Scientists to scan brains of people with no inner voice

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Registered with the national Social Security system. * Right handed. * Native French speakers. * Visual acuity sufficient to read stimuli (contact lenses permitted). * Willing to follow MRI instructions and recommendations. * Able to provide written informed consent to participate in the study. Exclusion Criteria: * History of known neurological or psychiatric disorder. * Respiratory pathologies (in particular persistent asthma) or cardiovascular diseases. * Speech or language disorders (aphasia, dysphasia, dysarthria, stuttering, etc.). * Hearing impairments. * Memory disorders. * Cognitive impairments limiting understanding of instructions. * Recent use of psychotropic medications. Major treatments not permitted in this research include psychotropic drugs that can alter perception, sensations, mood, consciousness, or behavior, for example: * Antipsychotics (valproic acid, amisulpride, aripiprazole, clozapine, cyamemazine, haloperidol, loxapine, olanzapine, risperidone). * Antidepressants (amitriptyline, citalopram, clomipramine, duloxetine, escitalopram, fluoxetine, mianserin, mirtazapine, nortriptyline, paroxetine, sertraline, venlafaxine). * Anxiolytics. * Pregnant or breastfeeding women. No pregnancy test will be performed at inclusion; pregnancy must be reported by self declaration. * Minors. * Persons deprived of liberty by judicial or administrative decision. * Persons admitted to a health or social institution for reasons other than research. * Adults under legal protection measures (guardianship, conservatorship). * Persons not affiliated with a social security scheme or with a similar scheme only. * Participants refusing to be informed in case of an incidental finding on MRI. * Contraindications to fMRI, including: * Pacemaker, neurosensory stimulator, or implantable defibrillator: risk of transient or permanent device damage or heating of metal parts. In patients with such devices, scanning should be performed only if absolutely necessary, with the patient's informed agreement after clear explanation of risks, and in the presence of a physician from the referring service. * Metallic prostheses: potential for significant artifacts depending on size and ferromagnetic properties; certain neurosurgical clips or cardiac valves may pose problems and require verification of the exact implanted model. * Ferromagnetic ocular or intracranial foreign bodies near nervous structures: risk of displacement and ocular or cerebral injury. * Cochlear implants: risk of demagnetization, electrode heating, and artifacts. * Neurosurgical shunt valves. * Claustrophobic participants. * Dental appliances.