J. Ewert

Publications113
h-index27
Citations2,791
Highly Influential Citations50
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Tectal Mechanisms That Underlie Prey-Catching and Avoidance Behaviors in Toads
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Neuroethology of releasing mechanisms: Prey-catching in toads
“Sign stimuli” elicit specific patterns of behavior when an organism's motivation is appropriate. In the toad, visually released prey-catching involves orienting toward the prey, approaching,… Expand
  • 295
  • 7
Neuroethology. An Introduction to the Neurophysiological Fundamentals of Behavior: By Jörg-Peter Ewert. Berlin, Heidelberg, New York: Springer-Verlag (1980). Pp. 342, Price $27.00
  • J. Ewert
  • Psychology
  • Animal Behaviour
  • 20 August 1980
1 What is Neuroethology?.- 1.1 Principal Scope.- 1.2 History.- 1.3 Problems.- 2 How Does a Stimulus Elicit Muscle Contraction?.- 2.1 Neural Building Blocks.- 2.2 A Behavioral Experiment.- 2.3 The… Expand
  • 81
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Intracellular activity of morphologically identified neurons of the grass frog's optic tectum in response to moving configurational visual stimuli
SummaryIn the grass frogRana temporaria, various classes of tectal neurons were identified by means of intracellular recording and iontophoretic staining using potassium-citrate/Co3+-lysine-filled… Expand
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Configurational prey-selection by individual experience in the toadBufo bufo
SummaryThe habituation method was used to investigate the toad's ability to discriminate between two dimensional prey dummies of different shapes and patterns: If immediately following habituation of… Expand
  • 35
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Thalamus, Praetectum, Tectum: Retinale Topographie und physiologische Interaktionen bei der KröteBufo bufo (L.)
Summary1.The retina is represented in the central layers of the optic tectum (stratum griseum et album centrale). The topography (Fig. 1) corresponds to the projection diagram of the optic fiber… Expand
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Projections to the midbrain tectum in Salamandra salamandra L.
SummaryFollowing unilateral iontophoretic application of HRP into the optic tectum of Salamandra salamandra, retrogradely HRP-filled cells were found bilaterally in the pretectum, tegmentum isthmi,… Expand
  • 31
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Elektrische Reizung des retinalen Projektionsfeldes im Mittelhirn der Erdkröte (Bufo bufo L.)
  • J. Ewert
  • Biology
  • Pflüger's Archiv für die gesamte Physiologie des…
  • 1 March 1967
SummaryWhen toads (Bufo bufo L.) are about to catch food, their first action is turning towards prey (taxis). After elimination of all moving visual patterns, electrical stimulation of small parts in… Expand
  • 30
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Apomorphine Alters Prey-Catching Patterns in the Common Toad: Behavioral Experiments and 14C-2-Deoxyglucose Brain Mapping Studies
Previous studies on the dopaminergic modulation of visuomotor functions in amphibians showed that the dopamine agonist apomorphine (APO) alters prey-catching strategies. After systemic administration… Expand
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The Release of Visual Behavior in Toads: Stages of Parallel/Hierarchical Information Processing
TLDR
The release of toad’s prey-catching behavior (orienting, approaching, fixating and snapping) is mediated by releasing schemas, also called releasing mechanisms. Expand
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