Traditional models of choice-response time assume that sensory evidence accumulates for choice alternatives until a threshold amount of evidence has been obtained. Although some researchers have characterized the threshold as varying randomly from trial to trial, these investigations have all assumed that the threshold remains fixed across time within a trial. Despite decades of successful applications of these models to a variety of experimental manipulations, the time-invariance assumption has recently been called into question, and a time-variant alternative implementing collapsing decision thresholds has been proposed instead. Here, we investigated the fidelity of the collapsing threshold assumption by assessing relative model fit to data from a highly constrained experimental design that coupled a within-subject mixture of two classic response time paradigms-interrogation and free response-within a random dot motion (RDM) task. Overall, we identified strong evidence in favor of collapsing decision thresholds, suggesting that subjects may adopt a dynamic decision policy due to task characteristics, specifically to account for the mixture of response time paradigms and motion strengths across trials in the mixed response signal task. We conclude that time-variant mechanisms may serve as a viable explanation for the strategy used by human subjects in our task.

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A clear inverse relationship exists between efficacy and anxiety and anxiety and performance in mathematics. However, efficacy is domain- and task-specific, so the role that specific types of efficacy play in the anxiety-performance relationship is less clear. Emotional self-efficacy moderates this relationship in children, but research has not yet examined its role with math anxiety and performance in undergraduate students who have more developed emotional regulation. Further, understanding the role of self-efficacy for different tasks (i.e., efficacy for math versus for emotion regulation) is important to understanding math anxiety and how to intervene for math anxious individuals. Therefore, the purpose of the current study was to explore the moderating and/or mediating role of both math self-efficacy and emotional self-efficacy in undergraduate students using indirect effects analyses. One hundred and fifteen students at a mid-sized state university in the Midwest United States completed self-report measures of emotional self-efficacy, math self-efficacy, and math anxiety before completing a standardized measure of math performance. Results of indirect effects analyses determined that math self-efficacy had an indirect effect on the anxiety-performance relationship while emotional self-efficacy had neither indirect nor moderating effects on the math anxiety-performance relationship.

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