Proactive Adjustments of Response Strategies in the Stop-Signal Paradigm

摘要

In the stop-signal paradigm, fast responses are harder to inhibit than slow responses, SO Subjects must balance speed is the go task with successful stopping in the stop task. In theory, subjects achieve this balance by adjusting response thresholds for the go task, making proactive adjustments in response to instructions that indicate that relevant stop signals are likely to Occur. The 5 experiments reported here tested this theoretical claim, presenting cues that indicated whether or not stop signals were relevant for the next few trials. Subjects made proactive response-strategy adjustment,., it) each experiment: Diffusion-model fits showed that response threshold increased when participants expected stop signals to occur. slowing go responses and increasing accuracy. Furthermore, the results Show that subjects can make proactive response-strategy adjustments on a trial-by-trial basis, suggesting it flexible cognitive system that can proactively adjust itself in changing environments.