• Slides: 10

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

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

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

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

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

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

Performance Subtests n Digit Symbol Coding (PS) n n n 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 n n 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 n Test-retest correlation =. 90