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Wechsler Adult Intelligence Scales

WAIS. Wechsler Adult Intelligence Scales. Wechsler Adult Intelligence Scales. David Wechsler devised adult intelligence test (1939) Now most widely used measure of intelligence for adults and children IQ is calculated differently IQ declines as people age. Deviation IQ.

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Wechsler Adult Intelligence Scales

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  1. WAIS Wechsler Adult Intelligence Scales

  2. Wechsler Adult Intelligence Scales • David Wechsler devised adult intelligence test (1939) • Now most widely used measure of intelligence for adults and children • IQ is calculated differently • IQ declines as people age

  3. Deviation IQ • Compare scores to a normative sample of a similar age • Mean = 100, SD = 15 Deviation IQ = (z-score * ) + x = (z-score * 15) + 100

  4. Deviation IQ • Average range: 85 to 115 • “Gifted” range: 130+ • Mentally retarded: < 70 • How does that correspond to SD units?

  5. WAIS-IV Subtests • 11 subtests, with 3 supplementary scales • Full scale IQ • Verbal IQ • Performance IQ • Index Scores • Verbal Comprehension • Perceptual Organizational • Working Memory • Processing Speed

  6. Verbal Subtests • Vocabulary (VC) • Define words • Best measure of G • Similarities (VC) • Tell how two things are alike • Abstract verbal reasoning • Information (VC) • Questions of general knowledge • Crystalized intelligence

  7. Verbal Subtests • Arithmetic (WM) • Solve arithmetic problems in your head • Working memory, mathematical reasoning • Digit Span (WM) • Repeat a list of numbers forwards and backwards • Working memory

  8. Performance Subtests • Block Design (PO) • Make designs using colored cubes • Spatial and nonverbal reasoning • Matrix Reasoning (PO) • Given an incomplete pattern, choose from a number of options how to be complete a picture • Pattern recognition, non-verbal reasoning

  9. Performance Subtests • Digit Symbol Coding (PS) • Paired associates • Each number has a mark put the mark that goes with the number • Processing speed, learning ability or speed of acquisition

  10. WAIS-IV Subtests • Each subtest assesses slightly different mental abilities • All a measure of G • Multiple measures that assess multiple abilities provides a comprehensive measure of a person’s intelligence • Highly reliable • Test-retest correlation = .90

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