This study will help to better characterize oral and written language disorders and determine if these disorders are continuous or not. The participants ( dyslexic and dysphasic patients and control adults) will carry out an auditory lexical decision task during which an electroencephalogram (EEG) will be recorded.

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

The study population consists of 3 groups. A group of volunteers (controls), a group of patients with oral language disorders, a group of patients with written language disorders.