Brain, Behavior and Evolution

Original Paper

Responses of Single Neurons in the Toad’s Caudal Ventral Striatum to Moving Visual Stimuli and Test of Their Efferent Projection by Extracellular Antidromic Stimulation/Recording Techniques

Buxbaum-Conradi H. · Ewert J.-P.

Author affiliations

Abteilung Neurobiologie, Fachbereich Biologie/Chemie, Universität Kassel (GhK), Kassel, Germany

Keywords: ToadAmphibianAnuranAnamnioteVisionPrey-catchingStriatumOptic tectum

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Brain Behav Evol 1999;54:338–354
https://doi.org/10.1159/000006633

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: February 17, 2000
Issue release date: December 1999

Number of Print Pages: 17
Number of Figures: 8
Number of Tables: 2

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: https://www.karger.com/BBE

Abstract

Previous work in anuran amphibians has shown that activity in the caudal ventral striatum correlates with visuomotor activity: orienting responses toward prey fail to occur after striatal lesions. Thus it has been suggested that the striatum influences visually guided behavior. Therefore, the present study investigates visual response properties from neurons recorded in the striatum. Extracellular recordings of 104 single neurons of the cane toad’s (Bufo marinus) caudal ventral striatum (STR) reveal five different response properties: resting discharge activity uninfluenced by the visual test stimuli (group STR1, 24.0%); resting discharge activity increased by any moving visual object (STR2, 31.7%); preference to moving compact objects (STR3, 15.4%); preference to certain configurational moving objects (STR4a and b, 13.5%), and resting activity reduced by visual stimuli (STR5, 15.4%). The receptive fields of these neurons encompassed the contralateral (46%) or the entire field of vision (54%). Of the neurons recorded in the striatum, 34% responded to electrical stimuli applied in the rostral diencephalon to the ipsilateral lateral forebrain bundle (LFB) which connects the striatum with the optic tectum (e.g. either directly or via pretectum or tegmentum). Various electrically driven STR neurons (40%) have axons that project caudally through the LFB, which was suggested by their antidromic activation in response to electrical stimuli applied to the LFB in the rostral diencephalon. In the present study, the main striatal output is mediated by ‘motion detectors’ (STR2) and ‘compact object perceivers’ (STR3). It is suggested that the caudal ventral striatum is involved in visual attentional processes that allow the translation of perception into action.

© 2000 S. Karger AG, Basel



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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: February 17, 2000
Issue release date: December 1999

Number of Print Pages: 17
Number of Figures: 8
Number of Tables: 2

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: https://www.karger.com/BBE

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1999, Vol.54, No. 6

December 1999

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