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Updated: May 22, 2026
Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
A diffusion tensor imaging and neuropsychological study of prospective memory impairment in South African HIV
Jacqueline Hoare1, Hoare Jacqueline1, Jenny Westgarth-Taylor
1Department of Psychiatry and Mental Health, University of Cape Town, Anzio Road Observatory, 7925 Cape Town, South Africa. hoare.jax@googlemail.com
Abstract:
HIV-associated prospective memory (ProM) impairment has emerged, in earlier studies as a significant predictor of medication management and independence in activities of daily living. The relationship between ProM and white matter integrity in HIV has not previously been investigated. Participants, including 128 HIV-infected individuals and 32 healthy controls, were assessed using a comprehensive neuropsychological evaluation and both objective and subjective measures of ProM. Diffusion tensor imaging (DTI) was utilized to investigate the relationship of white matter integrity to ProM in a randomly selected subsample of 40 HIV positive subjects, using a whole brain voxel-based approach to define fractional anisotrophy (FA) and mean diffusion (MD). Total prospective memory was significantly poorer in the HIV positive group when compared with healthy controls (p = 0.023). Time-based ProM was poorer in the HIV group compared to healthy controls both without prompts (p = 0.001) and with prompts (p = 0.001). Poor Total ProM score correlated with performance on neuropsychological tests of executive functioning, information processing speed, learning, and working memory (p < 0.05). Those HIV positive participants with poor ProM had significantly decreased FA in the regions of superior corona radiata (p = 0.0035), the corpus collosum (p = 0.006) and the cingulum (p = 0.0033) when compared to those who were HIV positive with good ProM. This study reinforces the importance of ProM assessment in HIV.
Insights
HIV-associated prospective memory (ProM) impairment affects daily living. This study links poorer ProM in HIV patients to reduced white matter integrity, highlighting the need for memory assessments in HIV care.
Area of Science:
- Neuroscience
- Medical Imaging
- Psychology
Background:
- Prospective memory (ProM) impairment is a known issue in HIV, impacting daily functioning.
- The connection between ProM deficits and white matter integrity in HIV has not been previously explored.
Purpose of the Study:
- To investigate the relationship between prospective memory and white matter integrity in individuals with HIV.
- To compare ProM performance and white matter integrity between HIV-infected individuals and healthy controls.
Main Methods:
- Neuropsychological evaluation and objective/subjective ProM measures were used for 128 HIV+ individuals and 32 controls.
- Diffusion tensor imaging (DTI) assessed white matter integrity (fractional anisotropy and mean diffusion) in a subsample of 40 HIV+ participants.
- Whole-brain voxel-based analysis examined correlations between ProM and white matter measures.
Main Results:
- HIV-infected individuals showed significantly poorer overall and time-based ProM compared to healthy controls.
- Poor ProM scores correlated with deficits in executive functioning, processing speed, learning, and working memory.
- HIV+ individuals with poor ProM exhibited decreased fractional anisotropy in the superior corona radiata, corpus callosum, and cingulum.
Conclusions:
- This study establishes a link between prospective memory impairment and reduced white matter integrity in HIV.
- Findings underscore the clinical significance of assessing prospective memory in the management of HIV.
- White matter changes may underlie the prospective memory deficits observed in HIV-associated neurocognitive disorders.
