Wechsler Adult Intelligence
Wechsler Adult Intelligence
Scales
Scales
David Wechsler devised adult intelligence
David Wechsler devised adult intelligence
test (1939)
test (1939)
Now most widely used measure of
Now most widely used measure of
intelligence for adults and children
intelligence for adults and children
IQ is calculated differently
IQ is calculated differently
Deviation IQ
Deviation IQ
Compare scores to a normative sample
Compare scores to a normative sample
of a similar age
of a similar age
Mean = 100, SD = 15
Mean = 100, SD = 15
Deviation IQ = (z-score *
) +
x
Deviation IQ
Deviation IQ
Average range: 85 to 115
Average range: 85 to 115
“
“
Gifted” range: 130+
Gifted” range: 130+
Mentally retarded: < 70
Mentally retarded: < 70
WAIS-IV Subtests
WAIS-IV Subtests
11 subtests, with 3 supplementary scales11 subtests, with 3 supplementary scales Full scale IQFull scale IQ
Verbal IQVerbal IQ
Performance IQPerformance IQ Index ScoresIndex Scores
Verbal ComprehensionVerbal Comprehension Perceptual OrganizationalPerceptual Organizational Working Memory Working Memory
Verbal Subtests
Verbal Subtests
Vocabulary (VC)Vocabulary (VC)
Define wordsDefine words
Best measure of GBest measure of G
Similarities (VC)Similarities (VC)
Tell how two things are alikeTell how two things are alike Abstract verbal reasoningAbstract verbal reasoning
Information (VC)Information (VC)
Verbal Subtests
Verbal Subtests
Arithmetic (WM)
Arithmetic (WM)
Solve arithmetic problems in your headSolve arithmetic problems in your head
Working memory, mathematical reasoningWorking memory, mathematical reasoning
Digit Span (WM)
Digit Span (WM)
Repeat a list of numbers forwards and Repeat a list of numbers forwards and
backwards
backwards
Performance Subtests
Performance Subtests
Block Design (PO)
Block Design (PO)
Make designs using colored cubesMake designs using colored cubes Spatial and nonverbal reasoningSpatial and nonverbal reasoning
Matrix Reasoning (PO)
Matrix Reasoning (PO)
Given an incomplete pattern, choose from a Given an incomplete pattern, choose from a
number of options how to be complete a
number of options how to be complete a
picture
picture
Performance Subtests
Performance Subtests
Digit Symbol Coding (PS)
Digit Symbol Coding (PS)
Paired associates Paired associates
Each number has a mark put the mark that Each number has a mark put the mark that
goes with the number
goes with the number
Processing speed, learning ability or speed of Processing speed, learning ability or speed of
acquisition
WAIS-IV Subtests
WAIS-IV Subtests
Each subtest assesses slightly different
Each subtest assesses slightly different
mental abilities
mental abilities
All a measure of G
All a measure of G
Multiple measures that assess multiple
Multiple measures that assess multiple
abilities provides a comprehensive
abilities provides a comprehensive
measure of a person’s intelligence
measure of a person’s intelligence
Highly reliable
Highly reliable
