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Abstract

We validated the stop-signal task (Lappin & Eriksen, 1966) in an online context with performance-based monetary bonus to incentivize active participation. Our study modified the current paradigm designed by Verbruggen, et al. (2019) following suggestions from their consensus guidelines. Stop-signal reaction time (SSRT), the primary measure from the task, has been shown to correlate with trait measures of impulsive personality to various degrees. Consistent with previous literature, our preliminary analysis revealed a strong correlation SSRT and two forms of impulsive personality (motor & attentional) measured by Barrat Impulsiveness Scale (BIS-11). Additionally, recent studies found that short (< 200ms) stop-signal delays (SSD) are more likely to result in violations of independence. Therefore, we also conducted analysis excluding trials with SSD less than 200ms according to their suggestions. Both analyses demonstrate a link between stop-signal reaction time (SSRT) and impulsive personality trait measured by the BIS-11. Analyses excluding trials less than 200ms (N = 73) found no significant correlation between attentional and nonplanning measures of impulsivity, although a strong correlation between SSRT and motor impulsivity (r = 0.39, p < 0.001) is still present. The stop-signal task is a promising tool awaiting further development and our research suggests that by employing a financial incentive to participate, the task can bridge the gap between self-reported impulsive traits and task-based measures of inhibitory failure.

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