Adaptive changes in automatic motor responses based on acquired visuomotor correspondence.

Area of Science:

• Neuroscience
• Motor Control
• Human-Computer Interaction

Background:

• Automatic motor responses are modulated by stimulus-response congruency, known as the congruency effect.
• The visuomotor system's ability to adapt its internal model of correspondence is crucial for flexible motor control.

Purpose of the Study:

• To investigate if adapting to new visuomotor correspondences alters automatic motor responses.
• To determine if the congruency effect changes based on acquired visuomotor adaptation.

Main Methods:

• Participants underwent visuomotor adaptation using a tracking task with rotated visual feedback (30° or 150°).
• The congruency effect was measured using a visual response task assessing finger movements (left/right).

Main Results:

• Visuomotor adaptation to a 150° rotation modulated the congruency effect, aligning with the new visuomotor correspondence.
• The effect did not completely reverse, and no change in automatic responses was observed when the internal model was reset.
• After-effects were observed, increasing with training but decreasing over time.

Conclusions:

• The findings suggest that automatic motor response modulation relies on the currently active internal model, highlighting the adaptive nature of the visuomotor system.
• The study discusses the mechanism of after-effects in visuomotor tasks, proposing it involves switching between internal models.