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
- Cite this article as:
- Finkenstädt, T., Adler, N.T., Allen, T.O. et al. J. Comp. Physiol. (1985) 156: 433. doi:10.1007/BF00613968
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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 (¯XW) than during antiworm stimulation (¯XA), i.e.¯XW>¯XA. The latter visual pattern led to a 2DG utilization that was statistically significant stronger than during stimulation with a square (¯XS), i.e.¯XA>¯XS. Thus, in comparison between right and left hemisphere as well as between brains the following ratios were obtained:
Optic tectum:¯XW>¯XA>¯XS; nucleus isthmi:¯XW>¯XA-¯Xs; posterodorsal lateral thalamic nucleus:¯XS>¯XA>¯XW; posteroventral lateral thalamic nucleus:¯XS>¯XA≃¯XW; posterior thalamic nucleus:¯XW>¯XA≃¯XS; anteripr division of the lateral thalamic nucleus:¯XW>¯XA≃¯XS; anterior thalamic nucleus:¯XA>¯XS>¯XW; nucleus of Bellonci and dorsal division of the ventrolateral thalamic nucleus:¯XW≃¯XA≃¯XS; cerebellum:¯XS≃¯XW>¯XA.
anterior thalamic nucleus
- cl. Ist
lateral thalamic nucleus, anterior division
lateral thalamic nucleus, posterodorsal division
lateral thalamic nucleus, posteroventral division
nucleus of Bellonci and ventrolateral thalamic nucleus, dorsal division
posterior thalamic nucleus
snapping evoking area=ventrolateral tectum