SPATIAL-FREQUENCY DISCRIMINATION OF DRIFTING GRATINGS

被引：6

作者：

GREENLEE, MW ^{[1
]}

GERLING, J ^{[1
]}

WALTENSPIEL, S ^{[1
]}

机构：

[1] UNIV FREIBURG,AUGENKLIN,NEUROOPHTHALMOL ABT,W-7800 FREIBURG,GERMANY

来源：

VISION RESEARCH | 1990年 / 30卷 / 09期

关键词：

Contrast Channels; Spatial-frequency discrimination; Stimulus velocity;

D O I：

10.1016/0042-6989(90)90007-8

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

Spatial-frequency discrimination thresholds were measured for briefly (300 msec) presented sinewave gratings having a contrast one logarithmic unit above detection threshold. The gratings were drifted at rates varying from 1.1 to 40 Hz. In a two-interval forced-choice paradigm thresholds were determined for vertically and obliquely oriented gratings. Three reference spatial frequencies (1, 4, 12 c/deg) were tested. For the 1 c/deg reference spatial frequency, spatial-frequency discrimination thresholds were constant over the wide range of drift rates used. For 4 and 12 c/deg reference gratings, discrimination thresholds were constant for drift frequencies up to 14 Hz. For drift frequencies beyond 14 Hz, spatial-frequency discrimination thresholds increased abruptly, rising from approx. 6% at 14 Hz to 25% at 40 Hz drift rate. Measurements with obliquely oriented gratings yielded comparable results. The increase in the spatial-frequency discrimination threshold for medium-high spatial frequencies and high temporal frequencies might reflect an increase in the spatial frequency bandwidth of the mechanisms sensitive to these stimulus frequencies. © 1990.

引用

页码：1331 / 1339

页数：9