Disruption within brain default mode network in postpartum women without depression

Area of Science:

• Neuroscience
• Cognitive Science
• Medical Imaging

Background:

• Cognitive dysfunction is observed in the postpartum period, often linked to neurophysiological changes.
• Previous research indicates alterations in brain function during the postpartum phase.

Purpose of the Study:

• To investigate functional connectivity (FC) within the default mode network (DMN) in postpartum women without depression.
• To explore the association between DMN intrinsic functional connectivity and cognitive dysfunction using resting-state fMRI.

Main Methods:

• Resting-state functional magnetic resonance imaging (fMRI) was used.
• 21 postpartum women and 21 age/education-matched nulliparous women were scanned.
• Functional connectivity (FC) was analyzed using the posterior cingulate cortex (PCC) as a seed region.

Main Results:

• Postpartum women exhibited significantly decreased FC between the PCC and the left medial prefrontal cortex (mPFC) compared to controls.
• This reduced FC between PCC and mPFC was positively correlated with poorer performance on the Clock-Drawing Test (CDT) in postpartum women.

Conclusions:

• Decreased resting-state FC within the DMN is associated with impaired cognitive function in postpartum women.
• These findings highlight the role of the DMN in postpartum cognitive changes and suggest potential neuropathological mechanisms.