A Diffusion Model For Intersensory Facilitation of Reaction Time

  • Adele Diederich
Part of the Recent Research in Psychology book series (PSYCHOLOGY)


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.


Diffusion Model Transition Matrix Intensity Parameter Residual Time Drift Coefficient 
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Copyright information

© Springer-Verlag New York, Inc. 1994

Authors and Affiliations

  • Adele Diederich
    • 1
  1. 1.Fachbereich PhysikC.v.Ossietzky Universität OldenburgOldenburgGermany

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