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Set-shifting as a component process of goal-directed problem-solving

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Abstract

In two experiments, we compared secondary task interference on Tower of London performance resulting from three different secondary tasks. The secondary tasks were designed to tap three different executive functions, namely set-shifting, memory monitoring and updating, and response inhibition. Previous work using individual differences methodology suggests that, all other things being equal, the response inhibition or memory tasks should result in the greatest interference. However, this was not found to be the case. Rather, in both experiments the set-shifting task resulted in significantly more interference on Tower of London performance than either of the other secondary tasks. Subsequent analyses suggest that the degree of interference could not be attributed to differences in secondary task difficulty. Results are interpreted in the light of related work which suggests that solving problems with non-transparent goal/subgoal structure requires flexible shifting between subgoals—a process that is held to be impaired by concurrent performance of a set-shifting task.

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Notes

  1. Because of substantial skewness in some of the dependent measures, excess moves was square root transformed prior to analysis, while first move time and time per subsequent move were log transformed. The sphericity assumption was violated for the ANOVA for time per subsequent move, and so Greenhouse–Geisser corrections to degrees of freedom have been made for the analysis of variance of this measure.

  2. Recall that in all cases the baseline condition was performed before the dual-task conditions, but that the order of dual-task conditions was counterbalanced over participants. Performance of the primary task on the dual-task conditions therefore potentially benefits from prior practice on the single-task condition but suffers from the requirement to concurrently perform a secondary task. It is consequently not possible to interpret pairwise comparisons between the baseline condition and each dual-task condition.

  3. The difference between the dependent variable values in the baseline condition and the experimental conditions is presumably due to a combination of the baseline condition being easier because it does not involve dual-tasking, but harder because it is unfamiliar. Recall that the baseline condition was completed first by all participants but order of the three dual-task conditions was counterbalanced, so the dependent variables across the dual-task conditions are directly comparable.

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Acknowledgments

We are grateful to Eddy J. Davelaar and Karolina Wutke for assistance with some aspects of the design of the study reported here, and to Karolina Wutke and Toni Saint for assistance with the data collection. We are also grateful to Christoph P. Kaller and an anonymous reviewer for highly constructive feedback on an earlier version of this manuscript. This work was partly funded by a Faculty Research Grant from the Faculty of Science, Birkbeck, University of London, to Richard P. Cooper. All experimental work was approved by the departmental ethics committee prior to initiation and carried out in accordance with the declaration of Helsinki. Verity Marsh is now at Queen Elizabeth Hospital, Lewisham and Greenwich NHS Trust. Please address correspondence to Richard P. Cooper (R.Cooper@bbk.ac.uk).

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Appendix: ToL problems used in experiments 1 and 2

Appendix: ToL problems used in experiments 1 and 2

See Figs. 5 and 6

Fig. 6
figure 6

The two practice and six experimental Tower of London problems used in experiment 2, using greyscale for ball colour. All problems have partially ambiguous goal states, but the problems differ in various other respects, including the number of options available for the initial move and whether one of those options involves moving a ball to its goal position. As in experiment 1, mapping of shades of grey to colours of the balls as presented to participants (red, green and blue) was randomised on each block so that participants did not become familiar with the problems

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Cooper, R.P., Marsh, V. Set-shifting as a component process of goal-directed problem-solving. Psychological Research 80, 307–323 (2016). https://doi.org/10.1007/s00426-015-0652-2

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