Effectiveness of Attention/executivefunctions Training on Prospective Memory Abilities of Parkinson's Disease Subjects with Mild Cognitive Impairment and Healthy Aged Individuals: a Placebo-controlled Study with a Combined Immersive Virtual Reality and Telemedicine Approach

I.R.C.C.S. Fondazione Santa Lucia60 enrolled

Overview

The goal of this randomized controlled trial is to evaluate the efficacy of attention and executive function training on prospective memory (PM) and executive functions in patients with Parkinson's disease and mild cognitive impairment (PD-MCI) and compare their performance to healthy volunteers. The study aims to determine whether immersive virtual reality (iVR) training can improve PM and executive function performance in PD-MCI patients, whether the effects of training are maintained over time, and how the PM and executive function performance of PD-MCI patients compares to that of healthy volunteers. Participants in the training group engage in real-life scenario exercises focused on planning, shifting, and updating tasks, while those in the placebo group perform simpler daily tasks with lower cognitive demands. Healthy volunteers serve as an additional control group. All sessions are conducted remotely using telemedicine and iVR headsets over a 4-week period. Outcome measures, including PM and executive function performance, are assessed at baseline, post-training, and a 2-month follow-up to evaluate the intervention's effectiveness and compare results across groups.

This study examines the efficacy of attention and executive function training on prospective memory (PM) and executive functions in individuals with Parkinson's disease and mild cognitive impairment (PD-MCI), using a combined immersive virtual reality (iVR) and telemedicine approach. PM impairments, closely linked to deficits in episodic memory and executive functions, are a significant challenge in PD-MCI. Healthy volunteers are included as an additional group, undergoing the same intervention protocol, to evaluate baseline differences and the generalizability of the training effects. Participants are randomly assigned to one of two arms: a training group (TR-C) or an active placebo group (AP-C). Both PD-MCI patients and healthy volunteers in the TR-C group engage in immersive virtual environments featuring real-life scenarios that require planning, task-switching, and updating skills, with tasks progressively increasing in complexity. The AP-C group completes simpler daily tasks with lower cognitive demands, serving as an active control condition. The intervention is conducted entirely remotely using telemedicine platforms and iVR headsets, ensuring accessibility and ecological validity. Assessments of PM and attention/executive functions are conducted at three time points: baseline (T0), post-training (T1, 4 weeks), and follow-up (T2, 2 months). The primary outcomes include improvements in PM performance and executive functions, as well as the retention of these training effects over time. By including healthy volunteers undergoing identical protocols, the study provides a robust comparison to evaluate both intervention-specific benefits and baseline cognitive differences between groups. This research aims to demonstrate the potential of iVR-based cognitive training to improve not only PM but also broader executive functions in both clinical and healthy populations, highlighting the applicability of innovative technologies in addressing cognitive challenges associated with neurodegenerative conditions and promoting cognitive health more broadly.

Interventions

Experimental Cognitive training in Immersive Virtual Reality and Telemedicine approachBEHAVIORAL

The cognitive training involved a 4-week immersive virtual reality program to improve planning, cognitive flexibility, and information updating in patients with mild cognitive impairment related to Parkinson's disease. Over 12 sessions of 30 minutes each, participants trained in a virtual supermarket to strengthen attentional and executive skills. The planning task required creating and following a route to collect items while following rules, with increasing complexity. The cognitive flexibility task involved alternating between selecting items from different categories, with difficulty rising due to more categories and distractors. The updating task, set at a virtual checkout, challenged participants to memorize and recall items on a conveyor belt, with difficulty increasing based on sequence length and item count. Progression to higher levels required three successful trials, with feedback provided to support performance improvement

Active Comparator #1BEHAVIORAL

The active placebo used the same virtual environment, Oculus Go system, and telemedicine setup as the training group, but engaged in tasks with low cognitive demands, mimicking everyday activities. The placebo-planning task involved following a fixed shopping list order in a modified version of the Zoo Map Test. The placebo-shifting task required selecting items from shelves without alternating between categories, while the placebo-updating task involved recalling only the last item from a conveyor belt sequence. The sessions mirrored the training group's structure, with 12 sessions over 4 weeks (3 per week, 30 minutes each), maintaining the same frequency, duration, and levels than Training.

Eligibility

Sex: ALLMin age: 56 YearsMax age: 75 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * PD-MCI: i) idiopathic PD, according with the United Kingdom Parkinson's disease Society brain bank criteria; ii) diagnosis of MCI from neuropsychological screening battery and MMSE; specifically, were included in the study PD-MCI whose performance was 1.5 standard deviations below the normative sample at least on two tests, one of which assessed executive functions; iii) absence of pronounced dyskinesia; iv) absence of other psychiatric and neurological disorders than PD; v) absence of other serious non-neurological disorders; vi) no treatment with deep brain stimulation. All patients had been stably treated with L-dopa and/or dopamine agonists for at least three months prior to the administration of the neuropsychological screening and outcome measures and throughout the duration of the entire experimental protocol. * Healthy Volunteers: i) no neurologic or psychiatric illness; ii) no other disese than neurological; iii) no alchool abuse; iv) neuropsychological screening with rates between 3-4 equivalent score based on normative population Exclusion Criteria: * PD-MCI: i) Cognitive decline inconsistent with mild cognitive impairment; ii) no idiopathic Parkinson's disease; iii) presence of of important non neurological disease; * Healthy volunteers: i) neuropsychological assessment characterized by a cognitive domain with a deficit or a score equivalent to 1 or 2, based on normative data; ii) presence of psychiatric or neurological disease

Outcomes

Primary Outcomes

Prospective Memory Test

Prospective memory was assessed using the Memory for Intentions Screening Test, a task designed to evaluate prospective memory through eight trials: four time-based and four event-based. Each trial reflects real-life scenarios, and participants perform an ongoing word search task simultaneously. Scores for prospective memory range from 0 (failure) to 2 (correct execution). The test includes a multiple-choice recognition task, scored from 0 to 1, with a total score ranging from 0 to 8. A 24-hour delayed task assesses the ability to recall and execute a planned action after a day, such as calling the examiner at a specific time and reporting sleep hours, with scores from 0 (failure) to 2 (successful execution).

Time frame: From baseline to Post-Training (4 weeks)

Planning Tasks

All patients were administered neuropsychological tests at T0, T1 and T2.The assessment of planning skills were tested using the Zoo Map Test and Tower of London

Time frame: From Baseline to Post-Training (4 weeks)

Shifting Task

The assessment of shifting abilities were tested using the Trail Making Test and the Alternate Fluency Task

Time frame: From Baseline to Post-Training (4 weeks)

Updating task

All patients were administered neuropsychological tests at T0, T1 and T2.The assessment of updating was tested using the updating task belonging to the Zimmermann's Test of Every Day Attention.

Effectiveness of Attention/executivefunctions Training on Prospective Memory Abilities of Parkinson's Disease Subjects with Mild Cognitive Impairment and Healthy Aged Individuals: a Placebo-controlled Study with a Combined Immersive Virtual Reality and Telemedicine Approach

Overview

Conditions

Interventions

Eligibility

Locations (1)

Outcomes

Primary Outcomes

Secondary Outcomes