Abnormal Neural Network of Primary Insomnia: Evidence from Spatial Working Memory Task fMRI

Area of Science:

• Neuroscience
• Cognitive Psychology
• Sleep Medicine

Background:

• Primary insomnia (PI) is a sleep disorder with implications for cognitive function.
• Functional MRI (fMRI) is a key tool for investigating neural mechanisms in PI.
• Spatial working memory is a cognitive domain significantly affected in PI.

Purpose of the Study:

• To investigate neural network differences in spatial working memory between individuals with PI and healthy controls.
• To identify specific brain regions and connectivity patterns associated with PI during a spatial memory task.

Main Methods:

• Recruited 30 participants with PI and 30 age/gender-matched healthy controls.
• Assessed sleep quality (PSQI), depression, and spatial working memory.
• Utilized fMRI during a spatial memory task to analyze neural activation.

Main Results:

• Significant differences in PSQI scores and spatial working memory performance were found between groups (p < 0.01).
• PI patients showed altered neural network activation in the left temporal, left occipital, and right frontal lobes during the task.
• Reduced activation was observed in key areas including the parahippocampal gyrus, temporal cortex, frontal cortex, and superior parietal lobule in the PI group.

Conclusions:

• Individuals with PI exhibit characteristic abnormalities in neural network connectivity related to spatial working memory.
• These findings suggest a potential pathological mechanism underlying spatial working memory deterioration in PI.
• The observed neural abnormalities in PI may share similarities with mechanisms seen in other mental health disorders.