DO (IQ) 4

Question 1

During a developmental assessment, a 6-year-old achieves a mental age of 9 years. Using the ratio IQ formula, what is this child's IQ?

Accepted Answer

150

Answer

Ratio IQ = (mental age / chronological age) × 100 = (9/6) × 100 = 150.

Question 2

A physician is counseling parents whose child has an IQ of 65. Which educational placement is MOST appropriate under IDEA in the US?

Accepted Answer

Least restrictive environment with individualized education plan (IEP)

Answer

IDEA mandates that students with disabilities receive education in the least restrictive environment with appropriate IEP supports.

Question 3

Which neurotransmitter system has been most consistently linked to cognitive enhancement and IQ-related performance in pharmacological research?

Accepted Answer

Dopaminergic and cholinergic systems

Answer

Dopamine and acetylcholine are central to working memory, attention, and executive function — the cognitive domains most closely correlated with IQ scores.

Question 4

A patient with an IQ of 68 and significant adaptive deficits is being evaluated for informed consent to participate in a research study. The most appropriate first step is:

Accepted Answer

Assess the patient's specific decision-making capacity for this protocol

Answer

Decision-making capacity is task-specific; IQ alone does not determine capacity — the physician must assess understanding, appreciation, reasoning, and communication for this specific decision.

Question 5

Which heritability estimate for IQ in adults, derived from twin studies, is most consistent with the current scientific literature?

Accepted Answer

60–80%

Answer

Twin and adoption studies consistently estimate IQ heritability in adults at approximately 60–80%, with environmental factors accounting for the remainder.

DO - Doctor of Osteopathic Medicine Practice Test

DO - Doctor of Osteopathic Medicine Practice Test

DO (IQ) 4