Behavior-Correlated Properties of Tectal Neurons in Freely Moving Toads

  • Evelyn Schürg-Pfeiffer

Abstract

Searching for the cellular fundamentals of visuomotor function, in the optic tectum of paralyzed toads and frogs various neurons can be classified with respect to their sensitivity or selectivity in response to moving configurai visual stimuli. The tectal T5-type neurons were of particular interest, since these — as output elements of pretectal/tectal circuitry — are suggested to be involved in configurai pattern recognition and in releasing various action patterns (concept of “command releasing system”). The present data obtained from T5.2 neurons in freely moving toads during prey-catching behavior support this concept: (i) These neurons are best activated by prey objects, e.g., worm-like stimuli; (ii) their discharge peak-frequencies depend on the animal’s motivation and attention; (iii) discharges precede orienting and snapping toward prey; (iv) during orienting these neurons are typically active, but during snapping they are silent. The configuration-selective characteristics both of T52 neurons and prey-catching are abolished after lesioning caudal thalamic (pretectal) nuclei while the prey-catching system itself is functioning. Hence, T5.2 neurons display at least four behavior-correlated properties: recognition, pre-motor activity, motor-feedback, and state-dependent modulation.

Keywords

Superior Colliculus Optic Tectum Single Unit Activity Bufo Bufo Tectal Neuron 
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 Science+Business Media New York 1989

Authors and Affiliations

  • Evelyn Schürg-Pfeiffer
    • 1
  1. 1.Abteilung Neuroethologie, Fachbereich Biologie/ChemieUniversität KasselKasselFR Germany

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