Nicoletti R, Anzola G P, Rizzolatti G, Umiltà C
Boll Soc Ital Biol Sper. 1980 Jul 15;56(13):1426-31.
Choice reaction times of two lateralized unstructured visual stimuli located within the same (right or left) visual hemifield were studied in subjects with hands crossed and uncrossed. The subjects were instructed to respond with their right or left hand depending on the position of the stimulus. In one experimental condition they have to use their right hand for responding to the right light and their left hand for responding to the left light. In another experimental condition the reverse arrangement was used. The two light stimuli were presented, one at a time and 3 degrees apart, in both visual fields. Thus, the analyzed factors were: hand position (crossed or uncrossed), responding hand (right or left), field of presentation (right or left), and relative position of the light stimulus (right or left). The main finding of the present study was that spatial compatibility effects were present even when both stimuli were presented within the same visual field. That means that the factor determining which hand is faster in responding is the relative position of the two stimuli and of the two hands and not the position of the stimuli with reference to the vertical meridian.
在双手交叉和不交叉的受试者中，研究了位于同一（右侧或左侧）视觉半视野内的两种侧向无结构视觉刺激的选择反应时间。受试者被指示根据刺激的位置用右手或左手做出反应。在一种实验条件下，他们必须用右手对右侧的光做出反应，用左手对左侧的光做出反应。在另一种实验条件下，使用相反的安排。两个光刺激分别呈现，每次一个，在两个视野中相隔3度。因此，分析的因素有：手的位置（交叉或不交叉）、做出反应的手（右手或左手）、呈现视野（右侧或左侧）以及光刺激的相对位置（右侧或左侧）。本研究的主要发现是，即使两个刺激都在同一视野内呈现，空间兼容性效应也存在。这意味着决定哪只手反应更快的因素是两个刺激和两只手的相对位置，而不是刺激相对于垂直子午线的位置。
