title: [Asymmetric switch cost: an investigation using lateralized readiness potentials].
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 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.
authors.affiliation: Department of Home and Life Sciences, Gifu Women's University, Taromaru, Gifu 501-2592, Japan. kaoru@gijodai.ac.jp
authors.forename: Kaoru
authors.initials: K
authors.lastname: Umebayashi
authors.forename: Tsunetaka
authors.initials: T
authors.lastname: Okita
mesh_terms: D000328:Adult; D003265:Contingent Negative Variation / Q000502:physiology*; D004292:Dominance, Cerebral / Q000502:physiology*; D005071:Evoked Potentials; D005260:Female; D006801:Humans; D008297:Male; D011930:Reaction Time