Altered self-referential network in resting-state amnestic type mild cognitive impairment

Area of Science:

• Neuroscience
• Cognitive Science
• Medical Imaging

Background:

• Amnestic mild cognitive impairment (aMCI) is a precursor to Alzheimer's disease (AD).
• Self-referencing network (SRN) alterations are implicated in aMCI, but resting-state patterns remain unclear.
• The relationship between SRN and other resting-state networks in aMCI is not well understood.

Purpose of the Study:

• To investigate resting-state functional connectivity within the SRN in aMCI subjects.
• To explore the relationship between the SRN and other large-scale brain networks in aMCI.
• To understand how SRN patterns change over time in aMCI.

Main Methods:

• Longitudinal resting-state functional magnetic resonance imaging (fMRI) was used.
• 26 aMCI subjects and 18 healthy controls were scanned.
• Independent component analysis and cross-correlation were employed to analyze SRN connectivity.

Main Results:

• aMCI subjects showed increased functional connectivity within the SRN at baseline.
• This increased connectivity diminished longitudinally in aMCI subjects.
• aMCI subjects exhibited decreased connectivity between the SRN and the default mode network.

Conclusions:

• Resting-state SRN alterations are identifiable in aMCI.
• These findings provide insights into the neural underpinnings of aMCI.
• Understanding SRN changes may aid in tracking aMCI progression towards Alzheimer's disease.