[Finger Microtremor--an experimental study (author's transl)].
This paper deals with the recording of finger microtremor using a self-constructed apparatus (amplitudes 0.5 to 0.05 mm). 32 healthy subjects aged 7 to 60 years were examined by means of a test set permitting the exact recording of the amplitudes and frequencies of the right middle finger movement. Special attention was given to the vertical plane of the tremor in order to permit more exact demonstration. Frequencies of 5 to 12 cps. were recorded, the mean frequency being 7.55+/-1.12 cps. The minimum amplitude was 0.02 and the maximum recorded amplitude amounted to 1.4 mm, with a mean amplitude of 0.12+/- 0.07 mm. No significant differences in amplitude or frequency were noted with respect to age or sex. This method is useful in the accurate quantitative assessment of every kind of tremor.