Submission 615
Neural Correlates of Asymmetric Switch Costs During Affective Task Switching
SymposiumTalk-03
Presented by: Leif Erik Langsdorf
Task switching is widely used to investigate cognitive control, typically revealing switch costs reflected in increased response times in switch compared to repetition trials. Previous research reported larger costs when switching towards an affective task, compared with a switch towards a neutral task. This asymmetry can be explained by the inhibition of the affective task, which enables the performance of the neutral task. So far, we lack a clear understanding of how this affective processing asymmetry is neurally implemented. In Experiment 1, we therefore examined whether affective task content interferes with the initiation of the switching process, before stimulus onset, as reflected in preparatory event-related potential components. In Experiment 2, we investigated whether the maintenance of task sets is likewise modulated by affective task content, as reflected in neural mixing costs (repetition – single-task performance). Therefore, we asked participants to complete a cued task-switching during electroencephalographic recording, judging either the gender (neutral-task) or emotional expression (affective-task) of faces. For Experiment 1, neurally, within the cue-stimulus-interval, the switch-related posterior positivity was reduced in the affective compared to the neutral task, coinciding with increased switch costs toward the affective task. This suggests that affective task content interferes with preparatory processes before stimulus onset. For Experiment 2, neurally, within the cue-stimulus interval, the mixing-related centroparietal positivity remained unchanged by affective task content, mirrored behaviourally by symmetrical mixing costs. These findings indicate that affective task content selectively interferes with the initiation of the switching process before stimulus onset but not with maintaining the task-sets.