AI Insight
This study investigated how learning to reach with mirror-reversed visual feedback affects subsequent motor learning tasks. Researchers found that participants who initially learned a mirror-reversal task showed savings (faster relearning) when encountering the same distortion again, driven primarily by conscious strategies rather than unconscious adaptation. However, prior mirror-reversal learning interfered with learning a different visuomotor rotation task, causing increased variability, longer reaction times, and reduced implicit learning contributions.
Why it matters
These findings advance understanding of how the brain stores and retrieves motor learning experiences, with potential applications for rehabilitation protocols and skill training. The results suggest that the type of initial motor learning can either facilitate or hinder subsequent learning depending on task similarity, which could inform how therapists sequence training exercises.
Understand the Science
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Learning to reach with a visuomotor distortion has been shown to influence subsequent reaches with the same distortion and with a new distortion. Here, we examined whether learning to reach with a small 20 degree mirror reversed distortion leads to faster re-learning of the same distortion (i.e., demonstrates savings) and whether learning to reach with a mirror reversed distortion influences subsequent reaches with a 20 degree visuomotor rotation distortion. Thirty participants first learned to reach with the mirror reversed distortion. Following washout trials with aligned cursor feedback, 15 participants reached again with the mirror reversed distortion (MR-MR group), while the 15 other participants reached with a visuomotor rotation distortion (MR-VMR group). An additional twenty participants only reached with the visuomotor rotation distortion (VMR-only group). Implicit (unconscious) and explicit (conscious strategy) contributions to learning were assessed using the process dissociation procedure. Evidence of savings was evident in the MR-MR group, such that participants demonstrated reduced hand angles when re-introduced to the mirror reversed distortion. This savings was driven by explicit processes, consistent with the rapid retrieval of previously acquired task solutions. Additionally, learning to reach with the mirror reversed distortion interfered with learning to reach with the visuomotor rotation distortion, such that the MR-VMR group demonstrated increased reach variability and longer reaction times when reaching with the visuomotor rotation distortion compared to the VMR-only group. Reduced implicit contributions were also evident in the MR-VMR group compared to the VMR-only group. Together, results indicate that learning to reach with a mirror reversed distortion promotes savings and influences learning to reach with a visuomotor rotation distortion through engagement of explicit processes.
Source: Savings and interference following learning to reach with mirror reversed feedback