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Intelligence tests

Intelligence tests. Wechsler Tests Info on David Wechsler. Wechsler Adult Intelligence Scale – WAIS. Original in 1939 – W-B I WAIS-IV - 2008 Ages 16 through 90. Wechsler Intelligence Scale for Children WISC. Original in 1949 Ages 6 through 16 WISC-R in 1974 WISC-IV in 2003 .

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Intelligence tests

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  1. Intelligence tests Wechsler Tests Info on David Wechsler

  2. Wechsler Adult Intelligence Scale – WAIS • Original in 1939 – W-B I • WAIS-IV - 2008 • Ages 16 through 90

  3. Wechsler Intelligence Scale for Children WISC • Original in 1949 • Ages 6 through 16 • WISC-R in 1974 • WISC-IV in 2003

  4. Wechsler Preschool and Primary Scale of IntelligenceWPPSI • Original in 1963 • Ages 3 to 7 years • WPPSI-III in 2002

  5. Common featuresof Wechsler tests • Full Scale IQ • 2 major second level categories • 12 – 15 subtests • Individually administered • 50-70 minutes administration time • Normative data • Comprehensive manuals

  6. Revisions: • More contemporary – words, pictures, terms • More culture free • Better norms • More theoretical base (CHC model) Link to information on CHC model

  7. Cattell-Horn-Carroll (CHC)model • General factor of intelligence (g) • Started with Gf-Gc theory (fluid/crystallized) • Specific abilities (number varies)

  8. CHC model

  9. Test scores • Full Scale IQ Verbal Comprehension index Perceptual Reasoning index Working Memory index Processing Speed index

  10. Sub-tests • Picture completion • Information • Coding • Similarities • Picture arrangement • Arithmetic • Block design • Vocabulary • Object assembly • Comprehension • Symbol search • Digit span • Mazes

  11. WAIS - IV

  12. Psychometrics • Reliability - Internal consistency • Verbal = .97 • Performance = .93 • Split half = .95 • Validity – multi-trait • High correlation with Binet

  13. Web info on WISC IV • Model of WISC IV • Psychometrics of WISC IV

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