Wright R D
Department of Psychology, Simon Fraser University, Burnaby, B.C., Canada.
Can J Exp Psychol. 1994 Jun;48(2):205-17. doi: 10.1037/1196-1961.48.2.205.
Single and simultaneous multiple location cues were presented a brief period of time before the onset of targets that observers were required to identify. Single and multiple cueing effects were similar, even when targets were presented at locations "in between" pairs of cues. This implies that pairs of direct stimulus cues are not processed by an attentional focus of variable spatial extent that encompasses both cued locations. If this were the case, then targets presented in between cued locations would fall within such an attentional focus and identification response times should have been reduced. The increase in these response times that actually occurred when a target was presented at uncued locations in between a pair of cued locations suggests that pairs of cued locations are encoded independently by an operation called spatial indexing. A multiple indexing proposal and its role in mediating visual attention shifts initiated by direct stimulus cues is described.
在观察者需要识别的目标出现之前的短时间内，呈现单个和同时多个位置线索。即使目标出现在一对线索的“中间”位置，单个和多个线索效应也是相似的。这意味着一对直接刺激线索不是由包含两个线索位置的可变空间范围的注意力焦点来处理的。如果是这样的话，那么出现在线索位置之间的目标就会落入这样一个注意力焦点内，识别反应时间就会缩短。当目标出现在一对线索位置之间的未提示位置时实际出现的这些反应时间的增加表明，一对线索位置是通过一种称为空间索引的操作独立编码的。本文描述了一种多重索引提议及其在介导由直接刺激线索引发的视觉注意力转移中的作用。
