Abstract
1. 1. Biotelemetry transmitters were surgically implanted in the abdominal cavity of three eastern chipmunks, Tamias striatus, and the heart rate response to fear was investigated. 2. 2. Each chipmunk showed fear bradycardia. Mean heart rate values during prestimulus, stimulus and poststimulus were 259 ± 10, 184 ± 13, and 246 ± 18 (X̄ ± SE) beats/min respectively. 3. 3. Respiratory sinus arrhythmia (RSA) occurred throughout the experiments, but increased during stimulus. Percent RSA were 10.0, 33.9 and 12.0 respectively. 4. 4. Atropine treatment increased heart rate and abolished respiratory sinus arrhythmia and fear bradycardia. 5. 5. Frightened chipmunk retreating to a safe refugium respond with a marked fear bradycardia. Respiratory sinus arrhythmia increased during fright. Harassment within the refugium resulted in subsequent fear tachycardia.
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