Implicit and Explicit Learning of a Sequential Postural Weight-Shifting Task in Young and Older Adults

Area of Science:

• Motor control and learning
• Gerontology
• Cognitive neuroscience

Background:

• Postural motor learning is crucial for maintaining balance and executing daily tasks.
• Aging can affect motor control and the ability to learn new motor sequences.
• Understanding how different learning conditions impact motor control in older adults is important for developing effective interventions.

Purpose of the Study:

• To investigate sequence-specific postural motor learning in older and young adults.
• To compare the effectiveness of implicit versus explicit learning conditions on motor control.
• To determine age-related differences in adapting to sequence-specific motor tasks.

Main Methods:

• Participants performed a target-directed weight-shifting task using force plates.
• Three learning conditions were employed: implicit sequence learning with a cognitive task, explicit sequence learning with and without a cognitive task.
• Center of pressure (CoP) displacement and movement trajectories were analyzed to assess motor control and learning.

Main Results:

• Implicit learning improved plan-based motor control by anticipating sequence order in both age groups.
• Young adults effectively used explicit knowledge to reduce directional errors in single-task conditions.
• Both implicit and explicit learning improved movement stabilization over practice for all participants.

Conclusions:

• Implicit motor learning, which minimizes explicit awareness, may be a beneficial strategy for enhancing plan-based motor control in older adults.
• Explicit learning strategies may be less effective for older adults, particularly when cognitive load is high.
• These findings suggest tailored motor learning approaches could improve balance and mobility in aging populations.