EFFECTS OF CHOICE COMPLEXITY ON DIFFERENT SUBCOMPONENTS OF THE LATE POSITIVE COMPLEX OF THE EVENT-RELATED POTENTIAL
EFFECTS OF CHOICE COMPLEXITY ON DIFFERENT SUBCOMPONENTS OF THE LATE POSITIVE COMPLEX OF THE EVENT-RELATED POTENTIAL
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DOI：
10.1016/0168-5597(94)90055-8
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发表时间：
1994-03-01
期刊：
影响因子：
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通讯作者：
HOORMANN, J
中科院分区：
文献类型：
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作者：
FALKENSTEIN, M;HOHNSBEIN, J;HOORMANN, J
研究了选择复杂性对晚期正复合体不同子成分的影响。在以前的选择反应研究中，这个复合物的两个子组件被确定，称为P-SR和P-CR，这似乎是与刺激评估和反应选择，分别。本研究试图通过操纵反应选择的复杂性来显示P-CR对反应选择的依赖性（以及P-SR的独立性）。这是通过让受试者对单个字母刺激进行双向或四向选择反应来完成的。为了提高P-SR和P-CR的区分度，使用视觉和听觉刺激，因为P-SR是模态依赖的。此外，刺激方式是混合的（“分散注意范式”），这预计会导致P-SR和P-CR的分离，特别是在听觉刺激后。主要的ERP结果是，与简单选择相比，困难选择的P-CR潜伏期增加了65 msec，而P-SR潜伏期保持不变。P-CR潜伏期差异与偏侧准备电位的起始差异完全匹配。P-SR表现出模态依赖的潜伏期和地形图，而P-CR没有。目前的数据证实了一个子成分的晚期积极复杂，P-CR，认知反应选择过程的密切关系。
The effects of choice complexity on different subcomponents of the late positive complex were investigated. In a previous choice reaction study, two subcomponents of this complex were identified, called P-SR and P-CR, which seem to be related to stimulus evaluation and response selection, respectively. The present study attempts to show the dependence of the P-CR (and the independence of the P-SR) on response selection by manipulating response selection complexity. This was done by having the subjects perform either 2-way or 4-way choice reactions to single letter stimuli. To enhance the discriminability of P-SR and P-CR, visual and auditory stimuli were used, since the P-SR is modality-dependent. Moreover, the stimulus modalities were mixed (''divided attention paradigm''), which was expected to lead to a dissociation of P-SR and P-CR, especially after auditory stimuli.The choice reaction times were about 100 msec longer for difficult than for easy choices. The main ERP result was a 65 msec increase of the P-CR latency for the difficult as compared to the easy choice, while the P-SR latency remained constant. The P-CR latency difference precisely matched the onset difference of the lateralized readiness potential. The P-SR showed a modality-dependent latency and topography, while the P-CR did not. The present data confirm the close relation of one subcomponent of the late positive complex, the P-CR, to the cognitive response-selection process.