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Updated: Apr 29, 2026
Microstate and Omega Complexity Analyses of the Resting-state Electroencephalography
Published on: June 15, 2018
Selective changes of resting-state brain oscillations in aMCI: an fMRI study using ALFF
Zhilian Zhao1, Jie Lu1, Xiuqin Jia1
1Department of Radiology, Xuanwu Hospital of Capital Medical University, Beijing 100053, China ; Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing 100053, China.
Abstract:
Mild cognitive impairment (MCI) refers to a transitional state between normal aging and dementia and is a syndrome with cognitive decline greater than expected for an individual's age and educational level. As a subtype of MCI, amnestic mild cognitive impairment (aMCI) most often leads to Alzheimer's disease. This study aims to elucidate the altered brain activation in patients with aMCI using resting-state functional magnetic resonance. We observed Frequency-dependent changes in the amplitude of low-frequency fluctuations in aMCI patients (n = 20), and normal subjects (n = 18). At the same time, we took gray matter volume as a covariate. We found that aMCI patients had decreased amplitude of low-frequency fluctuation signal in left superior temporal gyrus, right middle temporal gyrus, right inferior parietal lobe, and right postcentral gyrus compared to the control group. Specially, aMCI patients showed increased signal in left superior and middle frontal gyrus. Our results suggested that increased activation in frontal lobe of aMCI patients may indicate effective recruitment of compensatory brain resources. This finding and interpretation may lead to the better understanding of cognitive changes of aMCI.
Insights
Amnestic mild cognitive impairment (aMCI) patients show reduced brain activity in key areas but increased frontal lobe activation, suggesting compensatory mechanisms. This research aids understanding of aMCI
Area of Science:
- Neuroscience
- Cognitive Science
- Radiology
Background:
- Mild cognitive impairment (MCI) is a transitional stage between normal aging and dementia.
- Amnestic mild cognitive impairment (aMCI), a subtype of MCI, is a significant risk factor for Alzheimer's disease.
- Understanding brain alterations in aMCI is crucial for early diagnosis and intervention.
Purpose of the Study:
- To investigate altered brain activation patterns in aMCI patients using resting-state functional magnetic resonance imaging (rs-fMRI).
- To identify specific brain regions with abnormal low-frequency fluctuations in aMCI.
- To explore potential compensatory mechanisms in the aMCI brain.
Main Methods:
- Resting-state functional magnetic resonance imaging (rs-fMRI) was employed to assess brain activity.
- Amplitude of low-frequency fluctuations (ALFF) was analyzed in aMCI patients (n=20) and healthy controls (n=18).
- Gray matter volume was considered as a covariate in the analysis.
Main Results:
- aMCI patients exhibited decreased ALFF in the left superior temporal gyrus, right middle temporal gyrus, right inferior parietal lobe, and right postcentral gyrus compared to controls.
- Conversely, aMCI patients showed increased ALFF in the left superior and middle frontal gyrus.
- These findings indicate distinct patterns of hypo- and hyper-activation in specific brain regions associated with aMCI.
Conclusions:
- Altered brain activation, characterized by decreased signals in temporal and parietal regions and increased signals in the frontal lobe, is evident in aMCI.
- The heightened activation in the frontal lobe may represent the brain's attempt to compensate for cognitive deficits.
- These insights contribute to a better understanding of the neurobiological underpinnings of cognitive changes in aMCI and may inform future therapeutic strategies.
