Developmental Language Difficulties: Behavioural and Electrophysiological Studies

Inclusion Criteria (patients): * Non-verbal intelligence quotient (IQ) less than 85 according to the Wechsler Intelligence Scale for Children (WISC) perceptual index * Specific oral language disorders diagnosed by the multidisciplinary team (neurologist, psychologist, speech therapist): understanding language deficit, estimated by the test SCOTLAND (Lecocq, 1996) and / or vocabulary test (Dunn Thiébaud). * Specific written language disorders (dyslexia) diagnosed by a multidisciplinary team according to a test that can objectify the late reading (Alouette) and locate deficits (EVALEC) * Be affiliated to a social security regimen * Have signed an informed consent or signed by the parents if the patient is minor * Aged at least 8 years old Inclusion Criteria (controls) * Non-deficit (\>85) non-verbal Wechsler Scale (codes and matrices) * No specific oral language disorders * No specific written language disorders (dyslexia) * Be affiliated to a social security regimen * Have signed an informed consent or signed by the parents if the patient is minor * Aged at least 8 years old Exclusion Criteria: * Mother tongue other than French * Non-verbal reasoning abilities below 85 measured by the WISC 4 (for patients only) and Non-verbal capacities of reasoning lower than the normal measured by the non-verbal scale of Wechsler (for controls only) * Presence of pervasive developmental disorders * No affiliation to a social security regimen * Absence of signature of the informed consent * Subject of less than 8 years