the targeted neurocognitive training (tnt) study

Conditions: HIV; Aging; Cognitive Function Abnormal; Cognitive Training; Older Adults

Summary: people with hiv (pwh) often suffer from cognitive impairments known as hiv-associated neurocognitive disorder (hand). cognitive impairments in pwh are not fully captured by traditional neurocognitive assessment; thus, we must examine cognitive performance both within a task (inconsistency) and across cognitive domains (dispersion), called intra-individual variability (iiv). iiv predicts cognitive impairment/decline, altered brain morphology, and neuropathology in many clinical populations. conceptually, iiv results from "executive dyscontrol" or the efficiency (or inefficiency) with which executive control processes coordinate other cognitive processes/domains. based on the executive dyscontrol hypothesis and underlying calculations of iiv, one way to improve cognition in pwh is through interventions that target improvements in their most severely impaired cognitive domains. we hypothesize such improvements, in turn, should reduce the strain placed on executive functioning resources, freeing up resources needed to compensate for impairments in any domain and, in turn, reducing iiv. computerized cognitive training, widely used in the study team's prior work, is ideally suited to target impairments in select cognitive domains using computerized cognitive training. in our systematic review of 13 cognitive training studies in pwh, we found cognitive training improved performance in the targeted domain. in this feasibility study, we will assess 150 pwh at baseline with the expectation to recruit 120 pwh with hand. then we will use a two-group pre-post experimental design of 120 adults with hand including: 1) a targeted neurocognitive training (tnt) group (n=60) to train each participant's two most impaired cognitive domains (e.g., attention \& memory) assessed from a neurocognitive battery at baseline, and 2) a no-contact control group (n=60). aim 1 - feasibility: to determine feasibility and acceptability of the intervention. exploratory aim 1 - cognition: compare adults who receive tnt to those who receive no training to determine whether they improve on the cognitive domains trained, show less cognitive iiv across domains and within a task, and demonstrate improved executive functioning. exploratory hypothesis 1: tnt will improve cognitive functioning in the targeted impaired cognitive domains. exploratory hypothesis 2: tnt will reduce cognitive iiv (both overall dispersion \& inconsistency). exploratory hypothesis 3: tnt will improve executive functioning. exploratory hypothesis 4: tnt will improve global cognition and reduce hand severity. innovation 1 - this is the first study to use iiv to guide cognitive training to target the most impaired cognitive domains to reduce cognitive iiv in hiv. innovation 2 - this will be one of the first studies to prospectively include both types of cognitive iiv - dispersion and inconsistency - allowing us to examine the relationship between dispersion and inconsistency. innovation 3 - the epicenter of hiv is in the deep south where this study will occur.

overall -- a pre-post twoe-group experimental design will be used. participants will be recruited from the university of alabama at birmingham (uab) 1917 hiv/aids clinic which has a patient population of +3,600 and is the largest hiv medical provider within 100 miles. eligible participants will be consented at the uab center for research on applied gerontology where a \~2 hr baseline assessment will be administered. participants' neuropsychological data gathered at baseline will be examined to determine a hand classification. only participants with hiv-associated neurocognitive disorder (hand) will be invited to continue with the study. stratified random assignment will ensure an equal number of participants in each group by gender, minority status, and with/without executive functioning impairment (i.e., 1 standard deviation below normative mean). after training, participants will complete a posttest assessment. recruitment/retention strategies. as effective in our studies, recruitment/retention strategies will be used. 1) recruitment materials distributed in the uab 1917 hiv/aids clinic. 2) reminder letters and telephone calls will be used before the scheduled visit. 3) beverages/snacks will be provided (from departmental funds). 5) secondary contact information will be collected to follow up with lost participants. intervention protocol brainhq (posit science inc.) cognitive training modules will be used as in our other studies; these programs have gaming components that encourage adherence. brainhq cognitive training products are tested and endorsed by the scientific community. a meta-analysis of computerized cognitive training in older adults found optimal therapeutic effects occurred when training sessions last at most 60 minutes and are administered 1-3 times per week - dosage parameters already incorporated in our study. this self-administered program uses touch-screen technology with tablets which allows computer novices to engage with the training exercises. the intervention will be administered in the research lab of the uab center for applied gerontology where many of our other studies have been conducted. working with brainhq, when logging on, participants can only receive the individualized cognitive training exercises they are assigned. executive functioning training group. those in the executive functioning training group will engage in exercises requiring one to set shift; that is, to maintain at least two sets of rules and decide which is appropriate to determine the response. in using these training exercises in the training on purpose study (tops), the effects size was quite large (d=-0.89). dosage of 20 hours of training is considered an upper range on how much training is needed to produce an optimal therapeutic effect. targeted neurocognitive training (tnt) group. only two cognitive domains will be targeted for training (10 hrs of training in each, for a total of 20 hours). two or more cognitive exercises may be employed within a cognitive domain. these exercises provide both immediate and intermittent feedback and are customized to the participants' individual ability; the difficulty and/or complexity of each game are systematically decreased/increased based on participants' performance to always be challenging, but not overly frustrating. typically, in an hour session, one exercise (e.g., mental map) will be engaged at a time (20-30 minutes) before switching to another exercise (e.g., hawkeye) in another domain for 20-30 minutes. this helps the participant remain engaged but avoid fatigue. no-contact control group. this group will receive no intervention. as this is a pilot/feasibility study, investigators do not have the resources to provide a contact control group. importantly, in a prior study, investigators established that a no-contact control group and a contact control (sham) group did not significantly differ from each other and both served as an excellent comparison to a cognitive intervention. instruments administration time of the assessment will be \~2 hrs. investigators will use redcap and brainbaseline assessment of cognition and everyday functioning (brace+) tablet for administration of the instruments below to reduce tester burden, tester error, and improve the efficiency of data entry and data management, which will save significant staff time and resources. other cognitive studies as observed in the hiv neurobehavioral research center (hnrc) group employ testing assessments of similar length. brace+ was develop in conjunction with hnrc.

Eligibility criteria:
inclusion criteria: * participants (men \& women) must be 40+ years * english speaking, * have hiv-associated neurocognitive disorder (hand) * willing to meet in person * has time to participate for \~12 weeks exclusion criteria: * participants living beyond 60 miles away from the center * participants living in unstable housing (e.g., halfway house) * participants with significant neuromedical comorbidities (e.g., schizophrenia) * participants with other conditions (e.g., legally blind/deaf, currently undergoing radiation or chemotherapy, or a history of significant brain trauma, diagnosed with covid-19 over the past 3 months) that could impact cognitive functioning or testing. * participants who have received cognitive training within the past three years- -

Keywords: hiv-associated neurocognitive disorder cognitive training executive dysfunction feasibility