Kybernetik

, Volume 14, Issue 3, pp 167–183

Neurobiologie und System-Theorie eines visuellen Muster-Erkennungsmechanismus bei Kröten

  • J. -P. Ewert
  • W. v. Seelen
Article

DOI: 10.1007/BF00288919

Cite this article as:
Ewert, J.P. & Seelen, W.. Kybernetik (1973) 14: 167. doi:10.1007/BF00288919

Abstract

Quantitative behavioral experiments have shown that the toad uses mainly two types of gestalt information in prey/enemy discrimination: pattern extension in the direction of movement promotes, in general, the signal value prey, while extension perpendicular to the direction of movement promotes that of enemy. Registrations from single fibers and single cells at different stages on the visual path showed that the object extension perpendicular to the direction of movement is chiefly analysed by means of the retinal and thalamus pretectal nerve nets, whereas the extension in the direction of movement is analysed mostly by certain tectal nerve nets. Further neurobiological findings indicated that the prey/enemy discrimination is the result of subtractive interaction between the tectal and thalamus pretectal nerve nets. The system answers given by the retina, the retina-pretectum and the retinatectum to the input patterns used in the neurobiological experiments were determined for relevant space and time parameters on the basis of two dimensional neuron network models. The experimental results agree well with the theoretical ones. If the subtractive interaction between the model networks hypothesized from the neurophysiological results is applied, the resulting system answer describes the behavioral findings very well. So it is shown that the networks investigated would suffice in principle for the behavioral interpretations of the key stimulus prey/enemy — so far as these are known.

Copyright information

© Springer-Verlag 1974

Authors and Affiliations

  • J. -P. Ewert
    • 1
    • 2
  • W. v. Seelen
    • 1
    • 2
  1. 1.Arbeitsgruppe Neuro-Ethologie der GH KasselGermany
  2. 2.Institut für Allgemeine Zoologie und Biophysik der Universität MainzGermany

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