Same task, different strategies: how brain networks can be influenced by memory strategy

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Neuropsychology

Background:

• Functional neuroimaging studies show distinct neural networks for cognitive tasks like working memory (WM).
• However, the specific memory strategies employed within a given WM task type (e.g., spatial) can influence brain activity.
• Individual differences in strategy use may explain variability in neuroimaging findings.

Purpose of the Study:

• To investigate if different memory strategies are used during a spatial working memory task.
• To characterize the neural networks associated with distinct memory strategies using functional magnetoencephalography (MEG) and diffusion tensor imaging (DTI).
• To examine the impact of strategy type on task performance and its correlation with white matter integrity.

Main Methods:

• Developed a questionnaire to identify individual memory strategies in 28 young adults during a spatial WM task.
• Utilized cluster analysis to group participants by strategy.
• Acquired MEG and DTI data to analyze brain activity and white matter structure.

Main Results:

• Identified two primary strategies: visuospatial and verbal.
• Observed significant differences in brain activation regions and timing between strategy groups.
• Verbal strategies were associated with better task performance.
• Visuospatial strategy performance correlated with white matter fractional anisotropy in specific tracts.

Conclusions:

• Memory strategy choice significantly alters brain activation patterns and timing during spatial working memory.
• Verbal strategies may offer a performance advantage in spatial WM tasks.
• Individual strategy differences represent a potential confounding factor in group-averaged neuroimaging studies and warrant further investigation.