The time course of changes during motor sequence learning: a whole-brain fMRI study

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Motor Control

Background:

• Conflicting results exist regarding brain activation changes during motor sequence learning.
• Some studies report decreased activation with learning, while others show increased activation.

Purpose of the Study:

• To investigate brain activity changes throughout the motor learning process using functional Magnetic Resonance Imaging (fMRI).
• To reconcile discrepancies in previous neuroimaging findings on motor sequence learning.

Main Methods:

• fMRI (blood oxygen-level-dependent signal) was used to measure brain activity over 40 minutes.
• Subjects learned an eight-move sequence via trial and error with visual pacing and feedback.
• Advanced statistical modeling accounted for linear and nonlinear signal changes over time, removing non-learning-related fluctuations.

Main Results:

• Linear and nonlinear changes in blood oxygen-level-dependent (BOLD) signal were observed in prefrontal, premotor, parietal cortex, neostriatal, and cerebellar areas.
• The study demonstrated both increasing and decreasing BOLD signal patterns over the course of learning.
• These population-level findings align with single-unit recordings in primates showing initial increases followed by decreases in neural activity during motor learning.

Conclusions:

• The study successfully reconciled conflicting findings in motor learning literature by demonstrating both increases and decreases in brain activation.
• fMRI can capture the dynamic BOLD signal changes reflecting different phases of motor sequence learning.
• The observed patterns support a model where neural activity initially increases and then decreases as motor sequences become learned.