The parasympathetic component of unlearned and acquired cardiac responses

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“The purpose of the present experiments was to study the role of the vagus nerves in the cardiac component of the OR and the CR. The inhibitory influence of the vagus nerves was nullified by large doses of atropine sulphate. It was found that atropine (a) increases the latency and decreases the magnitude of the cardiac response; (b) increases the frequency of the motor CR; and (c) impairs motor and cardiac differentiation. It was concluded that the HR acceleration of the intact animal to mild and moderate stimuli is dependent in large part upon a decrease in vagal inhibition. Thus, the parasympathetic nervous system plays an important role in cardiac acceleration.” (16 ref.) From Psyc Abstracts 36:01:1DJ63D. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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