Wechsler Adult Intelligence Scales

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Presentation transcript:

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

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

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

Verbal Subtests Vocabulary (VC) Similarities (VC) Information (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

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

Performance Subtests Block Design (PO) Matrix Reasoning (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

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

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