Jones R M, Tulunay-Keesey U
J Opt Soc Am. 1980 Jan;70(1):66-70. doi: 10.1364/josa.70.000066.
The phase selectivity of spatial frequency channels was measured, using an adaptation technique. Subjects first adapted to a grating of a given spatial frequency; subsequent threshold measurements were made at various spatial frequencies and phase shifts. Changes in the phase relationship between the test and adaptation gratings due to eye movements were circumvented by viewing the grating through an image stabilization apparatus. Local retinal adaptation was minimized by using an adaptation grating whose contrast flickered sinusoidally as a function of time. We were able to demonstrate channel-like frequency tuning for all conditions studied, but the threshold elevations following adaptation were always independent of the phase shift between the test and adaptation gratings. Our results imply that the channels which are selectively tuned to spatial frequency are not selectively tuned to spatial phase.
采用适应技术测量了空间频率通道的相位选择性。受试者首先适应给定空间频率的光栅；随后在各种空间频率和相移下进行阈值测量。通过图像稳定装置观察光栅，避免了由于眼球运动导致测试光栅与适应光栅之间相位关系的变化。使用对比度随时间呈正弦波动的适应光栅，使局部视网膜适应最小化。我们能够证明在所研究的所有条件下都存在类似通道的频率调谐，但适应后的阈值升高总是与测试光栅和适应光栅之间的相移无关。我们的结果表明，选择性调谐到空间频率的通道并非选择性调谐到空间相位。
