Studies of the sensation of vibration: 1. Variability of the vibratory threshold as a function of amplitude and frequency of mechanical vibration.

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Abstract
For a group of 20 S's the splithalf Pearson correlation coefficients for 10 threshold determinations (using a stimulator .5 cm. in diameter) of the right index finger tip at frequencies of 200, 400, 600, and 800 d.v., were .94, .99, .96, and .97. In making group studies of the thresholds 4 determinations are sufficient to obtain high reliability, since the correlation coefficients for 4 readings are .87, .97, .90, and .92. The correlation between the thresholds at 200 and 800 d.v. for the 20 S's was .72. Thresholds of 4 subjects were determined at intervals of from 3 to 7 days; 10 sessions, with 4 threshold determinations for each, were used. Both the right and left index finger tips were stimulated at frequencies of 200, 400, 800, and 1000 d.v. Results show large fluctuations on the different days. This means that it is necessary to study the vibratory threshold of an individual case over a number of days in order to get a good approximation of the actual threshold. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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