Condition | Findings in Alzheimer's disease | Findings in MCI |
---|---|---|
Functional connectivity of DMN during resting state | ↓ FC between HC and mPFC, PCC, precuneus and ventral ACC | ↓ FC between PCC and ACC, PCC and frontal cortex, mPFC and PCC, mPFC and ACC, mPFC and frontal cortex |
 | ↓ FC between PCC with mPFC, precuneus, and parietal Cortex | ↓ whole-brain FC to PCC and precuneus |
 |  | ↓ regional homogeneity in PCC and precuneus |
 | ↑ FC between left HC and right lPFC |  |
 |  | ↓ amplitude of low-frequency fluctuations in mPFC, PCC, precuneus and HC |
 | ↑ FC between parietal and occipital cortex |  |
 | ↓ Connectivity and activity in HC and PCC |  |
 | ↓ in coherence in the PCC and precuneus |  |
 | ↑ local homogeneity in cuneus and left fusiform gyrus |  |
Deactivation during cognitive task | ↓ deactivation in medial and lateral parietal regions during associative memory paradigm | ↓ deactivation in PCC, precuneus and anterior frontal lobe |
 |  | Depends on severity with increased deactivation in mild MCI |
 | ↓ deactivation in medial parietal and PCC during semantic classification |  |
 |  | Cognitive reserve affects deactivation indicating decompensation |
 | ↓ in mPFC, PCC, precuneus, parietal cortex and HC during nonspatial working memory and episodic visual memory encoding |  |