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Post-conflict slowing after incongruent stimuli: from general to conflict-specific

Abstract

Encountering a cognitive conflict not only slows current performance, but it can also affect subsequent performance, in particular when the conflict is induced with bivalent stimuli (i.e., stimuli with relevant features for two different tasks) or with incongruent trials (i.e., stimuli with relevant features for two response alternatives). The post-conflict slowing following bivalent stimuli, called “bivalency effect”, affects all subsequent stimuli, irrespective of whether the subsequent stimuli share relevant features with the conflict stimuli. To date, it is unknown whether the conflict induced by incongruent stimuli results in a similar post-conflict slowing. To investigate this, we performed six experiments in which participants switched between two tasks. In one task, incongruent stimuli appeared occasionally; in the other task, stimuli shared no feature with the incongruent trials. The results showed an initial performance slowing that affected all tasks after incongruent trials. On further trials, however, the slowing only affected the task sharing features with the conflict stimuli. Therefore, the post-conflict slowing following incongruent stimuli is first general and then becomes conflict-specific across trials. These findings are discussed within current task switching and cognitive control accounts.

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Fig. 1
Fig. 2

Notes

  1. In the present study, participants were instructed to perform each task twice in succession (see Fig. 1). This results in switch and repetition trials which allows to examine whether responding to incongruent stimuli affects switch and repetition trials differentially, and thus contributes to switch costs (i.e., the slower performance on switch compared to repetition trials). We carried out all the analyses including switch vs. repetition as an additional independent variable. Overall, this resulted in the same pattern of findings.

  2. In the analyses of the impact of incongruent trials on subsequent congruent trials, we focussed on reaction times data because accuracy on univalent and congruent trials was close to ceiling (mean accuracy 98 %) and even at ceiling in some conditions (see “Appendix”).

  3. This may explain why the congruency effects were so large in the present study. It is possible that participants were slower on incongruent trials than on congruent trials not only because incongruent trials induced a conflict between two response alternatives but also because they induced an orienting response due to their infrequent occurrence.

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Acknowledgments

This work was supported by the Center for Cognition, Learning, and Memory, University of Bern, Switzerland. We thank Anne-Catherine Amstutz, Rahel Gfeller, Eva Gut, Tiffany Jacob, Melanie Künzli, Isabelle Marti, Seline Messmer, Sabrina Schmied, and Michèle Spichtig for testing the participants. We also thank Michel Druey for helpful comments on an earlier version.

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Correspondence to Alodie Rey-Mermet.

Appendix

Appendix

See Table 6.

Table 6 Mean reaction times (in ms) and mean accuracy rates on digit identifications and colour/letter decisions for the trial sequences N + 1 until N + 4

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Rey-Mermet, A., Meier, B. Post-conflict slowing after incongruent stimuli: from general to conflict-specific. Psychological Research 81, 611–628 (2017). https://doi.org/10.1007/s00426-016-0767-0

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Keywords

  • Prospective Memory
  • Congruency Effect
  • Incongruent Trial
  • Colour Word
  • Congruent Trial