Khateb A, Pegna A J, Michel C M, Custodi M C, Landis T, Annoni J M
Geneva University Hospital, Switzerland.
Laterality. 2000 Jan;5(1):35-53. doi: 10.1080/713754355.
In this study, the question of hemispheric abilities in processing explicit semantic and phonological information was addressed by measuring response latencies and performances in two judgement tasks. In the semantic task, word pairs were sequentially presented to the left or right visual field and subjects were asked to judge whether these words were categorically related or not. In the phonological task, the same subjects were asked to decide whether pairs of orthographically dissimilar words rhymed or not. Statistical analysis showed that reaction times (RT) were significantly shorter in both tasks when words were presented to the right visual field. Furthermore, in the semantic task, faster responses were observed in both visual fields when the words were related than when they were unrelated. This response facilitation tended to be stronger when words were presented to the left visual field. This result is in accordance with other results obtained by lexical decision studies showing that priming in the right hemisphere is due to controlled processing. By contrast, RT differences between rhyming and non-rhyming word pairs in the phonological task did not reach significance. This supports previous findings showing that phonological facilitation cannot occur when orthographic and phonological indices are in conflict.
在本研究中，通过测量两项判断任务中的反应潜伏期和表现，探讨了大脑半球在处理明确语义和语音信息方面的能力问题。在语义任务中，单词对依次呈现给左视野或右视野，要求受试者判断这些单词在类别上是否相关。在语音任务中，要求相同的受试者判断拼写不同的单词对是否押韵。统计分析表明，当单词呈现给右视野时，两项任务的反应时间（RT）均显著缩短。此外，在语义任务中，当单词相关时，两个视野的反应都比不相关时更快。当单词呈现给左视野时，这种反应促进作用往往更强。这一结果与词汇判断研究获得的其他结果一致，表明右半球的启动是由于控制性加工。相比之下，语音任务中押韵和不押韵单词对之间的RT差异不显著。这支持了先前的研究结果，即当正字法和语音指标冲突时，语音促进作用不会发生。
