A Diffusion Model For Intersensory Facilitation of Reaction Time
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An experiment was conduced to test for intersensory facilitation of reaction time with stimuli from three modalities (visual, auditory, tactile). Stimuli from two or three modalities with different intensity levels were presented with different interstimulus intervals in a simple reaction time experiment. A diffusion model, called the “Ornstein-Uhlenbeck Process with Drift”, with one absorbing and one reflecting boundary, is presented to explain the observed facilitation of reaction time. Although no closed form is known for the diffusion equations for the case of an arbitrary boundary, numerical methods based on limits of discrete-time Markov chains provide practical approximations.
KeywordsDiffusion Model Transition Matrix Intensity Parameter Residual Time Drift Coefficient
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