Peterzell D H, Harvey L O, Hardyck C D
Percept Psychophys. 1989 Nov;46(5):443-55. doi: 10.3758/bf03210859.
The hypothesis that the two cerebral hemispheres are specialized for processing different visual spatial frequencies was investigated in three experiments. No differences between the left and right visual fields were found for: (1) contrast-sensitivity functions measured binocularly with vertical gratings ranging from 0.5 to 12 cycles per degree (cpd); (2) visible persistence durations for 1- and 10-cpd gratings measured with a stimulus alternation method; and (3) accuracy (d') and reaction times to correctly identify digitally filtered letters as targets (L or H) or nontargets (T or F). One significant difference, however, was found: In Experiment 3, a higher decision criterion (beta) was used when filtered letters were identified in the right visual field than when they were identified in the left. The letters were filtered with annular, 1-octave band-pass filters with center spatial frequencies of 1, 2, 4, 8, and 16 cpd. Combining four center frequencies with three letter sizes (0.5 degrees, 1 degree, and 2 degrees high) made some stimuli equivalent in distal spatial frequency (cycles per object) and some equivalent in proximal spatial frequency (cycles per degree). The effective stimulus in the third experiment seemed to be proximal spatial frequency (cycles per degree) not distal (cycles per object). We conclude that each cerebral hemisphere processes visual spatial frequency information with equal accuracy but that different decision rules are used.
在三个实验中，对两个大脑半球专门处理不同视觉空间频率的假设进行了研究。在以下方面未发现左右视野之间存在差异：（1）使用每度0.5至12周（cpd）的垂直光栅进行双眼测量的对比敏感度函数；（2）使用刺激交替法测量的1 cpd和10 cpd光栅的可见持续时间；以及（3）正确识别数字滤波字母作为目标（L或H）或非目标（T或F）的准确性（d'）和反应时间。然而，发现了一个显著差异：在实验3中，当在右视野中识别滤波字母时，使用的决策标准（β）高于在左视野中识别时。字母用中心空间频率为1、2、4、8和16 cpd的环形1倍频程带通滤波器进行滤波。将四个中心频率与三种字母大小（高0.5度、1度和2度）相结合，使得一些刺激在远端空间频率（每物体周数）上等效，一些在近端空间频率（每度周数）上等效。第三个实验中的有效刺激似乎是近端空间频率（每度周数）而非远端（每物体周数）。我们得出结论，每个大脑半球以相同的准确性处理视觉空间频率信息，但使用不同的决策规则。
