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CCN Brown Bag Series

Wednesday, October 18, 2017,
  • Location: Wilson Hall
  • Room: Room 115

Gabriel Tillman, PhD

Department of Psychology

Vanderbilt University

“The Racing Diffusion Model of Speeded Decision Making"


We describe and test a simple sequential sampling model of N-choice speeded decision

making: the racing diffusion model. The model makes speeded decisions from a race of

evidence accumulators that integrate information in a noisy fashion within a trial.

Unlike many current sequential sampling models, the racing diffusion does not assume

that evidence accumulation rate varies between trial, and so, the model provides

alternative explanations of key response time (RT) phenomena, such as fast and slow

error RTs relative to correct RTs. Applying the racing diffusion model is relatively fast

and easy given the analytic solution to the likelihood of response times, yet the model

contains processing dynamics that may be of interest to cognitive-neuroscientist. The

racing diffusion is an alternative to simple sequential sampling models that do without

within-trial drift variability and complex models that include this variability, but are

difficult to implement."