Random-walk and accumulator models of psychophysical discrimination: a critical evaluation.
The accumulator model proposed by Vickers and the modified random-walk model proposed by Link and Heath are compared in their ability to account for confidence judgments in line-length discrimination tasks. The random-walk model proves to be a viable alternative to the accumulator model, and is able to account for the relationship between mean response time and confidence. The parameter estimation techniques available for the random-walk model are considered advantageous when compared with the accumulator model, because the predictions from the latter have been obtained with the use of computer simulation.
D003201:Computers; D004193:Discrimination Learning; D005556:Form Perception; D006801:Humans; D011601:Psychophysics; D011930:Reaction Time; D012858:Size Perception