Sex-related differences in amygdala functional connectivity during resting conditions

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Neuroimaging

Background:

• Neuroimaging studies show sex differences in amygdala lateralization for emotional memory.
• These differences may stem from distinct functional connectivity patterns in the resting brain.

Purpose of the Study:

• To investigate if sex-related differences in amygdala involvement in emotional memory arise from differential functional connectivity at rest.
• To identify specific brain regions showing sex-related differences in amygdala functional connectivity.

Main Methods:

• Seed voxel partial least square analyses were used.
• Regional cerebral blood flow data were analyzed during resting conditions.

Main Results:

• Significant sex-related differences in amygdala functional connectivity were found at rest.
• The right amygdala showed greater connectivity in men (with sensorimotor cortex, striatum, pulvinar).
• The left amygdala showed greater connectivity in women (with subgenual cortex, hypothalamus).

Conclusions:

• Resting-state functional connectivity patterns of the amygdala differ between sexes.
• These sex-specific connectivity patterns may underlie differences in emotional memory processing.
• Observed differences may contribute to sex-related variations in medical and psychiatric disorders.