ISSN : 1226-9654
In selective attention tasks such as the Stroop or flanker tasks, performance on the current trial is modulated by trial sequence. This is referred to as the conflict adaptation (CA) effect, which is used for a measurement of cognitive control. Various theoretical accounts have been proposed to explain the CA effect in a top-down or bottom-up manner. In a top-down attentional modulation view, the conflict monitoring theory suggests reactive control whereas a expectation-based account proposes proactive control. These have different assumption in the time-course of the CA effect. In the present study, we used a relatively difficult version of the Stroop task to investigate whether the CA effect is influenced by temporal operation in the light of proactive control. In the Experiment 1 and 2, diverse inter-stimulus intervals were randomly presented in the tasks. The result showed that the CA effect could occur proactively when the processing time was sufficient. In the Experiment 3, we manipulated the inter-stimulus intervals in the block design to facilitate participants' anticipation of the stimulus presentation time. The results demonstrated that proactive control could be enhanced due to the expectation effect. Our findings suggest that the CA effect could occur through proactive control according to the nature of tasks. In addition, proactive control appears to operate more efficiently when processing time is enough and prediction of the stimulus onset is easy.
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