Summary
Stimulus after-effects in the retinula and lamina cells of the crab are relatively brief and cannot explain the animals response to apparent motion.
Some off-neurons in the medulla show an increase of their response with increasing Exposure time. The optimum Exposure time for these neurons is between 4 and 13 s.
Neurons in the medulla can have lasting after-effects which decay exponentially during the dark time of an apparent motion stimulus, with the same time course as that exhibited by the behavioural response.
Long lasting after-effects and the dependence of off-responses on the Exposure time are characteristics of neurons with and without directional selectivity.
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Erber, J., Sandeman, D.C. The detection of real and apparent motion by the crabLeptograpsus variegatus . J. Comp. Physiol. 112, 189–197 (1976). https://doi.org/10.1007/BF00606538
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DOI: https://doi.org/10.1007/BF00606538