Week 13 - Intellectual Disability Flashcards
Intellectual Disability has replaced ____ _____
Mental Retardation
3 Key components of an ID:
- limitation in intellectual functioning
- limitation in adaptive functioning
- occurs before age 18
Intellectual Functioning is scored by
IQ
A significant limitation in intellectual functioning is ___ standard deviations (SD) below the mean
2
Etiology often unknown for ____ cases (IQ of 50-70);
cause tends to be known for ___ cases (IQ <50)
mild
severe
a ____ type of changes result in ID
genetic
Two most common Genetic causes of ID (2 syndromes)
- Down Syndrome
* Fragile X syndrome
Down Syndrome cause:
an extra 21st chromosome
Cause of Fragile X syndrome:
a mutation of the fragile site on the X chromosome
____ _____ a degenerative brain and nervous system (neurological) syndrome that results in difficulty with eyesight and processing visual information
Cortical Atrophy
_______ abnormal accumulation of
cerebrospinal fluid in the ventricles of the brain
causing increased intracranial pressure and
progressive enlargement of the skull which can
cause ID
Hydrocephalus
______ a premature fusion of the skull causing
a reduction in space for the brain to grow resulting in
intracranial pressure and ID
Craniostenosis
Not Genetic birth defects:
- Cortical Atrophy
- Hydrocephalus
- Craniostensosis
Environmental Birth Defects:
exposure to chemical agents such as alcohol (fetal alcohol syndrome),
and nonprescription drugs,
maternal conditions
________ condition where blood phenylalanine (amino acid) levels of the mother exceed normal levels causing ID of the fetus
hyperphenylalaninemia