Asymmetric switch cost: An investigation using lateralized readiness potentials

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  • 切り替えコストの非対称性―片側性準備電位による検討―
  • キリカエ コスト ノ ヒタイショウセイ ヘンソクセイ ジュンビ デンイ ニ ヨル ケントウ

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Abstract

Switching to a dominant task incurs larger costs than switching to a non-dominant task. This study investigated whether this cost asymmetry derives from the inhibition of the dominant task rule that occurred during the previous trial. Participants were presented with a five-letter array consisting of _??_ (left) and _??_ (right), _??_, _??_, _??_, and _??_, and asked to respond to the central target letter after being informed about the task rule with a pre-cue. The rule was switched between dominant (left-hand to _??_, right-hand to _??_) and non-dominant tasks (right-hand to _??_, left-hand to _??_) every two trials. Reaction times revealed the asymmetrical switch cost and the effect of target-flanker congruency. Stimulus-locked lateralized readiness potentials showed that the dominant task rule was inhibited during the non-dominant task, whereas this inhibition was not carried over to the dominant task trial.

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