Experimental studies were made, with the following briefly stated results, on the discrimination of amplitude in case of whole body vibration.
1) Δ a mm, the discriminated amplitudes from several amplitudes, in case of increased series existed in the range from 0.24 to 0.63 mm and in case of decreased series existed in the range from 0.17 to 0.73 mm.
2) The higher the frequency of vibration, the smaller was the Δ a mm in case of transversal and longitudinal vibration.
3) Δ a/a in case of the smallest amplitude was greatest than in case of the other amplitude.
4) The discrimination in case of amplitude was weaker than in case of frequency.
