Ivry R B, Franz E A, Kingstone A, Johnston J C
Department of Psychology, University of California, Berkeley 94720, USA.
J Exp Psychol Hum Percept Perform. 1998 Apr;24(2):463-80. doi: 10.1037//0096-1523.24.2.463.
A callosotomy patient was tested in 2 dual-task experiments requiring successive speeded responses to lateralized stimuli. The patient showed a robust psychological refractory period (PRP) effect. Three aspects of the data indicate that, unlike for the control participants, the PRP effect for the split-brain patient should not be attributed to a response selection bottleneck. First, the patient did not show an increase in reaction time (RT) when the 2 tasks required responses from a common output system compared with when different output systems were used. Second, inconsistent stimulus-response mappings for the 2 tasks increased RTs for the control participants but had minimal effect on the performance of the split-brain patient. Third, the consistency manipulation was underadditive with stimulus onset asynchrony but was additive or overadditive for the normal participants. These results suggest that the persistent PRP effect following callosotomy should be attributed to a bottleneck associated with response initiation, a strategy adopted to comply with the task demands, or a combination of these factors.
一名胼胝体切开术患者在两项双任务实验中接受测试，这两项实验要求对侧化刺激做出连续的快速反应。该患者表现出强烈的心理不应期（PRP）效应。数据的三个方面表明，与对照组参与者不同，裂脑患者的PRP效应不应归因于反应选择瓶颈。首先，与使用不同输出系统时相比，当两项任务需要来自同一输出系统的反应时，该患者的反应时间（RT）并未增加。其次，两项任务不一致的刺激-反应映射增加了对照组参与者的反应时间，但对裂脑患者的表现影响极小。第三，一致性操作与刺激开始异步性的组合效应小于相加，但对正常参与者来说是相加或超相加的。这些结果表明，胼胝体切开术后持续存在的PRP效应应归因于与反应启动相关的瓶颈、为符合任务要求而采用的策略或这些因素的组合。
