Inclusion Criteria- >18 years
- a single hemispheric cerebral vascular lesion more than 6 months previously
- able to walk 10 meters without any assistance
- having benefited of at least 2 consecutive BTI sessions, second 3D gait analysis performed at least 3 months after the last BTI.
Exclusion Criteria- patient's refusal to participate to the study
- Inability to read the selected text
- Inability to cooperate
- No affiliation to social security