In a task-switching paradigm, usual response-repetition benefits are replaced by response-repetition costs when the task switches. Inhibition of a previous response and mismatch interference induced by response-repetition have been proposed as sources of negative response-repetition effects by the response inhibition account and episodic binding and retrieval model, respectively. The present study utilized electroencephalograph (EEG) to investigate the mechanism underlying negative response-repetition effects. Lateralized enhancements in the upper-alpha and beta bands served as indexes of response inhibition, and significant lateralized beta enhancements appeared after the previous response execution. About 500–600 ms after the onset of current stimuli, event-related potentials presented significant response-repeat negativity in the task-switch sequence, indicating the occurrence of mismatch interference induced by response repetition. Moreover, lateralized beta enhancements and response-repeat negativity were each positively related to behavioral negative response-repetition effects. These results suggest that both response inhibition and mismatch interference induced by response repetition make contributions to negative response-repetition effects.

在任务切换范例中，当任务切换时，通常的响应-重复收益被响应-重复成本所代替。先前的抑制和由反应重复引起的失配干扰已被分别认为是反应抑制账户和情节结合与检索模型的负面反应重复效应的来源。本研究利用脑电图仪（EEG）来研究负响应重复效应的潜在机制。上α和β带的横向增强是反应抑制的指标，并且在先前的反应执行后出现了明显的横向β增强。当前刺激发作后约500–600毫秒，事件相关电位在任务切换序列中呈现出显着的响应-重复负性，表明发生了响应重复引起的错配干扰。此外，侧向β增强和反应重复负性都与行为负反应重复效应正相关。这些结果表明，响应抑制和响应重复引起的错配干扰都对负的重复响应产生了影响。