Motion-reversal reveals two motion mechanisms functioning in scotopic vision

被引：52

作者：

Takeuchi, T

DeValois, KK

机构：

[1] UNIV CALIF BERKELEY,DEPT PSYCHOL,BERKELEY,CA 94720

[2] UNIV CALIF BERKELEY,GRP VIS SCI,BERKELEY,CA 94720

来源：

VISION RESEARCH | 1997年 / 37卷 / 06期

关键词：

motion; scotopic vision; motion energy; feature tracking;

D O I：

10.1016/S0042-6989(96)00207-6

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

We studied scotopic motion mechanisms, using a two-frame sinusoidal grating separated by various ISIs equated for mean luminance level. Perceived direction of displacement varied with both ISI and luminance. As luminance decreased; apparent motion reversal disappeared. This is predicted by a first-order motion model if the underlying temporal impulse response function varies from biphasic under photopic conditions to monophasic under scotopic conditions, Performance at long (but not short) ISIs depends upon stimulus. contrast, suggesting there is also a scotopic feature-tracking mechanism. With isoluminant and high spatial frequency gratings, where the temporal impulse response function is monophasic, no motion reversal was observed. (C) 1997 Elsevier Science Ltd.

引用

页码：745 / 755

页数：11

共 58 条

[11] SPATIOTEMPORAL ORGANIZATION OF SIMPLE-CELL RECEPTIVE-FIELDS IN THE CATS STRIATE CORTEX .2. LINEARITY OF TEMPORAL AND SPATIAL SUMMATION [J].