U.S. Department of Health and Human Services
N I H Logo
Cognitive and Emotional Health Project: The Healthy Brain







Intelligence Tests

By selecting | Studies | , you can view those epidemiologic studies which have used a given measure.

o Wechsler Adult Intelligence Scale - Revised (WAIS-R) (Wechsler 1981). There are verbal & performance subscales, which yield Verbal IQ, Performance IQ and overall IQ. There are no norms for persons older than age 74. | Studies |

Subscales:
o Digit Span. Repetition of strings of numbers forwards & backwards. Test of attention & short-term memory.
o Digit Symbol Substitution. A timed test requiring subject to translate numbers into symbols using a key. Measures response speed, sustained attention, visuospatial skills, set shifting. Relatively unaffected by intellectual ability, memory or learning. A sensitive & reliable indicator of brain damage.
o Block Design. Test of visuospatial ability.
o Similarities. Test of verbal abstraction.
o Information. Assesses general fund of knowledge.
o Vocabulary. Assesses knowledge of word meanings.
o Picture Arrangement. Test of visuospatial ability and reasoning.

o National Adult Reading Test (NART) (Nelson 1982). Subject is asked to read aloud 50 words that are not pronounced phonetically. Estimates premorbid IQ | Studies |

o Primary Mental Abilities (PMA) (Schaie et al. 1953). IQ test that includes assessments of Vocabulary, Spatial Skills, Reasoning, Arithmetic skills, Verbal Fluency. | Studies |