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- W1188479996 abstract "In response to a discrete auditory stimulus, rats exhibit a quick, lateral head jerk and a 40-50-bpm deceleration in heart rate (HR). Both the head jerk and the bradycardia are components of the orienting response (OR), which is presumed to reflect stimulus-directed attention. The present research examined the effects of cholinergic and dopaminergic blockade on the OR to an 80-dB tone. In Experiment 1, scopolamine hydrobromide was found to inhibit the HR OR in a dose-dependent manner ranging from little effect at 0.05 mg/kg to complete inhibition of the cardiac OR at 0.5 mg/kg. The head-jerk response, unlike the cardiac response, was undiminished by scopolamine. In the second experiment, haloperidol, administered at dosages ranging from 0 to 10 mg/kg, attenuated the behavioral response (head jerk) in a dose-dependent fashion but had no effect on the cardiac component of the OR. These results demonstrate that the autonomic and behavioral components of the OR are independent representations of a common central process unaffected by cardiosomatic coupling. The results also demonstrate that neither the cardiac nor the somatomotor component of the OR is dependent upon the integrity of central cholinergic or dopaminergic neurotransmission." @default.
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- W1188479996 date "1989-12-01" @default.
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- W1188479996 title "Pharmacological dissociation of heart rate and somatomotor components of the orienting response" @default.
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- W1188479996 doi "https://doi.org/10.3758/bf03337802" @default.
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