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  • 1
    Digitale Medien
    Digitale Medien
    Tone Intensity and Rise-Decay Time Effects on Cardiac Responses During Sleep (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Psychophysiology 12 (1975), S. 0 
    Details
    ISSN: 1469-8986
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Psychologie
    Notizen: If the prolonged orienting response, reflected in monophasic cardiac deceleration, indicates attention to stimulus inputs, it should not be easy to evoke the response during sleep. Two experiments confirmed and extended previous work showing that the heart rate response in sleep is primarily accelerative. Acceleration occurred with low intensity. 1000 Hz tones of gradual onset and even to tone offsets when either tone onsets or offsets also elicited a K-Complex. In the absense of a K-complex, there were no significant or consistent changes. Since the accelerative component was present on the first trial, habituation could not account for its appearance. It was concluded that the sleep response probably does not reflect an orienting response.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1469-8986.1975.tb01287.x
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  • 2
    Digitale Medien
    Digitale Medien
    Amplitude and Habituation of the Orienting Reflex as a Function of Stimulus Intensity (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Psychophysiology 11 (1974), S. 0 
    Details
    ISSN: 1469-8986
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Psychologie
    Notizen: Two 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1469-8986.1974.tb01133.x
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