Crosstalk Between Auditory and Visual information in Motor Learning and Savings.

Sensorimotor adaptation relies on the integration of multisensory feedback, yet the specific contributions of auditory signals to this process remain poorly understood compared to vision. We tested 46 participants on a reaching task using visual, auditory, or combined feedback about terminal errors. Participants alternated between feedback modalities during learning and relearning, revealing how adaptation transfers across sensory systems. Strikingly, although auditory feedback alone failed to support initial learning, prior visual learning enabled subsequent auditory adaptation. Further experiments showed that this cross-modal transfer stems from a memory of the learned reaching direction, acting as an attractor for movement, independent of error-based mechanisms, or explicit strategies. Our findings unveil a novel pathway for sensory integration in motor learning, with implications for designing cross-modal training protocols.