Verbal learning in logopenic variant Primary Progressive Aphasia: An EEG investigation

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neurology

Background:

• Logopenic variant of primary progressive aphasia (lvPPA) is characterized by impaired word retrieval and repetition, suggesting phonological working memory deficits.
• Phonological working memory is crucial for verbal learning, yet research on verbal learning in lvPPA is limited.
• Understanding electrophysiological correlates of verbal learning in lvPPA is essential for developing targeted interventions.

Purpose of the Study:

• To investigate the relationship between resting-state electroencephalographic (EEG) activity and verbal learning abilities in individuals with lvPPA.
• To identify specific EEG frequency bands and brain regions associated with verbal learning deficits in lvPPA.
• To provide preliminary data for future neuromodulation studies aimed at improving verbal learning in lvPPA.

Main Methods:

• Collected short, low-density (8-channel) resting-state EEG recordings from nine individuals with lvPPA.
• Analyzed activity across five frequency bands (delta, theta, alpha, beta, gamma).
• Correlated EEG band power with performance on the Rey Auditory Verbal Learning Test (RAVLT).

Main Results:

• A statistically significant association was found between delta band activity and verbal learning across the brain in lvPPA.
• Higher delta power, particularly in the left parietal region, correlated with lower RAVLT scores.
• No significant associations were observed between other EEG frequency bands and verbal learning in this cohort.

Conclusions:

• This study offers the first insights into the link between resting-state EEG activity and verbal learning in lvPPA.
• Elevated delta band activity may serve as a potential electrophysiological marker for impaired verbal learning in lvPPA.
• Findings can inform the design of future neuromodulation strategies targeting specific frequency bands to enhance verbal learning in lvPPA and similar conditions.