- Location: Wilson Hall
- Room: Room 115
- Contact: Angel Gaither
- Email: firstname.lastname@example.org
- Phone: (615) 322-0080
- Audience: Free and Open to the Public
Gabriel Tillman, PhD
Department of Psychology
“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."