Cocito L, Favale E, Tartaglione A
Boll Soc Ital Biol Sper. 1979 Jun 30;55(11):1077-83.
It has been previously reported that presentation of square-wave gratings to either side of the horizontal meridian of the visual field gives rise to different Simple Reaction Times (RTs), depending upon the spatial frequency of the stimuli. Specifically, for 1 c/deg stimulus RT is faster in the lower hemefield, whereas the reverse is true for 3 c/deg pattern, RT being faster in the upper visual field. In the reported experiment, RT to simultaneous presentation of either the same (alternatively 1 c/deg or 3 c/deg) or different (i.e. 1 c/deg and 3 c/deg combined) spatial frequencies to both hemifields was analyzed. The data show that whenever the two half components correspond to different RTs, the resulting RT equates that of the faster component. Conversely, when the two components give rise to identical RTs, the resulting RT does not differ from the value obtained with each half stimulus. Implications of this result for the functional organization of the visual system are discussed.
先前有报道称，向视野水平子午线的任一侧呈现方波光栅会产生不同的简单反应时间（RT），这取决于刺激的空间频率。具体而言，对于1 c/deg的刺激，在下半视野中反应时间更快，而对于3 c/deg的图案则相反，在上半视野中反应时间更快。在该报道的实验中，分析了对两个半视野同时呈现相同（交替为1 c/deg或3 c/deg）或不同（即1 c/deg和3 c/deg组合）空间频率的反应时间。数据表明，只要两个半成分对应不同的反应时间，最终的反应时间就等于较快成分的反应时间。相反，当两个成分产生相同的反应时间时，最终的反应时间与每个半刺激获得的值没有差异。讨论了该结果对视觉系统功能组织的影响。
