Changes in expectation consequent on experience, modeled by a simple, forgetful neural circuit.
Our expectation of an event such as a visual stimulus clearly depends on previous experience, but how the brain computes this expectation is currently not fully understood. Because expectation influences the time to respond to a stimulus, we arranged for the probability of a visual target to suddenly change and found that the time taken to make an eye movement to it then changed continuously, eventually stabilizing at a level reflecting the new probability. The time course of this change can be modeled making a simple assumption: that the brain discounts old information about the probability of an event by a factor lambda, relative to new information. The value of lambda presumably represents a compromise between responding rapidly to genuine changes in the environment and not prematurely discarding information still of value. The model we propose may be implemented by a very simple neural circuit composed of only a few neurons.
Anderson
Andrew J
AJ
Department of Optometry and Vision Sciences, The University of Melbourne, Melbourne, Australia. aaj@unimelb.edu.au
Carpenter
R H S
RH
D000328:Adult; D005133:Eye Movements / Q000502:physiology*; D006801:Humans; D016013:Likelihood Functions; D008959:Models, Neurological; D010775:Photic Stimulation / Q000379:methods*; D014785:Vision, Ocular / Q000502:physiology*; D014795:Visual Pathways / Q000502:physiology*