Working memory impairment in children orphaned by parental HIV/AIDS: An event-related potentials study
Junfeng Zhao1, Lili Ji1, Shunshun Du1
1Institute of Behavior and Psychology, Department of Psychology, Henan University, Kaifeng, China.
Insights
Children orphaned by HIV/AIDS show impaired working memory. Electroencephalogram (EEG) findings reveal altered brain activity in AIDS orphans, suggesting deficits in attention and memory updating processes.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatrics
Background:
- Children orphaned by HIV/AIDS (AIDS orphans) face significant adversities including parental death, poverty, and stigma.
- Early life adversities are known to impact brain development, particularly executive functions like working memory.
- Limited research exists on the neural dynamics of working memory in AIDS orphans.
Purpose of the Study:
- To investigate the neural dynamics of working memory processing in AIDS orphans using electroencephalogram (EEG).
- To compare working memory-related brain activity between AIDS orphans and non-orphan controls.
Main Methods:
- Utilized electroencephalogram (EEG) technique with n-back tasks.
- Analyzed EEG data using time-frequency analysis.
- Included 81 AIDS orphans and 62 non-orphan controls.
Main Results:
- AIDS orphans exhibited smaller N2 and larger P2, P3 brain wave activations compared to controls.
- Enhanced theta band oscillations and attenuated alpha band oscillations were observed in AIDS orphans.
- These EEG patterns suggest impaired attention allocation, stimulus processing, and updating within working memory.
Conclusions:
- AIDS orphans demonstrate a deficit in working memory processing.
- Neural dynamic alterations in AIDS orphans are linked to impairments in attention and working memory updating.
- Findings highlight the long-lasting neurological effects of early life adversity in AIDS orphans.
Abstract:
A large body of literature has established that children orphaned by HIV/AIDS ('AIDS orphans') face numerous challenges, such as parental death, poverty, disrupted school attendance and stigma. All of these early life adversities can have long-lasting effects on brain function, especially the executive functions. Working memory, as one of the most studied aspects of executive functions, is also reported to be impaired in children with early adversity. However, limited data are available regarding how early life adverse events affect the neural dynamic associated with working memory processing in AIDS orphans. This study applied the electroencephalogram (EEG) technique to investigate the working memory process in 81 AIDS orphans and 62 non-orphan controls with n-back tasks. Results from EEG analysis and time-frequency analysis showed that AIDS orphans displayed smaller N2 and larger P2, P3 activation as well as enhanced theta and attenuated alpha band oscillations compared to the controls. The present findings indicated a deficit in working memory process in AIDS orphans and suggested that this deficit might be due to the impairments in attention allocation, detection and classification of stimuli and updating process in working memory.
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