Age-related visual dynamics in HIV-infected adults with cognitive impairment.
Neurol Neuroimmunol Neuroinflamm
; 7(3)2020 05.
Article
in En
| MEDLINE
| ID: mdl-32102916
ABSTRACT
OBJECTIVE:
To investigate whether aging differentially affects neural activity serving visuospatial processing in a large functional neuroimaging study of HIV-infected participants and to determine whether such aging effects are attributable to differences in the duration of HIV infection.METHODS:
A total of 170 participants, including 93 uninfected controls and 77 HIV-infected participants, underwent neuropsychological assessment followed by neuroimaging with magnetoencephalography (MEG). Time-frequency analysis of the MEG data followed by advanced image reconstruction of neural oscillatory activity and whole-brain statistical analyses were used to examine interactions between age, HIV infection, and cognitive status. Post hoc testing for a mediation effect of HIV infection duration on the relationship between age and neural activity was performed using a quasi-Bayesian approximation for significance testing.RESULTS:
Cognitively impaired HIV-infected participants were distinguished from unimpaired HIV-infected and control participants by their unique association between age and gamma oscillations in the parieto-occipital cortex. This relationship between age and gamma was fully mediated by the duration of HIV infection in cognitively impaired participants. Impaired HIV-infected participants were also distinguished by their atypical relationship between alpha oscillations and age in the superior parietal cortex.CONCLUSIONS:
Impaired HIV-infected participants exhibited markedly different relationships between age and neural responses in the parieto-occipital cortices relative to their peers. This suggests a differential effect of chronological aging on the neural bases of visuospatial processing in a cognitively impaired subset of HIV-infected adults. Some of these relationships were fully accounted for by differences in HIV infection duration, whereas others were more readily associated with aging.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Parietal Lobe
/
Aging
/
HIV Infections
/
Cognitive Dysfunction
/
Gamma Rhythm
/
Occipital Lobe
Type of study:
Etiology_studies
Limits:
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Language:
En
Journal:
Neurol Neuroimmunol Neuroinflamm
Year:
2020
Document type:
Article