Biological Cybernetics

, Volume 51, Issue 4, pp 213–222 | Cite as

A model for direction selectivity in threshold motion perception

  • Hugh R. Wilson


Thresholds were measured for a moving line superimposed on moving sinusoidal gratings. When line and grating moved in the same direction significant subthreshold summation was observed over a range of spatial frequencies. For motion of the line and grating in opposite directions, summation was never observed. This supports the hypothesis that direction selective mechanisms are responsible for motion perception at threshold. Further analysis of the data produced estimates of the spatial frequency tuning of these mechanisms. A quantitative model is proposed to interpret the data, and it is suggested that flickering gratings are not decomposed into their moving components by the visual system.


Opposite Direction Visual System Spatial Frequency Quantitative Model Frequency Tuning 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • Hugh R. Wilson
    • 1
  1. 1.Department of Biophysics and Theoretical BiologyUniversity of ChicagoChicagoUSA

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