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WISC-IV (2003)

(2-3-15)

David Wechsler’s view of intelligence

“The global capacity of a person to act purposefully, to think rationally, and to deal effectively with his/her environment.” (1939, p. 229)

Full Scale IQ

  • Verbal IQ
  • Performance IQ

Wechsler intelligence tests

Adult intelligence tests

  • W-B Wechsler-Bellview 1939
  • WAIS Wechsler Adult Intelligence Scale 1955
  • WAIS-R Wechsler Adult Intelligence Scale-Revised 1981
  • WAIS-III Wechsler Adult Intelligence Scale, Third Edition 1997
  • WAIS-IV Wechsler Adult Intelligence Scale, Fourth Edition (2008)

children’s intelligence tests

  • WISC Wechsler Intelligence Scale for Children 1949
  • WISC-R Wechsler Intelligence Scale for Children-Revised 1974
  • WISC-III Wechsler Intelligence Scale for Children, Third Edition 1991
  • WISC-IV Wechsler Intelligence Scale for Children, Fourth Edition 2003

preschool children’s intelligence tests

  • WPPSI Wechsler Primary and Preschool Scale of Intelligence (1967)
  • WPPSI-R Wechsler Primary and Preschool Scale of Intelligence-Revised (1989)
  • WPPSI-III Wechsler Primary and Preschool Scale of Intelligence, Third Edition (2002)

WISC-IV conceptual model

Verbal Conceptual Index

  • Similarities
  • Vocabulary
  • Comprehension
  • (Information)
  • (Word Reasoning)

Perceptual Reasoning Index

  • Block Design
  • Picture Concepts
  • Matrix Reasoning
  • (Picture Completion)

Working Memory Index

  • Digit Span
  • Letter-Number Sequencing
  • (Arithmetic)

Processing Speed Index

  • Coding
  • Symbol Search
  • (Cancellation)

Each subtest yield a standard score (mean = 10, s.d. = 3) based on age norms

An Index Score (mean = 100, s.d. = 15) is generated for each of the four factor areas

A FULL SCALE IQ (FSIQ) is generated based on 10 subtests (3 VCI, 3PRI, 2 WMI, 2 PSI)

  • Standard Score (mean = 100, s.d. = 15)
  • The is a change from the traditional Wechsler model of intelligence: VIQ (Verbal IQ), PIQ (Performance IQ), and composite FSIQ

WISC-V conceptual model: new factor model

Verbal Conmprehension Index

  • Similarities
  • Vocabulary

Visual Spatial Index

  • Block Design
  • Visual Puzzles

Fluid Reasoning Index

  • Matrix Reasoning
  • Figure Weights

Working Memory Index

  • Digit Span
  • Picture Span

Processing Speed Index

  • Coding
  • Symbol Search

Each subtest yield a standard score (mean = 10, s.d. = 3) based on age norms

An Index Score (mean = 100, s.d. = 15) is generated for each of the four factor areas

A FULL SCALE IQ (FSIQ) is generated based on 10 subtests (2 VCI, 2 VS, 2 FR, 2 WM, 2 PS)

  • Standard Score (mean = 100, s.d. = 15)
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