Effect of caudal midbrain lesions on conditioning of heart- and respiratory-rate responses in the pigeon.

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Abstract
Studied conditioning of heart and respiratory rates in 40 white Carneaux pigeons following lesions of caudal midbrain. Injury of the dorsolateral tegmentum at the level of oculomotor nucleus produced a severe deficit in conditioning of heart rate, but not respiratory rate. In contrast, lesions of the ventromedial tegmentum at the level of caudal interpeduncular nucleus significantly enhanced the magnitude of the heat-rate response, again without affecting respiratory conditioning. Extensive destruction of the central tegmentum did not affect either response. Findings are compared with those of a previous study of the effects of rostral midbrain lesions, and are discussed within the context of interruption of descending pathways affecting cardiovascular activity. (20 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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