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MRI Study of Saccadic Adaptation

Not Applicable
Completed
Conditions
Healthy Volunteers
Interventions
Behavioral: fMRI
Registration Number
NCT03488082
Lead Sponsor
Hospices Civils de Lyon
Brief Summary

Accurate execution of our directed behaviors in the immediate environment allows the vast majority of our daily activities. Through the movements of our eyes and different parts of our body, we perceive, explore and act on our environment and can exchange and communicate with others. The mechanisms of sensorimotor adaptation of saccades (saccadic adaptation) contribute on the one hand to maintain the accuracy of saccades in the short, medium and long term, by opposing the deleterious effects of various physiological changes (development, aging), pathological or environmental (optical corrections).

The aim of this study is to identify neuronal structures and networks involved in saccadic adaptation through the study of brain metabolic activation (BOLD) during the development of the adaptation of reactive saccades. The study will be organized in a single session with 3 runs. Each run include 4 blocks: 3 include the double-step target paradigm RND, U+, U-) and one without target jump (STA). The 'U+'/ 'U-'blocks include saccadic trials with forward/backward displacement of the target during a targeting saccade, the 'RND' block include saccadic trials with random target jump (forward or backward) and the 'STA' block are trials without displacement of the target. Each subject will make 12 repetitions of the 4 blocks.

Detailed Description

Not available

Recruitment & Eligibility

Status
COMPLETED
Sex
All
Target Recruitment
36
Inclusion Criteria
  • Age: 18 to 40 years included,
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Exclusion Criteria
  • Known ophthalmological or neurological pathology,
  • Non-stabilized medical condition,
  • Taking psychotropic treatment,
  • No fluency in reading in French,
  • Pregnant and / or breastfeeding woman
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Study & Design

Study Type
INTERVENTIONAL
Study Design
SINGLE_GROUP
Arm && Interventions
GroupInterventionDescription
Measurement of the bold signalfMRI-
Primary Outcome Measures
NameTimeMethod
BOLD signalthroughout the behavioral experiment at Day 1

cerebral activations with fMRI measures when the subject fixates or shifts gaze toward visual targets (behavioral tasks).

Secondary Outcome Measures
NameTimeMethod
Eye movementsduring the development of saccadic adaptation (throughout the behavioral experiments at Day 1)

measurement of the eye movements (saccades) of the subject while fixating and shifting gaze toward visual targets (behavioral tasks).

Trial Locations

Locations (1)

Inserm U1208

🇫🇷

Bron, France

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