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A biologically plausible model of early visual motion processing I: Theory and implementation

Abstract

A model of local image encoding is described which explicitly incorporates quantitative data about the number density, bandwidth and receptive field organisation of neurons involved in motion detection. The model solves the problem of extracting local velocity on the basis of inputs tuned to spatiotemporal frequency and sensitive to contrast. The spatiotemporally tuned, opponent motion filters are followed by a compressive non-linearity and comprise a first stage. The inter-stage signals are interpreted as those from single neurons and the second stage is modelled as a neural-network layer. The second stage uses semilinear units and models the effect of lateral, on-centre off-surround, intralayer connections. Characterisation of the first stage leads to a clarification of the concept of the psychophysical ‘channel’ and its relation to physiological data. The quantitative parametrisation of the model allows the simulation of several psychophysical phenomena which are reported in a companion paper.

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Correspondence to K. Gurney.

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Gurney, K., Wright, M.J. A biologically plausible model of early visual motion processing I: Theory and implementation. Biol. Cybern. 74, 339–348 (1996). https://doi.org/10.1007/BF00194926

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Keywords

  • Receptive Field
  • Clarification
  • Single Neuron
  • Companion Paper
  • Motion Detection