Verbal working memory storage and processing deficits in HIV-1 asymptomatic and symptomatic individuals

Area of Science:

• Neuropsychology
• Cognitive Neuroscience
• Infectious Disease Research

Background:

• Verbal working memory (WM) relies on frontostriatal circuits and is potentially vulnerable in HIV-1 infection.
• Previous studies indicate WM impairments in HIV-1 patients, but Baddeley's WM model lacks extensive investigation in this population.

Purpose of the Study:

• To investigate verbal WM deficits in HIV-1 infected individuals using Baddeley's model and an individual differences approach.
• To differentiate cognitive impacts in asymptomatic versus symptomatic HIV-1 patients.

Main Methods:

• Employed cognitive neuropsychological methods to assess verbal WM in HIV-1 seronegative, asymptomatic, and symptomatic groups.
• Utilized phonological similarity, irrelevant speech, word-length, and articulatory suppression effects to evaluate the phonological loop.
• Assessed simultaneous storage and processing capacity using the Verbal Memory Span test.

Main Results:

• HIV-1 symptomatic individuals showed impaired phonological storage, unlike asymptomatic subjects.
• Both asymptomatic and symptomatic HIV-1 groups exhibited intact articulatory control but impaired simultaneous storage and processing on the Verbal Memory Span test.

Conclusions:

• Deficits in simultaneous short-term storage and processing are present in both early and later stages of HIV-1 infection.
• Findings highlight the impact of HIV-1 on specific components of verbal working memory.