Working memory load-dependent brain response predicts behavioral training gains in older adults

Area of Science:

• Neuroscience
• Cognitive Psychology

Background:

• Working memory (WM) shows a sigmoid relationship between load and brain activation in younger adults.
• Age-related changes in neural efficiency and capacity may alter this pattern.
• Older adults can improve WM performance through targeted training.

Purpose of the Study:

• Compare brain activation patterns (BOLD responses) between younger and older adults during an n-back task.
• Predict WM performance gains after training in older adults based on neural patterns.
• Investigate the role of neural efficiency and capacity in WM plasticity.

Main Methods:

• Functional magnetic resonance imaging (fMRI) during an n-back task at varying WM loads.
• Comparison of BOLD responses between younger and older participants.
• Prediction of training gains using baseline neural and demographic factors.

Main Results:

• More "youth-like" frontoparietal WM network activation patterns in older adults predicted better training outcomes.
• Neural efficiency and capacity predicted training gains independently of age, sex, education, and baseline performance.
• WM training led to decreased BOLD responses at lower task difficulties in older adults.

Conclusions:

• Neural efficiency and capacity predict WM system plasticity.
• WM training may enhance neural efficiency in older adults.
• Youth-like brain activation patterns are associated with greater WM plasticity and training success.