Neural dysregulation during a working memory task in human immunodeficiency virus-seropositive and hepatitis C coinfected individuals.

Abstract:

:Cognitive and functional neural correlates of human immunodeficiency virus (HIV) are only partially understood at present. Variability in neural response, which has been noted in the literature, may relate to clinical factors associated with HIV, including time since HIV diagnosis, CD4 count and nadir, HIV viral load, and comorbid infectious processes, especially hepatitis C. The present investigation evaluated working memory-related functional neural activation in 26 HIV+ participants, 28 demographically matched HIV-seronegative individuals, and 8 HIV+ individuals with hepatitis C coinfection. Analyses examined impact of HIV infection duration, CD4 count and nadir, HIV viral load, and hepatitis C serostatus. Results showed that HIV-seronegative participants had fastest reaction times, and during the working memory task, HIV+ participants with hepatitis C coinfection showed strongest bias toward commission errors; however, signal detection (i.e., overall task performance) was equivalent across groups. Functional magnetic resonance imaging (fMRI) results showed HIV-related greater activation to an easier vigilance task and HIV-related lower activation to a more difficult working memory task, consistent with reduced cognitive reserve. Hepatitis C coinfection related to diffuse neural dysregulation. Correlational analyses suggested relationships of increasingly severe disease with poorer functioning in brain regions linked to error monitoring and attention regulation.

journal_name

J Neurovirol

journal_title

Journal of neurovirology

authors

Caldwell JZ,Gongvatana A,Navia BA,Sweet LH,Tashima K,Ding M,Cohen RA

doi

10.1007/s13365-014-0257-3

subject

Has Abstract

pub_date

2014-08-01 00:00:00

pages

398-411

issue

4

eissn

1355-0284

issn

1538-2443

journal_volume

20

pub_type

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