Tapping is a psychomotor test to assess the psychophysiological brain functions, in particular, the perception of time.(1) Tapping without any external influence, with the patients’ preferred speed, is a “biological constant,” which reflects the rate of neural processes and endogenous rhythmic processes in the central nervous system.(2) However, during motor reproduction of rhythmic exogenous intervals, the stimulation frequency is important. A number of authors have shown the correlation between the frequency of exogenous stimulation in tapping and the body’s reaction. Thus, during stimulation of more than 1Hz, the leading parameter is the time response, while at the stimulation frequency of less than 1Hz it is the stimulus reaction that prevails. Consequently, at 1Hz frequency of exogenous stimulation, both reactions have an equivalent value.
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