Abstract
ABSTRACTA sec‐by‐sec analysis was made of heart rate (HR) responses of children receiving an auditory stimulus pattern at either a moderate (70 db) or a loud (95 db) intensity. Only an initial deceleration to the first 70 db stimulus significantly departed from prestimulus level. The first 95 db pattern produced two components which statistically differed from prestimulus level: an initial deceleration and a sustained later deceleration. Differential habituation effects occurred at the two intensities with stimulus repetition. The only significant response to subsequent presentations of the 70 db tones was HR acceleration and this response showed complete habituation, whereas significant HR deceleration occurred with repetition of the 95 db tones. The results are consistent with the hypothesis that a nonfamiliar stimulus will produce an orienting reaction (OR) and HR deceleration. Furthermore, the differential stimulus repetition effects indicate that loud tones may disrupt the process of HR habituation seen to moderate intensity tones, and produce a decelerative response which is resistant to habituation.
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