Visual Feedback of Tongue by Ultrasound Echography for Speech Trouble Rehabilitation

Inclusion Criteria: * Articulatory troubles needing speech therapy * French mother tongue * Adult patients \[18 ≥ age \< 80 years\] who underwent buccopharyngeal surgery after cancer diagnostic OR children \[8 ≥ age \< 18 years\] suffering from central nervous system damage Exclusion Criteria: * Incapacity to easily understand the speech therapist instructions * People protected by the law * People deprived from freedom by judiciary decision * Potential allergy to the water-based conducting gel used to ensure good skin - probe contact * Overweight if large fatty mass under chin * Major edema under chin limiting echogenicity * Non corrected vision or hearing problems * For the adults: central or peripheral neural damage * History of Ear, Nose, and Throat surgery or radiotherapy * For the adults: isolated articulatory trouble, former articulatory trouble not treated, disfluency * Massive orofacial dyspraxia * Posture trouble * Motor problem in upper limbs