A tandem random walk model for psychological discrimination


Department of Psychology, The University of Newcastle, New South Wales 2308, Australia.


A random walk model for decision making in psychological discrimination tasks is described which provides a satisfactory account of the observed non-stationarity of the representation of stimulus information. The model successfully predicts the relationship between RT and response proportion in a temporal order judgement task performed under instructions emphasizing both speed and accuracy. The implications of the model for memory-dependent tasks are discussed.