Lambert A, Voot N
Department of Psychology, University of Auckland, New Zealand.
Neuropsychologia. 1993 Jan;31(1):67-73. doi: 10.1016/0028-3932(93)90081-a.
Previous studies have shown that verbal processing in both normal individuals and a split-brain patient can be strongly affected by the semantic category of an unattended word presented to the left visual field (LVF). The effect was interpreted in terms of inhibition, since responses were slower when the unattended LVF word belonged to the same category as the target word. The present experiment discriminated between two alternative explanations for this finding. Subjects were presented with two letter strings, one in central vision and one to the left or right of centre. Subjects made a speeded lexical decision to the central string, and were instructed to ignore the lateral string. When a word was presented to the LVF subjects responded more slowly when it was semantically related to the central word. When an unattended word was presented to the RVF, its semantic relationship to the central word had no effect on decision latency. This finding is discussed in relation to views of performance laterality and selective attention.
先前的研究表明，正常人和裂脑患者的言语加工都会受到呈现给左视野（LVF）的未被注意单词的语义类别的强烈影响。由于当未被注意的LVF单词与目标单词属于同一类别时反应较慢，所以该效应被解释为抑制作用。本实验对这一发现的两种替代解释进行了区分。向受试者呈现两个字母串，一个在中央视野，另一个在中央的左侧或右侧。受试者对中央字母串进行快速词汇判断，并被指示忽略旁边的字母串。当一个单词呈现给LVF时，如果它与中央单词语义相关，受试者的反应会更慢。当一个未被注意的单词呈现给右视野（RVF）时，它与中央单词的语义关系对判断潜伏期没有影响。结合表现的偏侧性和选择性注意的观点对这一发现进行了讨论。
