Emergence of Frequency-Dependent Motor Variability Within Supra-Second Auditory Cueing

Area of Science:

• Neuroscience
• Motor Control
• Auditory Perception

Background:

• Motor variability (MV) is crucial for motor learning and adaptation in sensory-motor systems.
• Auditory-motor synchronization (AMS) involves synchronizing movements with auditory stimuli at specific inter-stimulus intervals (ISIs).
• Peri-second and supra-second ISIs are processed differently, with supra-second intervals demanding more cognitive resources and attention.

Purpose of the Study:

• To investigate the influence of tone frequency on predictive tapping and motor variability (MV) within peri-second and supra-second inter-stimulus intervals (ISIs).
• To understand how different auditory stimulus properties affect motor responses during synchronization tasks.

Main Methods:

• Thirty healthy participants were divided into peri-second and supra-second ISI conditions.
• Participants performed predictive tapping tasks synchronized to isochronous sound sequences.
• Analysis included negative and positive asynchrony for tapping and coefficient of variation (CV) of inter-tap intervals (ITIs) for MV.

Main Results:

• Predictive tapping occurred under short ISIs, independent of tone frequency.
• Motor variability (MV) was not affected by tone frequency under short ISIs.
• Under long ISIs, low-frequency tones resulted in significantly higher MV compared to high-frequency tones.

Conclusions:

• Motor variability (MV) operates predictively under short inter-stimulus intervals (ISIs) but reactively under long ISIs.
• Tone frequency significantly modulates MV in the supra-second range, with low frequencies increasing variability.
• Low-frequency tones are optimal for enhancing auditory-motor learning in the supra-second ISI range.