An interventional study of point targets and tactile stimulation in Healthy Volunteers and Optic Ataxia, sponsored by Hospices Civils de Lyon. Recruiting at 1 site in France. Open to participants aged 18 Years to 75 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-01-20.
Sponsored by Hospices Civils de Lyon · Not applicable, Interventional, and Basic science
To produce hand's movement directed towards a target, the investigator must combine several sensory information, such as vision or proprioception. The posterior parietal cortex (PPC) is a region of the cortex involved in this multisensory integration. A lesion of the PPC cause a visuo-motor trouble called optic ataxia but these patients also have perceptual troubles.
The aim of the study is to understand the different functions of the PPC and especially how the processes of spatial coding of the sensory information influences perception and motor planning.
In this study, the investigator want to explore the sensory motor and the perceptual performance of patients with optic ataxia compared with healthy subjects, using 6 behavioral tests.
Objectify the consequences of PPC impairment (visual-motor and perceptual consequences) on patients' quality of life and autonomy.
149 studies on the registry are indexed under Ataxia; 37 are open to participants now.
This study's planned enrollment of 160 is above the median of 30 across 100 interventional studies indexed under Ataxia.
Browse Ataxia studies →Hospices Civils de Lyon is the lead sponsor of 1,866 studies on the registry; 448 are open to participants now.
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Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
All patients and healthy subjects:
Patients:
Exclusion Criteria:
- unable to comply with the tasks (neurological, psychiatric, sensory or motor troubles)
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Behavioral: point targets
Behavioral: point targets
Behavioral: tactile stimulation
Behavioral: visual images
Behavioral: visual images
Behavioral: visual images
In the experiences 1 and 2, the participant needs to point different visual targets (LED) in the dark.
In the experience 3, a tactile stimulation is applied to the middle finger of the 2 hands. The participant needs to indicate into a microphone when he feels the stimulation.
Target dots or visual images are presented on a computer screen. The participant is required to point to the targets or to react as soon as possible by pressing a response button when they are detected.
response error - number of pointing error
Time frame: Day 0 after each stimulation
response error -measure of reaction times
Time frame: Day 0 after each stimulation
response error - percentage of right responses
Time frame: Day 0 after each stimulation
Plan to share: Undecided
No publications or documents are linked to this record.
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