Effect of roughness on vibration of human finger during a friction test

To study the effect of a rough texture on tactile perception, the human finger was equipped with a sensor very sensitive to the vibration generated during a touch test. The range of vibrational frequencies is well consistent with the frequency of Pacini. To analyze the vibrational characteristics of the human finger under different experimental conditions, our experimental results are based on two quantitative parameters: a parameter which measures the amplitude of the average vibration level Lv (dB), and a parameter related to the spatial resolution of the human finger and which is identified as the characteristic wavelength corresponding to the maximum of the power spectral density (PSD) in the Pacinian frequency band (1–500 Hz).