Aglioti S, Dall'Agnola R, Girelli M, Marzi C A
Institute of Human Physiology, University of Verona, Italy.
Cortex. 1991 Dec;27(4):571-81. doi: 10.1016/s0010-9452(13)80006-8.
Normal subjects have been tested for interhemispheric transfer (IT) of visuo-motor information using a simple reaction time (RT) paradigm and lateralized stimuli and responses (the so-called Poffenberger paradigm). In this paradigm IT time is assumed to correspond to the RT difference between crossed and uncrossed stimulus-response combinations (CUD). In Experiment 1, two types of movements were used: a unilateral flexion of the thumb and a unilateral plantar flexion of the big toe. A reliable CUD (7.4 msec) was found only with manual responses. Changing stimulus retinal eccentricity (10 degrees vs. 70 degrees) or attentional demands (blocked vs. random stimulus presentation) did not result in any reliable effect on the CUD. In Experiment 2 the number of RTs for each subject was considerably increased and several visual field sites (from areas close to the vertical meridian to the monocular crescent) were tested. Notwithstanding these modifications, this experiment confirmed the lack of CUD found for foot responses in Exp. 1. Taken together, these results are in keeping with a less lateralized hemispheric control of distal foot movements in comparison to hand movements.
已使用简单反应时间（RT）范式以及刺激和反应的侧化（即所谓的波芬伯格范式）对正常受试者进行了视觉运动信息的半球间传递（IT）测试。在该范式中，IT时间被假定为交叉和非交叉刺激-反应组合（CUD）之间的RT差异。在实验1中，使用了两种类型的动作：拇指的单侧屈曲和大脚趾的单侧跖屈。仅在手动反应时发现了可靠的CUD（7.4毫秒）。改变刺激的视网膜偏心度（10度与70度）或注意力需求（分组呈现与随机呈现刺激）对CUD均未产生任何可靠的影响。在实验2中，每个受试者的RT数量大幅增加，并测试了几个视野部位（从靠近垂直子午线的区域到单眼新月区）。尽管有这些改变，但该实验证实了在实验1中未发现足部反应的CUD。综上所述，这些结果表明，与手部运动相比，半球对足部远端运动的控制较少侧化。
