Signatures of contextual interference in implicit sensorimotor adaptation.

Area of Science:

• Motor Learning
• Cognitive Psychology
• Neuroscience

Background:

• Contextual interference describes how practice schedules affect motor skill acquisition.
• Blocked practice leads to faster initial learning but poorer long-term retention.
• Its effect on implicit adaptation of overlearned skills is not well understood.

Purpose of the Study:

• To investigate if contextual interference applies to implicit motor skill recalibration.
• To compare blocked versus random practice in a visuomotor rotation task isolating implicit adaptation.

Main Methods:

• Two experiments using a visuomotor rotation task.
• Participants trained under blocked or random practice schedules.
• Implicit adaptation assessed via performance changes and retention tests.

Main Results:

• Random practice resulted in slower initial learning but significantly better retention compared to blocked practice.
• This effect persisted even when controlling for changes in practice context between training and assessment.

Conclusions:

• Contextual interference influences implicit adaptation of motor skills, not just acquisition of new skills.
• Random practice schedules are beneficial for the long-term retention of implicit motor adaptations.