Changes in tremor as a function of type of augmented visual information

Area of Science:

• Neuroscience
• Human Motor Control
• Biomechanics

Background:

• Postural finger tremor is commonly studied with natural vision.
• The influence of augmented visual feedback on tremor dynamics and inter-limb coordination remains less understood.

Purpose of the Study:

• To investigate how different types of augmented visual feedback affect postural finger tremor.
• To examine the impact on inter-limb tremor coordination.

Main Methods:

• Participants performed postural finger tasks under four visual conditions: no vision, natural vision, augmented vision (instantaneous acceleration), and augmented vision (instantaneous and past acceleration).
• A 3D accelerometer measured finger acceleration.
• Tremor variability, predictability, and inter-limb coupling were analyzed.

Main Results:

• Tremor variability did not significantly change across visual conditions.
• Removing vision increased tremor predictability in single-hand tasks.
• Augmented visual information increased tremor irregularity in two-hand tasks.
• No vision led to stronger inter-limb coupling compared to other conditions.

Conclusions:

• Augmented visual feedback alters finger tremor dynamics, increasing irregularity in bimanual tasks.
• Visual feedback significantly influences inter-limb tremor coordination, with reduced vision enhancing coupling.