Mapping of brain activity in mesencephalic and diencephalic structures of toads during presentation of visual key stimuli: a computer assisted analysis of (14C)2DG autoradiographs |
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| Authors: | T Finkenstädt N T Adler T O Allen S O E Ebbesson J -P Ewert |
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| Institution: | (1) Neuroethology and Biocybernetics Laboratories, University of Kassel, Postfach 101380, D-3500 Kassel, Germany;(2) Psychology Department, University of Pennsylvania, Philadelphia, USA;(3) Medical Center, Louisiana State University, Shreveport, USA |
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| Abstract: | Summary The (14C)2DG autoradiographic technique has been employed to quantitatively map glucose utilization in the mesencephalon, the diencephalon and the cerebellum, of toads in response to configurational moving visual stimuli: (i) a 0.4 cm × 2.8 cm worm-like stripe (W) which elicited prey catching responses, (ii) a 8.4 cm × 8.4 cm square (S) that released predator avoidance responses, and (iii) a 2.8 cm × 0.4 cm antiworm-like stripe (A) which elicited no motor activity.For various brain nuclei different relationships were obtained: The optic tectum showed statistical significant higher 2DG uptake during worm-stimulation (¯X
W) than during antiworm stimulation (¯X
A), i.e.¯X
W>¯X
A. The latter visual pattern led to a 2DG utilization that was statistically significant stronger than during stimulation with a square (¯X
S), i.e.¯X
A>¯X
S. Thus, in comparison between right and left hemisphere as well as between brains the following ratios were obtained:Optic tectum:¯X
W>¯X
A>¯X
S; nucleus isthmi:¯X
W>¯X
A-¯X
s; posterodorsal lateral thalamic nucleus:¯X
S>¯X
A>¯X
W; posteroventral lateral thalamic nucleus:¯X
S>¯X
A ¯X
W; posterior thalamic nucleus:¯X
W>¯X
A¯X
S; anteripr division of the lateral thalamic nucleus:¯X
W>¯X
A¯X
S; anterior thalamic nucleus:¯X
A>¯X
S>¯X
W; nucleus of Bellonci and dorsal division of the ventrolateral thalamic nucleus:¯X
W¯X
A¯X
S; cerebellum:¯X
S¯X
W>¯X
A.Abbreviations
A
anterior thalamic nucleus
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Cb
cerebellum
-
Hyp
hypothalamus
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Ist
nucleus isthmi
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cl. Ist
contralateral Ist
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La
lateral thalamic nucleus, anterior division
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Lpd
lateral thalamic nucleus, posterodorsal division
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Lpv
lateral thalamic nucleus, posteroventral division
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MP
medial pallium
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NB/VLd
nucleus of Bellonci and ventrolateral thalamic nucleus, dorsal division
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P
posterior thalamic nucleus
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PO
preoptic area
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Sna
snapping evoking area=ventrolateral tectum
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Str
striatum
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Tec
tectum opticum |
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| Keywords: | |
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