Tapping strength variability in sensorimotor experiments on rhythmic tapping

Area of Science:

• Neuroscience
• Human motor control
• Time series analysis

Background:

• Human motor control often exhibits fluctuations.
• Periodic tapping reveals underlying sensorimotor processes.
• 1/fβ-noise and long-range correlations characterize many biological systems.

Purpose of the Study:

• Investigate sensorimotor tapping strength fluctuations.
• Analyze periodic tapping with and without metronome synchronization.
• Characterize the statistical properties of tapping strength variations.

Main Methods:

• Psychophysical experiments were conducted.
• Time series analyses were employed.
• Power spectral density and autocorrelation functions were calculated.

Main Results:

• Tapping strength fluctuations followed an inverse power law (1/fβ-noise).
• Long-range correlations and scale-free behavior were observed.
• Rhythmic peaks and stroke accentuation occurred during metronome synchronization.

Conclusions:

• Human periodic tapping demonstrates inherent long-range correlations.
• Metronome synchronization introduces rhythmic modulations in tapping.
• These findings offer insights into the neural control of rhythmic movement.