Task errors contribute to implicit aftereffects in sensorimotor adaptation

Area of Science:

• Neuroscience
• Motor Control
• Cognitive Science

Background:

• Sensory prediction errors arise from discrepancies between predicted and actual sensory feedback during movement.
• Task errors, defined as deviations from intended task outcomes, are hypothesized to drive strategic adaptation but their precise role is unclear.

Purpose of the Study:

• To investigate the role of task errors in sensorimotor adaptation to a visuomotor rotation.
• To determine if task errors contribute to implicit learning driven by sensory prediction errors.

Main Methods:

• Participants adapted to a 30° visuomotor rotation.
• Task errors were manipulated by either removing them (aligning target with feedback) or enforcing them (misaligning target and feedback) during reaching movements.

Main Results:

• Removing task errors significantly reduced adaptation during the perturbation exposure.
• Eliminating task errors also decreased post-adaptation aftereffects, even when participants knew the perturbation was removed.
• Enforcing task errors led to greater adaptation and aftereffects compared to control conditions.

Conclusions:

• Task errors are a critical component of implicit sensorimotor adaptation, contributing to learning from sensory prediction errors.
• The findings suggest that the neural systems processing sensory prediction errors are also sensitive to reward prediction errors associated with task success or failure.