Ψlogical
Testing
Chapter 10
Intelligence (Part II)…
…the Wechsler Scales
Intelligence (Part II)…
…the Wechsler Scales
🕸 🕸 House keeping 🕸 🕸
- Class Poll
- Lab
- Exam
- Feedback
- 2 groups still need to submit draft 5 items
Note
Remember to e-mail me if you’d like to discuss exam-taking strategy
David Wechsler
Intelligence is…
…the capacity to:
- act purposefully
- think rationally
- deal effectively with one’s environment
“Nonintellective” factors
- factors other than intelligence that impact intelligent behavior
- attitude
- motivation
- experience
- emotional functioning
Competitor to Binet–Simon
- Wechsler–Bellevue Intelligence Scale (Wechsler, 1939)
- adult–appropriate
- TWO aggregate scores
- nonverbal components (aka performance scale)
- scoring (points per item)
Wechsler Adult Intelligence Scale(s)
Five1 modern revisions to the 1939 original:
- WAIS (Wechsler, 1955)
- WAIS–R (Wechsler, 1981)
- WAIS III (Wechsler, 1997)
- WAIS IV (Wechsler, 2008)
- WAIS 5 (Wechsler et al., 2024)
The “Modern” WAIS
WAIS IV decided to measure separate abilities instead of one or two “global” constructs
- “g” results from an interplay of these specific abilities
WAIS terminology
- index
- aggregation of subtests to multidimensional scale
- subtest
- item groupings focused on unidimensional construct
Subscales (WAIS IV)
- Vocabulary
- Similarities
- Information
- Picture completion
- Block design
- Matrix reasoning
- Arithmetic
- Digit span
- Letter–number sequencing
- Digit symbol–coding
- Symbol search
Activity!!
…let’s take another test!!
- Mix of WAIS subtest item–types
- timed (12-minutes)
- more FUN!!! 🥳
Scoring
- raw subtest scores transformed to scale score with \(\mu\)=10 & \(\sigma\)=3
- index scores are summaries of the subtest scale scores
- scaled to the typical \(\mu\)=100 & \(\sigma\)=15
- FSIQ a summary of index scores
Pattern analysis
- with multiple scales comes the opportunity to look for patterns across subtests or indexes
- unique combinations of low and high scores
- aka profile
- also very popular with MMPI & other clinical tests
Extensions of WAIS
- Wechsler Intelligence Scale for Children
- aka WISC 🧒
- 6–17 yo
- Wechsler Preschool and Primary Scale of Intelligence
- aka WPPSI 👶
- 2.5–8.5 yo
Factors other than intelligence that impact intelligent behavior are called…
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The most recent WAIS was published in…
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Wechsler referred to his nonverbal aggregate as a/an ______________ scale
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Patterns of performance across intelligence subscales form a…
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Which of these intelligence tests was historically focused on “g” as opposed to specific abilities?
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References
Wechsler, D. (1939). Wechsler–bellevue intelligence scale. New York: The Psychological Corporation.
Wechsler, D. (1955). Manual for the wechsler adult intelligence scale. New York: The Psychological Corporation.
Wechsler, D. (1981). WAIS–R: Wechsler adult intelligence scale–revised. New York: The Psychological Corporation.
Wechsler, D. (1997). Wechsler adult intelligence scale–third edition (WAIS–III). New York: The Psychological Corporation.
Wechsler, D. (2008). Wechsler adult intelligence scale–fourth edition (WAIS–IV). New York: The Psychological Corporation.
Wechsler, D., Raiford, S. E., & Presnell, K. (2024). Wechsler adult intelligence scale (5th ed.): Technical and interpretive manual. NCS Pearson.
Ψlogical Testing Chapter 10 Intelligence (Part II)… …the Wechsler Scales