Sex-dependent differences in connectivity patterns are related to episodic memory recall

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Neuroimaging

Background:

• Females generally outperform males on episodic memory tasks.
• Sex differences in brain structure and function are increasingly recognized.
• Understanding the neural basis of these cognitive sex differences is crucial.

Purpose of the Study:

• To investigate sex differences in brain connectome characteristics.
• To examine the association between brain connectivity and memory performance.
• To determine if connectome differences mediate sex-based variations in episodic memory.

Main Methods:

• Utilized diffusion-weighted imaging (DWI) and probabilistic tractography in 655 healthy young adults.
• Derived brain network metrics including graph strength, shortest path length, global efficiency, and weighted transitivity.
• Employed linear models and mediation analyses to assess group differences and relationships.

Main Results:

• Significant sex differences were found in weighted transitivity, with males showing higher values.
• A negative association was observed between weighted transitivity and memory performance.
• Connectome characteristics partially mediated sex-dependent differences in episodic memory.

Conclusions:

• Females demonstrate higher overall brain interconnectedness compared to males.
• Differences in brain connectivity partially explain why females often outperform males on memory tasks.
• These findings emphasize the significance of sex-specific brain networks in cognitive abilities.