Objective: The present research tests the effects of time pressure and noise on openmindedness to discover new problem-solving strategies. Background: We are primarily interested in transfer of skill from one phase to the next. More specifically, this study investigates whether the presence of stressors makes participants adhere to the sustained use of complex rules. Method: Participants learned to apply a complex rule in the first phase of a category learning task. In the second phase, this rule became dysfunctional and participants had to search for a new categorization rule in order to assign the stimuli to the correct classes. Two experiments were set up to investigate this issue. Results: Participants were found to have difficulty discovering a complex Phase 2 rule in the presence of stressors, whereas the discovery of a simple rule was not hindered by the presence of stressors. Conclusion: In the discussion, it is argued that the present results are compatible with previous research on stressors showing that time pressure and noise induce the application of simple strategies. The innovative finding here is that this simplification also occurs in individuals who are accustomed to using complex solutions. Application: The implications of the present results for emergency response training are elaborated upon.
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