Neural substrates of practice structure that support future off-line learning.

Area of Science:

• Neuroscience
• Motor Learning
• Cognitive Psychology

Background:

• Motor skill acquisition benefits from specific practice schedules.
• Random practice is known to improve retention, while blocked practice can hinder it.
• Understanding the neural mechanisms underlying these effects is crucial for optimizing learning strategies.

Purpose of the Study:

• To identify the neural correlates of random practice schedules during motor skill learning.
• To compare brain activity between random and blocked practice schedules using functional magnetic resonance imaging (fMRI).
• To investigate the relationship between neural activity, practice schedule, and long-term skill retention.

Main Methods:

• Participants learned finger sequences using their non-dominant hand under random or blocked practice schedules.
• fMRI was employed to measure brain activity during sequence preparation and production.
• A go/no go task differentiated neural activity related to preparation versus production.

Main Results:

• Random practice recruited a wider network of premotor-parietal, sensorimotor, and subcortical regions compared to blocked practice.
• Preparation-related neural activity under random practice remained stable or increased over time, unlike blocked practice.
• Higher activity in the ipsilateral left motor cortex correlated with successful skill retention across both practice schedules.

Conclusions:

• Random practice schedules facilitate robust off-line motor skill learning and enduring memory formation.
• Enhanced engagement of motor preparation and production networks underlies the benefits of random practice.
• The organization of training trials significantly impacts the neural basis of motor memory consolidation.