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The Influence of Amplitude and Frequency of Vestibular Stimulation on the Activity of Two-Month-Old Infants

David R. Pederson and Dick Ter Vrugt
Child Development
Vol. 44, No. 1 (Mar., 1973), pp. 122-128
Published by: Wiley on behalf of the Society for Research in Child Development
DOI: 10.2307/1127688
Stable URL: http://www.jstor.org/stable/1127688
Page Count: 7
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The Influence of Amplitude and Frequency of Vestibular Stimulation on the Activity of Two-Month-Old Infants
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Abstract

2-month-old infants were Ss in 3 experiments investigating the effective parameters of vertical vestibular stimulation. A 6-point observer rating scale was used as the measure of activity. In Experiment I, infants were rocked at a 0-, 2-, or 5-inch amplitude at 60 cycles per minute; effectiveness of rocking was a positive function of amplitude. In Experiment II the factorial combination of frequency (30 and 60 cycles per minute) with amplitude (3, 4, and 5 inches) was used. With the exception of 1 deviant group, the higher frequency of rocking was more effective than the lower frequency, and within each frequency condition there was a tendency for higher amplitudes to be more effective than lower amplitudes. Experiment III demonstrated that using a 4-inch amplitude the effectiveness of rocking was a positive function of frequency (0, 30, 50, and 70 cycles per minute). The results of these studies indicate that the effectiveness of rocking is determined by maximum acceleration.

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