Resting state signatures of domain and demand-specific working memory performance

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• Working memory (WM) and short-term memory (STM) are crucial for higher-level cognition.
• Understanding the neural basis of individual differences in memory capacity is an active area of research.
• Resting-state brain activity may reflect intrinsic cognitive capabilities.

Purpose of the Study:

• To investigate the relationship between resting-state brain activity patterns and off-line working and short-term memory performance.
• To determine if fractional amplitude of low-frequency fluctuations (fALFF) and seed-based connectivity during rest correlate with memory capabilities.
• To explore dissociable patterns of brain activity associated with verbal versus visual memory.

Main Methods:

• Participants underwent resting-state functional magnetic resonance imaging (fMRI).
• fMRI data were analyzed using fractional amplitude of low-frequency fluctuations (fALFF) and seed-based connectivity.
• Participants completed off-line verbal and visual working and short-term memory tests.

Main Results:

• fALFF in a fronto-parietal network positively correlated with a combined memory measure.
• STM performance correlated with fALFF in the right angular gyrus and left middle occipital gyrus.
• WM performance correlated with fALFF in the right intraparietal sulcus (IPS) and left cerebellar cortex.
• Verbal and visuospatial memory showed dissociable patterns of low-frequency fluctuations.
• Seed-based connectivity revealed hemispheric differences for verbal (left) and visual (right) WM.

Conclusions:

• Spontaneous low-frequency fluctuations during rest are linked to individual differences in working and short-term memory performance.
• Specific brain regions and networks are differentially associated with verbal and visual memory capacities.
• Resting-state fMRI provides insights into the neural underpinnings of cognitive abilities.