方位辨别知觉学习的眼传递及空间频率调谐特性

为了研究方位辨别知觉学习的神经机制,采用心理物理的方法,研究了方位辨别知觉学习的空间频率调谐与眼传递特性.通过对9个被试在固定空间频率（周期/度）进行方位辨别的训练,并于训练前后在多个空间频率（0.5, 1, 2, 4, 8, 16和32周期/度）测量方位辨别的阈值,发现被试在训练空间频率的方位辨别阈值平均下降了7.01 dB,并且这种学习效应可显著传递到非训练眼.学习效应可分为两个部分：一部分可传递到其他空间频率（4.10 dB）,另外一部分则特异于训练空间频率（2.95 dB）.这些结果说明方位辨别学习可能发生在双眼信息汇聚之后的视皮层,且可能有多种机制参与其中.

Perceptual learning of orientation discrimination:spatial frequency tuning and interocular generalization

In order to investigate the neural mechanism of perceptual learning of orientation discrimination,the psychophysics method was used for the research of eye specificity and spatial frequency tuning about orientation discrimination learning.Nine adult subjects were recruited and trained at fixed spatial frequency(2 cycles/degree) in randomly selected eyes.Orientation discrimination threshold at 7 spatial frequencies(0.5,1,2,4,8,16 and 32 cycles/degree) were tested before and after training in both eyes.We found the threshold of orientation discrimination decreased 7.01 dB on average at the trained spatial frequency and the training effect could transfer almost completely to the untrained eye(6.81 dB at the trained spatial frequency).The learning effect can be divided into two components: one relates to the generalized effect(4.10 dB) that can transfer to other untrained spatial frequencies,and the other relates to a limited mechanism(2.95 dB) that is specific to the training spatial frequency.These results suggest that orientation discrimination learning may occur beyond binocular convergence and that more than one mechanism is involved in the learning process.