Journal of Comparative Physiology A

, Volume 170, Issue 3, pp 317–325 | Cite as

Configurational pattern discrimination responsible for dishabituation in common toads Bufo bufo (L.): Behavioral tests of the predictions of a neural model

  • DeLiang Wang
  • Jörg-Peter Ewert
Article
Accepted:

Summary

Recently, a neural model of visual pattern discrimination for stimulus-specific habituation was developed, based on previous behavioral studies which demonstrated that toads exhibit a dishabituation hierarchy for different worm-like stimuli. The model suggests that visual objects are represented by temporal coding and predicts that the dishabituation hierarchy changes when the stimulus/background contrast direction is reversed or the stimulus size is varied. The behavioral experiments reported in this paper were designed to test these predictions, (1) For a pair of stimuli from the contrast reversal prediction, the experimental results validated the theory. (2) For a pair of stimuli from the size reduction prediction, the experimental results failed to validate the theory. Further experiments concerning size effects suggest that configurai visual pattern discrimination in toads exhibits size invariance. (3) Inspired by the Groves-Thompson account of habituation, we found that dishabituation by a second stimulus has a separate process from habituation to a first stimulus. This paper serves as an example of a fruitful dialogue between experimentation and modeling, crucial for understanding brain functions.

Key words

Habituation Model testing Visual pattern recognition Non-associative learning Toad 

Abbreviations

a-h

worm-like stimulus patterns

AT

anterior thalamus

ERF

excitatory receptive field

IRF

inhibitory receptive field

RF

receptive field

R2 to R4

retinal ganglion cell types

vMP

posterior ventromedial pallium

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • DeLiang Wang
    • 1
  • Jörg-Peter Ewert
    • 2
  1. 1.Center for Neural EngineeringUniversity of Southern CaliforniaLos AngelesUSA
  2. 2.Abteilung NeurobiologieUniversität KasselKasselGermany

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