PRESTIMULUS AND POSTSTIMULUS ACTIVATION OF RESPONSE CHANNELS - A PSYCHOPHYSIOLOGICAL ANALYSIS
PRESTIMULUS AND POSTSTIMULUS ACTIVATION OF RESPONSE CHANNELS - A PSYCHOPHYSIOLOGICAL ANALYSIS
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DOI：
10.1037/0096-1523.14.3.331
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发表时间：
1988-08-01
影响因子：
2.1
通讯作者：
DONCHIN, E
中科院分区：
文献类型：
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作者：
GRATTON, G;COLES, MGH;DONCHIN, E
为了研究反应激活的机制，我们要求受试者对四个阵列之一的中心字母HH H HH，SS H SS，SS S SS和HH S HH做出不同的反应，并测量事件相关脑电位（ERP）和肌电图活动（EMG）。对于非常快的反应，准确性是在所有阵列的机会水平，这表明受试者猜测。对于中间潜伏期的反应，准确性高于机会，如果噪音是兼容的目标和下面的机会，如果它是不兼容的，这表明这些反应是基于部分刺激分析。对于缓慢的反应，准确性高于所有阵列的机会，这表明这些反应是基于完整的刺激分析。快速反应的发生和准确性可以通过检查阵列呈现之前的运动电位来预测。运动电位的措施，在一段时间内提出的阵列表明，刺激信息的部分分析可以激活反应，并在EMG响应的时间响应激活的水平是恒定的，不同的反应延迟试验。数据进行了讨论的响应通道的概念。
To examine mechanisms of response activation, we asked subjects to respond differentially to the central letter of one of four arrays—HH H HH, SS H SS, SS S SS, and HH S HH—and measured event-related brain potentials (ERPs) and electromyographic activity (EMG). For very fast responses, accuracy was at chance level for all arrays, suggesting that subjects were guessing. For intermediate latency responses, accuracy was above chance if the noise was compatible with the targets and below chance if it was incompatible, suggesting that these responses were based on partial stimulus analysis. For slow responses, accuracy was above chance for all arrays, suggesting that these responses were based on complete stimulus analysis. The occurrence and accuracy of fast responses could be predicted by examining motor potentials preceding the presentation of the array. Measures of the motor potentials in the period following the presentation of the array suggested that partial analysis of stimulus information could activate responses and that the level of response activation at the time of the EMG response was constant for trials with different response latencies. The data are discussed in terms of a response channel conception.