Abstract
Performing several actions simultaneously usually yields interference, which is commonly explained by referring to theoretical concepts such as crosstalk and structural limitations associated with response selection. While most research focuses on dual-task scenarios (involving two independent tasks), we here study the role of response selection and crosstalk for the control of cross-modal response compounds (saccades and manual responses) triggered by a single stimulus. In two experiments, participants performed single responses and spatially compatible versus incompatible dual-response compounds (crosstalk manipulation) in conditions with or without response selection requirements (i.e., responses either changed randomly between trials or were constantly repeated within a block). The results showed that substantial crosstalk effects were only present when response (compound) selection was required, not when a pre-selected response compound was merely repeated throughout a block of trials. We suggest that cross-response crosstalk operates on the level of response selection (during the activation of response codes), not on the level of response execution (when participants can rely on pre-activated response codes). Furthermore, we observed substantial residual dual-response costs even when neither response incompatibility nor response selection requirements were present. This suggests additional general dual-execution interference that occurs on a late, execution-related processing stage and even for two responses in rather distinct (manual and oculomotor) output modules. Generally, the results emphasize the importance of considering oculomotor interference in theorizing on multiple-action control.
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Notes
We decided to report here the direct comparison of the incompatible conditions from both experiments. Additionally, we computed an analysis including the R–R incompatible condition of Experiment 2 with the R–R compatible condition of Experiment 1 (analogous to Experiment 1 analyses). The results do not contradict the findings in Experiment 1. Importantly, our main finding in Experiment 1, namely the interaction of response condition, RS, and R–R compatibility, was replicated showing that crosstalk has a larger impact on dual-response interference under increased RS demands and therefore operates rather on the level of RS than on the level of response execution.
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Acknowledgements
The authors thank Andrea Zahn, Verena Maag, and Marvin Liesner for the collection of the data and those who participated in the study. The present research was funded by the Deutsche Forschungsgemeinschaft (HU 1847/3-1).
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Pieczykolan, A., Huestegge, L. Sources of interference in cross-modal action: response selection, crosstalk, and general dual-execution costs. Psychological Research 82, 109–120 (2018). https://doi.org/10.1007/s00426-017-0923-1
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DOI: https://doi.org/10.1007/s00426-017-0923-1