Hypertension Impacts the Oscillatory Dynamics Serving the Encoding Phase of Verbal Working Memory

Area of Science:

• Neuroscience
• Cognitive Science
• Cardiovascular Health

Background:

• Chronic hypertension is a significant factor in cognitive decline, particularly affecting executive function and working memory.
• Neural mechanisms underlying hypertension-related cognitive dysfunction remain largely unexplored.

Purpose of the Study:

• To investigate the neural processes of working memory in individuals with controlled hypertension, uncontrolled hypertension, and healthy controls.
• To identify differences in neural oscillations during memory encoding and maintenance across these groups.

Main Methods:

• A cross-sectional study involving magnetoencephalography (MEG) during a verbal working memory task.
• Comparison of neural oscillatory activity (alpha-beta) in the encoding and maintenance phases among three participant groups.

Main Results:

• Hypertension groups showed reduced alpha-beta oscillatory responses in left parietal regions during memory encoding compared to controls.
• Differences in right prefrontal oscillatory activity were observed between controlled and uncontrolled hypertension groups during encoding.
• These neural encoding responses correlated significantly with behavioral working memory performance.

Conclusions:

• Hypertension is linked to neurophysiological abnormalities during working memory encoding, while maintenance appears unaffected.
• Right hemispheric activity may represent compensatory mechanisms in controlled hypertension, potentially preserving cognitive function.
• Uncontrolled hypertension might involve diminished neural resources, limiting compensatory processing.