Sensory prediction errors, not performance errors, update memories in visuomotor adaptation.

Area of Science:

• Neuroscience
• Motor Control
• Human Movement Science

Background:

• Motor adaptation relies on updating memories, with sensory prediction errors implicated in this process.
• The specific contribution of performance errors to motor memory updates remains unclear.

Purpose of the Study:

• To investigate whether performance errors, distinct from sensory prediction errors, contribute to motor memory updates in visuomotor adaptation.
• To dissociate the roles of sensory prediction errors and performance errors in motor learning.

Main Methods:

• Participants performed fast shooting movements under visuomotor rotation, with manipulated visual feedback to isolate sensory prediction errors and performance errors.
• Four experimental conditions varied the presentation of targets to strategically correct for performance errors.
• A delayed washout block assessed memory decay across conditions.

Main Results:

• All participants adapted to the visuomotor rotation, experiencing a drift away from the main target.
• While participants attempted to minimize performance errors, memory decay during the washout phase was similar across all conditions.
• Differences in performance during adaptation did not affect the stability of the updated motor memory.

Conclusions:

• Sensory prediction errors, not performance errors, are the primary drivers for updating the stable component of motor memory in visuomotor adaptation.
• This research distinguishes the roles of different error signals in motor learning and memory consolidation.