Amplitude and Habituation of the Orienting Reflex as a Function of Stimulus Intensity

Psychophysiology - Tập 11 Số 6 - Trang 647-659 - 1974
Jan C. Jackson1
1University of Wisconsin

Tóm tắt

ABSTRACTTwo within‐S experiments involving 20 Ss each and one between‐S experiment employing 100 Ss were performed to examine effects of stimulus intensity on orienting response amplitude and habituation. Five intensities of a 1000 Hz tone were presented, ranging from 0 to 40 dB in Experiment I and from 0 to 80 dB in Experiments II and III. Response measures were skin conductance response (SCR) and heart rate (HR). Skin conductance response amplitude increased monotonically with stimulus intensity while HR deceleration was a generally decreasing function which tended to decrease, increase, and finally decrease again as intensity increased.Not only was deceleration greatest at 0 dB but it was more resistant to habituation. Several intensities of test stimulation were presented after habituating stimuli in the between‐S experiment. Skin conductance response to test stimuli was facilitated by habituation at 0 dB and depressed by habituation at 80 dB. The results suggest a direct relationship between stimulus intensity and development of habituation.

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Psychophysiology

Tập 11 Số 6

647-659

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