title: Diffusive information accumulation by minimal recurrent neural models of decision making.
abstract: An important class of psychological models of decision making assumes that evidence is accumulated by a diffusion process to a response criterion. These models have successfully accounted for reaction time (RT) distributions and choice probabilities from a wide variety of experimental tasks. An outstanding theoretical problem is how the integration process that underlies diffusive evidence accumulation can be realized neurally. Wang ( 2001 , 2002 ) has suggested that long timescale neural integration may be implemented by persistent activity in reverberation loops. We analyze a simple recurrent decision making architecture and show that it leads to a diffusive accumulation process. The process has the form of a time-inhomogeneous Ornstein-Uhlenbeck velocity process with linearly increasing drift and diffusion coefficients. The resulting model predicts RT distributions and choice probabilities that closely approximate those found in behavioral data.
authors.affiliation: Psychological Sciences, University of Melbourne, Victoria, Australia. philipls@unimelb.edu.au
authors.forename: Philip L
authors.initials: PL
authors.lastname: Smith
authors.forename: Cameron R L
authors.initials: CR
authors.lastname: McKenzie
mesh_terms: D000465:Algorithms; D000818:Animals; D001921:Brain / Q000502:physiology*; D003657:Decision Making / Q000502:physiology*; D006801:Humans; D008959:Models, Neurological; D008962:Models, Theoretical; D011930:Reaction Time / Q000502:physiology*