Redding Gordon M, Wallace Benjamin
Department of Psychology, Illinois State University, Normal, IL 61790-4620, USA.
J Mot Behav. 2009 Jan;41(1):83-94. doi: 10.1080/00222895.2009.10125920.
The authors hypothesized that failure of visual adaptation to transfer from an individual's exposed right hand to the unexposed left hand arises from hemispheric asymmetry in eye-hand coordination, such that the dominant eye-right-hand system is specialized for action in the right body space. Groups received combinations of exposed dominant or nondominant hands and right or left prismatic displacement. Following prism exposure (terminal feedback), the authors measured aftereffects for proprioceptive straight-ahead and straight-ahead target pointing for both hands. They measured visual straight-ahead aftereffects, starting from the left and right hemispaces. Results were consistent with the prediction: Visual adaptation transfer and additivity occurred when the nondominant left hand was exposed but not when the dominant right hand was exposed. Visual straight-ahead asymmetry appeared when the dominant right hand was exposed to leftward displacement. The authors discuss the implications for the general theory of prism adaptation.
作者们推测，视觉适应无法从个体暴露的右手转移到未暴露的左手，是由于眼手协调中的半球不对称性，即优势眼-右手系统专门用于右侧身体空间的动作。实验分组接受暴露优势手或非优势手以及右侧或左侧棱镜位移的组合。在棱镜暴露（最终反馈）后，作者测量了双手本体感觉的正前方和正前方目标指向的后效。他们从左右半空间开始测量视觉正前方后效。结果与预测一致：当非优势左手暴露时发生了视觉适应转移和叠加，但优势右手暴露时则未发生。当优势右手暴露于向左位移时，出现了视觉正前方不对称。作者们讨论了这些结果对棱镜适应一般理论的意义。
