Communication by Brain - Computer Interface in Amyotrophic Lateral Sclerosis:Feasibility Study

Inclusion Criteria: * age \>= 18 * have a diagnosis of ALS suspected, possible, probable with EMG * be able to follow the study process and to comply with the schedule of visits upon entry into the study * understand the purpose of the study * expressing P300 wave in the conditions of the study Exclusion Criteria: * have a mental illness or clinical dementia defined clinically significant may hinder the patient's ability to follow the procedures of the study * have a significant history of photosensitive epilepsy * have a history of allergy to the gel used for the electrodes * Major protected by law (guardianship, curators) * have uncorrectable visual disorders * not being able to maintain a sitting position and focus on a computer screen for more than 30 min.