Pierson-Savage J M, Bradshaw J L
Department of Psychology, Monash University, Clayton, Victoria, Australia.
Perception. 1987;16(3):283-90. doi: 10.1068/p160283.
Vibrotactile reaction times in normal dextrals were measured for the two hands separately when either hand was located at each of seven possible positions: 90 degrees, 45 degrees, and 15 degrees to the left and right of the chest midline, and at the midline itself (0 degrees). Reaction times for the two hands did not differ and there was no Hand by Position interaction. At 90 degrees left, reaction times were significantly slower than at any other position except 45 degrees right. However, none of the other positions, including 45 degrees right, differed from each other. Performance in this task, therefore, was relatively uniform from 90 degrees right to 45 degrees left, but markedly slower at 90 degrees left. This far-left-side disadvantage may reflect a difficulty (for dextrals) in focussing covert attention in the far-left part of space for a block of trials. Since vibrotactile reaction times are sensitive to attentional factors in normal subjects, the paradigm should allow quantification of the clinical symptoms of the hemineglect syndrome; some preliminary observations of this syndrome with another vibrotactile design are reported.
当双手分别处于七个可能位置中的任何一个时，对正常右利手者的双手进行了振动触觉反应时间的测量：胸部中线左右90度、45度和15度，以及中线本身（0度）。双手的反应时间没有差异，也没有手与位置的交互作用。在左90度时，反应时间明显比除右45度以外的任何其他位置都要慢。然而，包括右45度在内的其他任何位置之间都没有差异。因此，从右90度到左45度，这项任务的表现相对一致，但在左90度时明显较慢。这种最左侧的劣势可能反映了（对于右利手者来说）在一组试验中，将隐蔽注意力集中在空间最左侧部分存在困难。由于振动触觉反应时间对正常受试者的注意力因素敏感，该范式应该能够对偏侧忽视综合征的临床症状进行量化；报告了用另一种振动触觉设计对该综合征的一些初步观察结果。
