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Introducing the WAIS–IV

Copyright © 2008 Pearson Education, inc. or its affiliates. All rights reserved.

Overview
• • • • Introduction Revision Goals Test Structure Normative / Validity / Clinical Information

Copyright © 2008 Pearson Education, inc. or its affiliates. All rights reserved.

Wechsler’s View of Intelligence
"The global capacity of a person to act purposefully, tothink rationally, and to deal effectively with his/her environment.“

Wechsler, David (1939). The measurement of adult intelligence. Baltimore: Williams & Wilkins, p. 229.

Copyright © 2008 Pearson Education, inc. or its affiliates. All rights reserved.

WAIS: A Historical Perspective
Wechsler-Bellevue Wechsler-Bellevue II WAIS WAIS-R WAIS-III WAIS-IV 1939 1946 1955 1981 1997 2008

Copyright© 2008 Pearson Education, inc. or its affiliates. All rights reserved.

Revision Goals

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Update Theoretical Foundations
– Eliminate Dual IQ/Index Score Structure
• Consistent with WISC-IV

– Enhance Measure of Fluid Intelligence
• Develop additional measure of fluid reasoning: Figure Weights

– EnhanceMeasure of Working Memory
• Revise Arithmetic and Digit Span to emphasize WM

– Enhance Measure of Processing Speed
• Develop additional PS subtest: Cancellation

Copyright © 2008 Pearson Education, inc. or its affiliates. All rights reserved.

Enhance Clinical Utility
• Co-normed with the Wechsler Memory Scale-IV • Additional Special Group Studies (e.g., Mild Cognitive Impairment,Borderline Intellectual Functioning) • Develop an Upgrade Kit in 2009 for Specialists (e.g., Geropsychologists & Neuropsychologists)

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Improve Psychometric Properties
• Update Norms • Expand FSIQ Range • Improve Floors and Ceilings • Maintain or improve subtest and composite reliability • Provide initial evidence ofvalidity

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Enhance User-Friendliness

• • • • •

Reduce Testing Time Revise Instructions Redesign Record Form Increase Portability Separate WAIS-IV and WMS-IV Technical Manuals

Copyright © 2008 Pearson Education, inc. or its affiliates. All rights reserved.

Increase Developmental Appropriateness
•Add demonstration and sample items • Reduce vocabulary level of instructions • Drop Object Assembly • Reduce emphasis on motor demands • Reduce emphasis on time-bonus • Enlarge visual stimuli • Eliminate auditory concerns on DS and LN

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Test Structure

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Test Structure
Verbal Comprehension Scale Core Subtests Similarities Vocabulary Information Supplemental Subtests Comprehension Perceptual Reasoning Scale Core Subtests Block Design Matrix Reasoning Visual Puzzles New! Supplemental Subtests Picture Completion Figure Weights (16-69) only New!

Ages 16:0 – 90:11

FSIQ
Working Memory Scale Core Subtests Digit SpanArithmetic Supplemental Subtests Letter-Number Sequencing (16-69 only) Processing Speed Scale Core Subtests Symbol Search Coding Supplemental Subtests Cancellation (16-69 only) New!

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Subtest Modifications
• 4 Subtests Dropped – Object Assembly, Picture Arrangement, Coding Recall (Digit Symbol-Incidental Learning),and Coding Copy (Digit Symbol-Copy) • 12 Subtests Retained with Modifications – Similarities, Vocabulary, Information, Comprehension – Block Design, Matrix Reasoning, Picture Completion – Digit Span, Arithmetic, Letter-Number Sequencing – Symbol Search, Coding • 3 New Subtests – Visual Puzzles, Figure Weights, Cancellation
Copyright © 2008 Pearson Education, inc. or its affiliates. All rights...
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