Brain-computer interfaces (BCIs) allow direct communication between men and computers thanks to the analysis of brain activity. Current applications of BCIs in assistive technologies are: palliative communication systems for patients with complete muscular paralysis and restoration of movement for people with a motor in firmity (orthetic or prosthetic devices controlled by the thought). It appears today that brain-computer interfaces can also be used in therapeutic approaches to rehabilitation or functional recovery through neurofeedback. In this paper we briefly review several therapeutic uses of brain-computer interfaces and present a clinical experiment with an hemiparetic patient who has used a BCI as a motor rehabilitation tool.