Contrast coding and magno/parvo segregation revealed in reaction time studies

被引:55
作者
Murray, IJ
Plainis, S
机构
[1] UMIST, Dept Optometry & Neurosci, Visual Sci Lab, Manchester M60 1QD, Lancs, England
[2] Univ Crete, Sch Med, Div Ophthalmol, VEIC, Iraklion, Crete, Greece
基金
英国工程与自然科学研究理事会;
关键词
parvo-cellular; magno-cellular; reaction times; sinusoidal gratings; contrast spatial frequency;
D O I
10.1016/S0042-6989(03)00408-5
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Reaction times (RTs) are obtained for a wide range of contrasts of vertical sinusoidal gratings. The data are plotted as a function of the reciprocal of contrast. In some conditions, a single linear function accounts for the data. In others a clear bi-linear function is obtained. The low and high contrast regions of the function are interpreted as representing magno and parvo activity, respectively. RT-based supra-threshold sensitivity functions are obtained for different luminances, stimulus durations and eccentricities and these are compared with conventional threshold-based sensitivities to establish the extent to which RTs and contrast sensitivity are constrained by the same sensory processes. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2707 / 2719
页数:13
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