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Auditory working memory in HIV-1 infection.
E M Martin1, T S Sullivan, R A Reed
1Department of Psychiatry, University of Illinois College of Medicine, Chicago 60612, USA. EMartin@psych.uic.edu
Summary
HIV infection impairs auditory working memory processing in male drug users. This deficit involves multiple working memory functions, suggesting prefrontal cortex abnormalities in HIV-1 infection.
Area of Science:
- Neuroscience
- Psychology
- Infectious Diseases
Background:
- Human Immunodeficiency Virus (HIV) infection is associated with cognitive impairments.
- Working memory deficits are frequently reported in individuals with HIV.
- Previous research has primarily focused on subcortical deficits in HIV-associated neurocognition.
Purpose of the Study:
- To evaluate auditory working memory processing in HIV-seropositive (HIV+) versus HIV-seronegative (HIV-) male drug users.
- To isolate the contribution of working memory processing, minimizing storage demands.
- To investigate the specific components of working memory affected by HIV.
Main Methods:
- Utilized a modified Letter-Number Span Task with an added control condition.
- Compared performance between 41 HIV+ and 37 HIV- male drug users.
- Derived an index of working memory processing from task performance.
Main Results:
- HIV+ subjects demonstrated significantly poorer performance on working memory processing compared to HIV- controls.
- The observed deficits were consistent across multiple informational domains.
- Findings suggest a multi-component nature of working memory impairment in HIV+ individuals.
Conclusions:
- HIV infection leads to significant deficits in auditory working memory processing.
- These deficits involve multiple functions within working memory.
- Functional abnormalities of the prefrontal cortex should be emphasized in models of HIV-1 neurocognitive effects.