Clinical Research Directory

Inclusion Criteria: Participants will be screened (see annex 2) to ascertain they fit with all these inclusion criteria: * Be between 18 and 50 years old, * have normal eyesight or eyesight corrected with contact lenses, * Have no neurological disorder, * Not have had a skull fracture or head surgery, * Have no chronic progressive illness or mental deficiency, * Have no metal parts in their body (dental braces or pins, metal plates, pacemakers, implanted prostheses, etc.), * Have no tattoos containing metallic particles or implanted jewellery (e.g. piercings) that cannot be removed, * Not to have worked with metals, * Do not take any medicines or substances that may affect brain function (e.g. drugs, energy drinks, alcohol), * Not to be pregnant or breastfeeding. * Do not be claustrophobic. Exclusion Criteria: Participants presenting a counter-indication (responding yes to one of the questions of the screening questionnaire, see annex 2) to participate will be excluded from participation. Participants will be screened to ascertain they do not present any of these counter-indications to the participation to the MRI measurement. We will exclude people with these characteristics: * Be younger than 18 or older than 50 years old, * have poor eyesight, * Have neurological disorder, * have had a skull fracture or head surgery, * Have a chronic progressive illness or mental deficiency, * Have metal parts in their body (dental braces or pins, metal plates, pacemakers, implanted prostheses, etc.), * Have tattoos containing metallic particles or implanted jewellery (e.g. piercings) that cannot be removed, * have worked with metals, * take medicines or substances that may affect brain function (e.g. drugs, energy drinks, alcohol), * pregnant or breastfeeding. * claustrophobic.