3.4 Learning Disability Flashcards
What is the IQ for Mild Learning Disability?
50-69
What is the IQ for Mild Learning Disability?
50-69
What is the IQ for Moderate Learning Disability?
35-49
What is the IQ for Severe Learning Disability?
20-34
What is the IQ for Profound Learning Disability?
0-19
What % of the population has an IQ below 70?
3%
This is 2 SD below the mean
What is the IQ for Moderate Learning Disability?
35-49
What is the IQ for Severe Learning Disability?
20-34
What is the IQ for Profound Learning Disability?
Less than 20
What is the IQ for Borderline Learning Disability?
70+
What % of the population has an IQ below 70?
3%
How is IQ calculated?
IQ= Mental age/Chronological age x 100%
What is the most commonly used tool to diagnose Learning Disability?
Weschler Adult Intelligence Scale- WAIS
Others include: Stanford Binet, Raven’s Progressive Matrices
What are the features of Mild LD? (IQ 50-69)
Mental age 9-
What are the features of Borderline LD? (IQ 70-84)
Mental age 12-
What are the features of Moderate LD? (IQ 35-49)
Mental age 6-
What are the features of Severe LD? (IQ 20-34)
Mental age 3-
What occurs in Prader-willi 15Q mutation (paternally derived)?
LD
Overeating
Self-injurious behaviour
What occurs in Velo-Cardiofacial syndrome 22Q?
50% have LD
increased risk of schizophrenia
What are the trichromosomal abnormalities that cause LD?
Downs syndrome- Trisomy 21, IQ 30-55 (Severe-Moderate LD)
Patau syndrome- Trisomy 13
Edwards syndrome- Trisomy 18
What occurs in cri du chat 5p mutation?
Microcephaly
severe/profound LD (IQ 0-34)
What occurs in Angelman 15Q mutation (maternally derived)
LD
ataxia
paroxysms of laughter
What occurs in Prader-willi 15Q mutation (paternally derived)?
LD
Over-eating
self-injurious behaviour
Which sex chromosomal abnormalities are associated with LD?
45XO - Turner's. LD rare 47XXX- Trisomy X XXY- Klinefelter XYY Male- IQ may be slightly lower Fragile X -mutation is due to faulty FMR1 gene
What other genetic causes of LD are there?
PKU mucopolysaccharidoses neurolipidoses tuberous sclerosis congenital hypothyroidism Lesch nyhan syndrome- X linked (eastern european jewish cluster as well as others)
What pre-natal maternal infections are associated with LD?
Rubella
CMV
Toxoplasmosis