Clinical Research Directory

Exploratory Clinical Trial of UX-DA003 Injection for the Treatment of Patients With Parkinson's Disease

This clinical study is designed to explore the safety and tolerability of UX-DA003. It will also explore if UX-DA003 works to improve motor function in subjects with Parkinson's disease.

Treatment of Cognitive and Sensorimotor Deficits in Parkinson's Disease With High Definition Transcranial Direct Current Stimulation

The purpose of this research study is to examine the effects of transcranial Direct Current Stimulation (tDCS) on verbal retrieval and cognition and sensorimotor control and to determine if tDCS can be used as a way to improve retrieval, sensory, and motor abilities in individuals with Parkinson's disease (PD).

Stanford University Neurofiber Study

Parkinson's disease often causes constipation and changes in gut bacteria, but it is not known how quickly a daily fiber supplement changes gut physiology in people with Parkinson's, or how long any change lasts after stopping. This study will test how a daily fiber bar affects bowel function and gut inflammation in people with Parkinson's disease and in household members who live with them. Participants will eat one fiber bar (11 grams of fiber) each day for 3 months, then stop and be followed for one more month, for about 4 months in total. At three points (before starting, after 3 months of fiber, and one month after stopping), participants will collect a stool sample at home and mail it to Stanford in a provided kit, so no clinic visits are needed. Every week, participants will also fill out a short questionnaire about how often they have bowel movements, their bowel regimen, and they will complete a questionnaire about how bowel symptoms affect their daily life. In the lab, we will measure proteins in the stool that are signs of gut inflammation. We want to learn how fast these proteins change when fiber is added, whether changes last after fiber is stopped, and whether people with Parkinson's respond differently than their household partners. We expect that fiber will change gut inflammation and bowel function during the fiber period, and that these changes will differ between people with Parkinson's and their partners after the fiber bars are stopped. Results may help guide future research on diet and gut function in Parkinson's disease.

Effortful Swallow Exercise With Visual Biofeedback for Tongue Strength in Parkinson's Disease

The goal of this clinical trial is to learn whether adding visual biofeedback to an effortful swallow exercise program improves tongue strength and swallowing function in adults with Parkinson's disease. The main questions it aims to answer are: * Does effortful swallow exercise with visual biofeedback increase tongue strength and tongue endurance more than the same exercise without visual biofeedback? * Does visual biofeedback lead to greater improvements in swallowing pressure, swallowing muscle activity, swallowing symptoms, and swallowing-related quality of life? Researchers compared two groups that performed the same effortful swallow exercise program. In one group, participants saw real-time feedback on a tongue pressure device (Iowa Oral Performance Instrument, IOPI) showing when they reached their target swallowing effort. In the other group, participants did the same exercises with verbal instructions only and did not see the device display. Participants: * Attended supervised exercise sessions with a speech-language therapist 3 times a week for 4 weeks (12 sessions in total) * Performed repeated hard saliva swallows in each session, with rest breaks between sets * Completed tongue pressure tests, a surface electromyography test of the muscles under the chin, and swallowing questionnaires before the program and within one week after it ended.

Perception of Action Opportunities for Obstacle Crossing in Parkinson's Disease

The study examines how individuals with Parkinson's disease, compared to healthy older adults, evaluate their ability to cross an obstacle, and the association between this evaluation, motor and cognitive status, and self-awareness. A total of 120 participants aged 65-85 years will be recruited: 60 with Parkinson's disease and 60 healthy adults. Following a telephone screening, eligible participants will be invited to a single session lasting 1.5 to 2 hours at the University of Haifa, a Maccabi Healthcare Services institute, or the participant's home. During the session, following an explanation and the signing of an informed consent form, demographic and clinical data will be collected, anthropometric measurements will be taken, and questionnaires addressing walking confidence and emotional state will be completed. Furthermore, mobility will be assessed using the Timed Up and Go test, motor symptom severity will be assessed using the UPDRS-III (for individuals with Parkinson's disease only), and cognitive function will be evaluated via a computerized test. Finally, participants will perform the research task. In this task, while standing in front of the obstacle, they will be asked to estimate the maximum obstacle height they believe they can safely cross. Following this, they will be asked to actually cross it. Based on these data, the gap between perceived and actual ability will be calculated. The task will be performed under two conditions: without a backpack and with a weighted backpack (carrying approximately 10% of the participant's body weight). The performance of the research task will be video-recorded for the analysis of crossing data.

The Effect of an Auditory Rhythmic Cue on the Frequency of Rolling in Patients With Dysphagia and Parkinson's Disease

The main objective of this clinical study is to measure the effect of rhythmic auditory cueing, introduced in rehabilitation with three weekly sessions over a period of 7 weeks, on the frequency of rolling in idiopathic Parkinson's disease patients using pharyngography (swallowing radiography). The primary question of this study is: Does the rhythmic cueing introduced in rehabilitation significantly reduce the frequency of rolling in dysphagic Parkinson's patients? The researchers will assess the various stages of swallowing before, after, and 3 months after the rehabilitation protocol, focusing on the oral phase to determine if rhythmic auditory cueing reduces the frequency of rolling. Participants will be required to: * Perform three complete assessments (clinical speech therapy examination + pharyngography) before the protocol, after the protocol, and 3 months post-protocol. * Attend three times per week for 7 weeks at the La Musse hospital to participate in the protocol sessions under the supervision of a speech therapist.

Strength and Dual-Task on Sarcopenia in People With Parkinson's Disease

Parkinson´s disease and parkinsonian syndromes are associated with progressive motor and non-motor impairments that may compromise functional independence and quality of life. Sarcopenia, characterized by reduced muscle strength, muscle mass, and physical performance, is highly prevalent in these populations and may contribute to an increased risk of falls, frailty, and disability. This prospective, parallel-group, three-arm randomized controlled trial aims to compare the effects of three levels of physiotherapy intervention on sarcopenia-related parameters and physical function in adults with Parkinson´s disease or parkinsonian syndromes. The Education Group will receive standarized nutritional education and general physical exercise recommendations through structed educational materials, without supervised exercise training. The Progressive Resistance Training (PRT) Group will receive standarized nutritional education and participate in supervised progressive resistance trained combined with cognitive dual-task exercises. The PRT plus Instability Group will receive the same nutritional education, progressive resistance training, and cognitive dual-task training, with additional instability and postural control components. Participants in the two supervised exercise groups will complete two physiotherapy sessions per week for 12 weeks. Assessments will be conducted at baseline (T0), immediately after the 12-week intervention (T1), and four weeks after completion of the intervention (T2). Outcomes will include clinical and functional status, muscle strength, body composition and other sarcopenia-related measures, physical performance, nutritional status, neurocognitive status, number of falls, and Parkinson's disease-related clinical characteristics. The study will evaluate the effects of supervised progressive resistance training compared with an educational intervention and will explore whether adding instability and postural control demands to progressive resistance training provides additional effects on physical function, sarcopenia-related outcomes, and fall-related functional risk in people with Parkinson's disease and parkinsonian syndromes.

Open-Label, Multi-Stage Study to Optimize the Intraputaminal Administration of AB-1005 Using a Prescriptive Infusion Algorithm (PIA)

This study is being done to test a new way of delivering AB-1005 into the brain. The goal is to make the procedure easier and quicker to perform, while providing similar amounts of drug to the part of the brain that needs treatment. Technical (Stage 0) To test if the new delivery method (prefrontal surgical approach) can consistently deliver AB-1005 to the putamen using MRI monitoring. Technical (Stage 1) To test if the new delivery method (PIA-based infusion) can consistently deliver AB-1005 to the putamen using brain imaging by MRI. Technical (Stage 2) To confirm the new delivery method works without brain imaging by MRI, using standard operating room tools including brain imaging by CT. Safety (Stage 1 and 2) To assess the safety and tolerability of the new delivery method for AB-1005 up to 6 months after surgery

Singing Therapy for Rehabilitating Facial Mimicry in Parkinson's Disease: A Randomised Controlled Trial

Parkinson's disease can reduce facial expression and change the voice, making it harder to communicate emotions. This study examined whether practising facial and vocal imitation through speech and singing could improve facial expression and emotional communication in people with Parkinson's disease. Participants were assigned by chance to one of two 13-week programs. In Singing Imitation Therapy, participants watched and listened to recordings of emotional speech and song and copied the facial and vocal expressions. In Singing Observation Therapy, participants watched and listened to the recordings without being instructed to copy them. The main hypothesis was that imitation would lead to greater improvements in facial expression and automatic facial responses to other people's emotional expressions than observation alone.

A Study to Evaluate the Efficacy, PK, Safety, and Tolerability of VIM0423 in Adults With Parkinson's Disease Tremor Insufficiently Responsive to Dopaminergic Therapy

Vista PD is a randomized, placebo-controlled, multicenter study to evaluate the efficacy, PK, safety, and tolerability of VIM0423 in adults with Parkinson's disease tremor insufficiently responsive to dopaminergic therapy. The main objectives of this clinical trial are to determine the following: * Does VIM0423 therapy improve tremor symptoms in adults with Parkinson's disease? * Is VIM0423 well tolerated in individuals with Parkinsons's disease? and * Do the therapeutic effects of VIM0423 confer improvements on daily function and quality of life?

Investigating the Increased Risk of Falls in Individuals With Parkinson's Disease Treated With Deep Brain Stimulation

The purpose of this pilot study is to assess changes in thinking and movement after deep brain stimulator implantation. The study will also examine whether these changes are related to the risk of falls.

A Phase 1 Study of NCR201 in Parkinson's Disease Patients With Prior DBS

This is a Phase 1 clinical trial to evaluate the safety and tolerability of a new cell therapy called NCR201. The study will enroll adults with moderate-to-advanced primary Parkinson's disease who have previously undergone deep brain stimulation (DBS) surgery. NCR201 is an investigational cell therapy derived from hypoimmune human induced pluripotent stem cells (iPSCs). Participants will receive a one-time surgical injection of NCR201 directly into a specific brain region (the putamen) on both sides. The study will use a standard "3+3" design to test two different doses: a low-dose group (4 million cells per side) and a high-dose group (8 million cells per side). The primary goal of this study is to check for any severe, dose-limiting side effects within the first 8 weeks after surgery, and to determine the maximum tolerated dose or the recommended dose for future Phase 2 studies. Researchers will also look for any initial signs of clinical benefit. Participants will be closely monitored through regular safety and symptom assessments for up to 96 weeks, with an optional long-term safety follow-up lasting an additional 3 to 5 years.

Oculomotor-Pupillary AI Biomarkers in Parkinson's

The goal of this prospective observational study is to investigate whether oculomotor-pupillary abnormalities detected using a novel edge-AI eye-tracking device can serve as objective and quantitative biomarkers for the early screening and clinical evaluation of Parkinson's disease (PD). The study will include individuals with early-to-moderate PD and healthy controls. The main question it aims to answer is: Can oculomotor-pupillary abnormalities detected by a novel edge-AI eye-tracking device serve as objective and quantitative biomarkers for the early screening of Parkinson's disease? Researchers will compare oculomotor-pupillary parameters between participants with PD and healthy controls and evaluate the ability of these parameters to distinguish PD from healthy controls. Participants with PD will also be followed for 12 months to assess longitudinal changes in eye-tracking measures and their associations with clinical changes. Participants will: 1. Complete standardized eye-tracking tasks to assess oculomotor and pupillary function using the study eye-tracking device. 2. Undergo clinical assessments of motor function, cognitive function, and non-motor symptoms. 3. For participants with PD, attend follow-up assessments over 12 months to evaluate changes in eye-tracking and clinical measures. The study will also evaluate the feasibility and clinical application of the independently developed edge-AI eye-tracking system and develop and validate lightweight real-time models for PD classification and prediction of disease progression.

Cortical Network Modulation by Subthalamic Nucleus DBS

Deep brain stimulation of the subthalamic nucleus (STN DBS) in Parkinson's disease (PD) can provide substantial motor benefit yet can also produce unwanted mood and cognitive side effects. Although the neural mechanisms underlying benefits and side effects are not well understood, current hypotheses center on the potentially measurable yet currently undefined effects within downstream cortical networks. Limitations of current tools have impeded attempts to assess network connectivity directly and dynamically in humans with implanted DBS; PET lacks the necessary temporal resolution while fMRI is neither optimal nor safe for patients with implanted DBS. In this proposal, to overcome these significant limitations, the investigators apply high-density diffuse optical tomography (HD-DOT) methods to investigate how STN DBS modulates cortical functional networks and behavior in PD patients. HD-DOT uses a collection of functional near-infrared spectroscopy (fNIRS) measurements, free of radiation exposure concerns, and without electrical/metal artifacts or contraindications or safety concerns for DBS. However, common fNIRS systems are critically hampered by typically sparse measurement distributions that lead to poor anatomical specificity, unreliable image quality due to crosstalk with scalp signals, poor spatial resolution, limited field of view, unstable point spread functions, and uneven spatial coverage. HD-DOT solves these problems by using high-density interlaced source and detector imaging arrays that support densely overlapping measurements and anatomical head models that together result in higher spatial resolution, stable point spread functions, and greatly improved isolation of brain signals from scalp signals. The investigators have demonstrated that HD-DOT accurately maps functional connectivity (FC) within and between cortical resting state networks (RSNs) in the outer \~1cm of cortex with comparable temporal and spatial resolution to fMRI. Preliminary data in older controls and STN DBS patients that directly establish validity and feasibility for the proposed studies are provided. A recent comprehensive evaluation of FC in PD (without DBS) using fMRI found reduced within-network FC in visual, somatomotor, auditory, thalamic and cerebellar networks and reduced between-network FC involving predominantly cortical RSNs (somatomotor, sensory and association), some of which correlated with cognitive and motor dysfunction in PD. Notably, striatal RSNs were not abnormal. These data suggest that PD affects the interrelationships of cortical networks in a behaviorally meaningful way, far downstream of focal subcortical neuropathology. STN DBS is known to alter activity in downstream cortical regions that function as nodes within these dynamic cortical networks supporting movement and cognition. Thus, cortical network FC may play a critical role in mediating the impact of STN DBS on motor and non-motor behavior. Location of the stimulating contact may further modulate these downstream effects, due to the complex functional organization of the STN region. Study procedures include motor and cognitive tests, questionnaires, HD-DOT scanning, and MRI scans. The investigators propose to investigate how STN DBS influences downstream cortical network FC using HD-DOT. This information could lead to more efficient clinical optimization of DBS, identify potential cortical targets for less invasive neuromodulation, and lay the groundwork for future more complex experimental manipulations to determine the full range of STN DBS-induced cortical network responses to up-stream focal electrical perturbations, revealing fundamental properties of functional network plasticity.

Effect of Artificial Intelligent-based Training and Benson Relaxation Exercises on Caregiver Burden and Stress Levels in Caregivers of Patients With Parkinson's Disease

The aim of this study is to evaluate the effect of artificial intelligence-supported training and the Benson relaxation exercise on the care burden and stress levels of caregivers of people with Parkinson's disease. In the study, caregivers of people with Parkinson's disease will receive training on caring for people with Parkinson's disease and on the Benson relaxation exercise. The training sessions will be conducted using an artificial intelligence-based module. Participants will be randomly assigned to three groups: a training group, an exercise group, and a control group. A caregiver information form, the Modified Hoehn and Yahr Scale, the Zarit Caregiver Burden Scale, and the Caregiver Stress Scale will be used to collect pretest data from all participants during the initial interview. The training sessions for the experimental group will last 4 weeks. No training will be provided to the control group. Four weeks later, the Zarit Caregiver Burden Scale and the Caregiver Stress Scale will be used to collect final test data from the experimental and control groups. The hypotheses related to this study are as follows: * Artificial intelligence-supported training provided to caregivers of people with Parkinson's disease affects the burden of care. * The Benson relaxation exercise provided to caregivers of people with Parkinson's disease affects the burden of care. * Artificial intelligence-supported training provided to caregivers of people with Parkinson's disease affects stress levels. * The Benson relaxation exercise administered to caregivers of people with Parkinson's disease affects stress levels.

Effects of Vagal Nerve Stimulation on Leg Muscle Activity and Posture in Parkinson's Disease

This study is designed to better understand the mechanisms contributing to impaired activation of leg muscles in people with Parkinson's disease (PD) and to test if stimulation of a nerve at the neck can improve muscle activation, walking and balance.

Objective Longitudinal Monitoring of Postural Stability and Gait During Neurorehabilitation: Clinical Application of Instrumented Posturography and Three-Dimensional Motion Analysis

Nowadays, stroke is one of the most common leading causes of death in many countries. As the number of stroke patients is increasing, even in younger age groups, there is an increasing need to improve their rehabilitation. In order for this process to start, it is inevitable to integrate the latest recommendations of health and sports science into rehabilitation, in addition to medicine, so that the treatment is as complex as possible. Parkinson's disease is one of the most common neurological diseases, in addition to stroke. The most significant damage can be experienced in motor functions, since one of the main symptoms of the disease is slowed movement, tremor and balance disorders. This postural change can lead to many other musculoskeletal changes, which is why Parkinson's disease is an extremely complex disease that also requires a complex treatment. The third disease examined in our research is multiple sclerosis (MS), which is also one of the most significant nervous system diseases, with nearly 1 million cases registered so far. The most common symptoms of MS patients are weakness, numbness, dizziness, coordination and balance disorders, as well as changes and uncertainty in the gait pattern. One of the essential foundations of rehabilitation after neurological diseases is neurorehabilitation, since the process will only be truly effective if cognitive and motor functions are developed in parallel. In the case of neurological diseases, as we can see above, one of the most significant symptoms is coordination and balance disorders. When the nervous system is affected, trunk control and the patient's posture will always change, depending on the given disease and the individual. One of the fundamental goals of rehabilitation should be to develop stability and postural control, because without these, we will not be able to effectively develop and restore the patients' significant motor functions. This is why it is important that neurological patients are assessed from this perspective as early as possible, so that their treatment plan can be adapted to their disease and themselves as much as possible.

Effectiveness of a Home-Based Exercise Program Supported by Self-Management Education in People With Parkinson Disease

This randomized, assessor-blinded clinical trial evaluates whether a structured self-management education and home exercise program improves balance, walking capacity, fall-related concerns, upper-extremity dexterity, and quality of life in adults with Parkinson disease. Fifty-five participants aged 45-80 years will be randomized to an intervention or control arm. Outcomes will be assessed at baseline, after the 8-week intervention, and at Week 16. The primary outcome is the Berg Balance Scale.

Wearable for Assessing Tremor and Continuous Health in Parkinson's Disease and Essential Tremor

This prospective observational study will examine tremor and upper-limb movement in adults with Parkinson's disease or essential tremor using non-invasive wearable sensors. Participants will attend one clinic visit and may then wear sensors at home for 3, 7, or 21 days. Clinic assessments will be scheduled around participants' usual medication times; the study will not change or delay treatment. Sensor data will be analysed offline for research and will not be used to make clinical decisions.

SwallowFIT Study in Parkinson's Disease

The goal of this clinical trial is to learn if a proactive swallow exercise will help to improve swallow fitness in patients with Parkinson's disease. The aim of the study is to assess how effective this exercise is and to measure the change in swallowing fitness from the beginning to the end of the study. Patients who are given the exercise training will be compared to participants who are treated using the usual standard treatment. Patients will have 6 weeks of twice-weekly SwallowFIT training. Each session will be an hour long.

Spinal Mobility, Rigidity, and Kinesiophobia in PD and TMD

Axial rigidity and loss of spinal mobility commonly observed in Parkinson's disease (PD) lead to postural deformities and substantial reductions in trunk flexibility. This condition can impair the biomechanics of the craniocervical and lumbopelvic kinetic chain, potentially exerting a negative impact on temporomandibular joint (TMJ) functions. In this context, the planned study aims to determine whether differences exist in spinal mobility, axial rigidity, and kinesiophobia levels between individuals with PD with and without Temporomandibular Disorders (TMD), and to investigate whether a biomechanical relationship exists between TMD and spinal mobility, axial rigidity, and kinesiophobia levels in this population. The study will be conducted face-to-face at the Neurology Outpatient Clinic of Hatay Mustafa Kemal University Research and Training Hospital. Individuals aged 40-75 years, diagnosed with PD, staged between 1.5 and 4 according to the Hoehn and Yahr Scale, with a Mini-Mental State Examination score of 24 or higher (MMSE ≥ 24), and in the "ON" state during the evaluation will be included. Individuals with a history of cervical, lumbar, maxillofacial, or TMJ surgery that could directly affect spinal mobility and posture; acute orthopedic or rheumatologic disorders that would preclude testing (e.g., advanced Ankylosing Spondylitis); comorbid neurological conditions (e.g., stroke, multiple sclerosis); complete edentulism or severe disruption of oral anatomy; active toothache; pregnancy or suspected pregnancy; and severe psychiatric disorders will be excluded. Written informed consent will be obtained from all participants, and the study will be conducted on a voluntary basis. All data will remain confidential and be utilized solely for scientific purposes. In this cross-sectional study, evaluations will be carried out in a single session for each participant. Following the recording of demographic and clinical characteristics, the presence of TMD will be assessed using the Fonseca Anamnestic Index, jaw range of motion with a millimeter ruler, and spinal mobility using the modified-modified Schober test, tragus-to-wall distance, intermalleolar distance, and occiput-to-wall distance measurements. Axial rigidity will be evaluated using item 3.3 (Rigidity) of the Movement Disorder Society-Sponsored Revision of the Unified Parkinson's Disease Rating Scale (MDS-UPDRS), posture will be assessed using MDS-UPDRS item 3.13 (Posture) alongside craniovertebral angle measurement, and kinesiophobia will be assessed via the Tampa Scale for Kinesiophobia. The resulting findings are expected to contribute to understanding the impact of spinal mobility, axial rigidity, and kinesiophobia on the temporomandibular system in PD, offering valuable clinical guidance for assessment, physiotherapy, and multidisciplinary neurological rehabilitation pathways.

Engage-PD: a Physical Activity Coaching Program Via Telehealth for People With Parkinson's Disease. A Single-cohort Study in Spain.

Engage-PD is a single cohort evaluation of implementation of a telehealth-delivered physical activity coaching program for people with early-mid stage Parkinson's disease in Spanish population. The program utilizes a physiotherapist to provide one-on-one coaching for individuals with early-mid stage Parkinson's disease to provide individualized structured support to facilitate and optimize exercise uptake as part of an effective self-management program. BACKGROUND: Parkinson's disease is a progressive neurodegenerative condition for which there is currently no cure. Physical activity and exercise have demonstrated benefits for motor and non-motor symptoms, functional performance, and brain structure and function. Exercise, particularly at higher intensities, may also provide neuroprotective and neurorestorative effects and may be especially important during the early stages of the disease. Despite these potential benefits, people with Parkinson's disease are substantially less active than healthy adults, and physical activity declines as the disease progresses. Perceived barriers, including low expectations of exercise benefits, limited time, fear of falling, and lack of motivation, may contribute to reduced participation. Despite this, there is limited research examining interventions specifically designed to increase and maintain aerobic exercise. OBJECTIVE: This study aims to investigate the feasibility and acceptability of a theory-based behavioural change program designed to increase aerobic exercise participation in Spanish population. The study will also examine whether the intervention can improve exercise self-efficacy and motivation and reduce perceived barriers to physical activity. METHODOLOGY: A single cohort of people with Parkinson's disease in the stages of Hoehn and Yahr I-III who are willing to participate in the 3-month Engage-PD program, which consisted of up to 5 telehealth coaching sessions delivered by a trained physical therapist expert in Parkinson's disease. Feasibility is evaluated based on recruitment and retention rates, along with participants' feedback. Planned and unplanned physical activity, exercise self-efficacy, and individualized goals are assessed pre- and post-intervention. Relationships between baseline characteristics and changes in planned PA and ESE are also evaluated. SIGNIFICANCE: A behavioural change program that integrates instrumental, emotional, and informational support may help individuals with early-stage Parkinson's disease establish sustainable exercise habits and incorporate physical activity into daily routines. Physiotherapists may play an important role in supporting these behavioural changes by addressing physical performance, self-management, cognitive-behavioural strategies, and environmental factors that influence participation in exercise.

Feasibility of a Community-Based Multimodal Exercise Programme in Parkinson's Disease

This study aims to evaluate the feasibility and preliminary effectiveness of a multimodal, group-based but individualised therapeutic exercise programme for people with Parkinson's disease delivered within a real-world community-based patient association setting. The primary objective is to assess the feasibility of implementing the programme, including recruitment, consent, adherence, intervention completion, acceptability, perceived exertion and safety. Secondary objectives are to obtain preliminary comparative information regarding the effects of the intervention on motor and non-motor symptoms, physical fitness, pain-related outcomes and exercise-induced hypoalgesia. This is a non-randomized sequential feasibility study including an intervention group participating in a 12-week multimodal exercise programme and a matched non-exercise control group maintaining usual activities. Outcomes will be assessed at baseline, post-intervention and 6-month follow-up.

The Role of Priors in Hallucinatory Perception in Parkinson's Disease

The goal of this observational study is to better understand the mechanisms of hallucinations in patients with Parkinson's disease. The main question it aims to answer is: Do prior expectations increase the rate of false perceptions during a visual stimulus detection task more in Parkinson's disease patients with visual hallucinations compared to those without? Participants will undertake a computer task involving face detection and a battery of neuropsychological tests.