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Altered brain activation patterns under different working memory loads in patients with type 2 diabetes
Yaojing Chen1, Zhen Liu1, Junying Zhang1
1State Key Laboratory of Cognitive Neuroscience and Learning and IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing, China BABRI Centre, Beijing Normal University, Beijing, China Center for Collaboration and Innovation in Brain and Learning Sciences, Beijing Normal University, Beijing, China.
Diabetes Care
|November 19, 2014
Summary
Type 2 diabetes mellitus impairs working memory and alters brain activation patterns, particularly in the frontal cortex. Reduced superior frontal gyrus activity correlates with poorer cognitive function in these patients.
Area of Science:
- Neuroscience
- Endocrinology
- Cognitive Science
Background:
- Type 2 diabetes mellitus (T2DM) is linked to cognitive decline and increased Alzheimer's disease (AD) risk.
- Working memory (WM) is a cognitive function notably affected in mild cognitive impairment and AD.
Purpose of the Study:
- To investigate the impact of T2DM on cognitive performance.
- To explore neuronal damage and brain activation patterns during working memory tasks in T2DM patients.
Main Methods:
- A visual n-back task was employed to assess working memory.
- Functional magnetic resonance imaging (fMRI) was used to examine brain activity.
- Cognitive performance was compared between T2DM patients and control subjects.
Main Results:
- T2DM patients demonstrated deficits in executive function and memory compared to controls.
- Altered brain activation patterns were observed in T2DM patients under varying WM loads.
- Reduced activation in the left inferior frontal gyrus (low load) and left middle/superior frontal gyri (high load) was noted.
- Diminished activation in the frontal cortex increased with task difficulty.
- Lower superior frontal gyrus (SFG) activation was associated with worse cognitive function.
Conclusions:
- T2DM is associated with impaired working memory and altered brain activity.
- The findings highlight the relationship between cognitive function, neuronal activity, and AD risk in T2DM.
- Further longitudinal studies are recommended to validate these findings and assess the clinical utility of brain imaging.
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