Fischer Martin H, Pratt Jay, Adam Jos J
School of Psychology, University of Dundee, Dundee, UK.
Exp Brain Res. 2007 Oct;183(1):127-32. doi: 10.1007/s00221-007-1104-z. Epub 2007 Sep 8.
This study investigated the time course and automaticity of spatial coding of visual targets for pointing movements. To provide an allocentric reference, placeholders appeared on a touch screen either 500 ms before target onset, or simultaneously with target onset, or at movement onset, or not at all (baseline). With both blocked and randomized placeholder timing, movements to the most distant targets were only facilitated when placeholders were visible before movement onset. This result suggests that allocentric target coding is most useful during movement planning and that this visuo-spatial coding mechanism is not sensitive to strategic effects.
本研究调查了指向动作视觉目标空间编码的时间进程和自动性。为了提供一个以自我为中心的参照，占位符在目标出现前500毫秒、与目标同时出现、在动作开始时出现在触摸屏上，或者根本不出现（基线）。无论是采用分块还是随机的占位符时间安排，只有当占位符在动作开始前可见时，向最远目标的动作才会得到促进。这一结果表明，以自我为中心的目标编码在动作规划过程中最有用，并且这种视觉空间编码机制对策略效应不敏感。
