The Effect of Cue Frequency, Modality and Rhythmicity on Finger Tapping Behaviour and Movement-Related Cortical...

Area of Science:

• Neuroscience
• Motor Control
• Human Movement

Background:

• Sensorimotor synchronization (SMS) links movement with sensory cues.
• Understanding how cue characteristics affect non-motor cortical activity during SMS is limited.

Purpose of the Study:

• To explore how cue frequency, modality, and rhythmicity influence behavior and cortical activity during SMS.
• To investigate EEG activity in motor and non-motor areas during finger tapping synchronized to cues.

Main Methods:

• Seventeen healthy participants performed finger tapping synchronized to visual and auditory cues.
• Cues varied in frequency (1 Hz, 3.2 Hz), modality (visual, auditory), and rhythmicity (isorhythmic, polyrhythmic).
• Movement-related cortical activity was measured using EEG, focusing on beta power.

Main Results:

• Higher cue frequency reduced tap accuracy, particularly with visual cues.
• Auditory cues improved tap accuracy and increased beta suppression in the premotor cortex compared to visual cues.
• Isorhythmic cues enhanced frontoparietal beta power, while polyrhythmic cues led to widespread beta suppression.

Conclusions:

• Cue characteristics significantly shape motor behavior and neural processing during SMS.
• Distinct movement control strategies are employed for discrete (slow cues) versus continuous (fast cues) movements.
• Auditory cues provide superior sensory guidance, especially at higher frequencies, and rhythmicity influences top-down versus bottom-up control.