 This is a pilot study for which 15 patients with myopathies will be included. The primary objective of the study is to assess the safety and tolerance of a system for communication named P300 speller. The P3Speller is a brain computer interface BCI that records the brain electric activity with the use of electroencephalography EEG and analyzes it in real time in order to identify slight changes generated in relation to a visual stimulation evoked potentials. The identification of such brain potentials is translated into a digital command for a spelling device. The secondary objective of this study is to compare the efficacy of this spelling device with a more traditional assisitve technology called scanner interface. A scanner interface uses single clicks that can be obtaines with an adequate interface which exploits the remaining muscular activity from a patients. 