continuum of overlapping disparity-tuned channels, which is consistent with recent physiological evidence as well as models based on other psychophysical data.
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页码:585 / 596
页数:12
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