第31回日本神経科学大会

日程:2008年7月9日(水)から11日(木)
場所:東京都千代田区丸の内3丁目 東京国際フォーラム

発表日: 2008年7月10日
発表形式: 口頭
抄録O2-C10

Spatial profile of disparity signal integration for fine depth judgment

Takahiro Doi, Takahiro Okada, Ichiro Fujita
Lab Cognitive Neurosci, Osaka Univ, Toyonaka

Acuity for perceiving stereoscopic depth is improved when a reference plane is available beside a test plane, suggesting an importance of combining binocular-disparity signals from different locations. We present a functional description of how the brain spatially weighs and integrates disparity signals for stereoacuity. The spatial weighting function, estimated by a psychophysical reverse-correlation method, peaked near the disparity boundary between the test and reference planes. The weights were smaller for areas distant from the boundary. At 4 deg from the disparity border, the weight was 10% of the peak (for stimuli with 3.5 deg eccentricity). Subjects showed a curious perceptual bias to judge a depth plane to be near regardless of its disparity when the other plane had binocularly uncorrelated noise. We estimated a weighting function for this bias. It showed a similar profile to but smaller weights than the weighting function for veridical judgment. The results suggest that selective use of signals from the disparity boundary underlies veridical fine depth judgment and task-irrelevant perceptual bias.

KAKENHI(17022025)