IQ in severe mental retardation –
**Core Concept**
Severe mental retardation, now more commonly referred to as intellectual disability, is a condition characterized by significant limitations in both intellectual functioning and adaptive behavior. It is a neurodevelopmental disorder that affects approximately 1-3% of the global population.
**Why the Correct Answer is Right**
Intellectual disability is classified into four levels of severity: mild, moderate, severe, and profound. Severe mental retardation is characterized by an IQ score below 20-25, which is significantly below the average IQ score of 100. Individuals with severe intellectual disability have significant limitations in adaptive behavior, requiring support in daily life activities such as communication, social interaction, and self-care.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as IQ scores above 20-25 do not meet the criteria for severe intellectual disability. Individuals with IQ scores in this range may be considered to have moderate intellectual disability.
**Option B:** This option is incorrect as IQ scores below 20-25 may be more accurately described as profound intellectual disability, rather than severe.
**Option C:** This option is incorrect as IQ scores above 50 may be considered to have mild intellectual disability.
**Option D:** This option is incorrect as IQ scores below 20-25 may be more accurately described as profound intellectual disability.
**Clinical Pearl / High-Yield Fact**
When assessing an individual's intellectual functioning, it is essential to consider both their IQ score and their adaptive behavior. A low IQ score alone does not necessarily indicate severe intellectual disability, as significant limitations in adaptive behavior are also required for diagnosis.
**Correct Answer:** D.