wechsler adult intelligence scale fourth edition (wais-iv)
TRANSCRIPT
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Introducing the WAIS–IV
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Overview
• Introduction• Revision Goals• Test Structure• Normative / Validity / Clinical Information
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Wechsler’s View of Intelligence
"The global capacity of a person to act purposefully, to think rationally, and to deal effectively with his/her environment.“
Wechsler, David (1939). The measurement of adult intelligence.
Baltimore: Williams & Wilkins, p. 229.
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WAIS: A Historical Perspective
Wechsler-Bellevue 1939
Wechsler-Bellevue II 1946
WAIS 1955
WAIS-R 1981
WAIS-III 1997
WAIS-IV 2008
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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
– Enhance Measure of Working Memory• Revise Arithmetic and Digit Span to emphasize WM
– Enhance Measure of Processing Speed• Develop additional PS subtest: Cancellation
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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 of validity
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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
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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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Working Memory Scale
Core Subtests Digit Span Arithmetic
Supplemental Subtests Letter-Number Sequencing (16-69 only)
Verbal Comprehension Scale
Core Subtests Similarities Vocabulary Information
Supplemental SubtestsComprehension
Processing Speed Scale
Core Subtests Symbol Search Coding
Supplemental Subtests Cancellation (16-69 only)
Perceptual Reasoning Scale
Core Subtests Block Design Matrix Reasoning Visual Puzzles
Supplemental Subtests Picture Completion Figure Weights (16-69) only
FSIQ
Ages 16:0 –
90:11
New!
New!
New!
Test Structure
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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
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Changes to Verbal Subtests
• Similarities– Replaced items, Revised scoring rules, Added sample
responses• Vocabulary
– Replaced items, Revised scoring rules, Added sample responses, Added picture items
• Information– Replaced items, Revised scoring rules, Added sample
responses• Comprehension
– Replaced items, Revised scoring rules, Added sample responses
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Changes to Performance Subtests
• Block Design – Used Model and Stimulus Book for all teaching items,
Added 4-block diamond items before 9-block items, Reduced # of items with time bonus, Added BDN process score
• Matrix Reasoning– Retained 2 of 4 item-types, Added sample item for
each type, Clarified 30-second guideline• Picture Completion
– Enlarged visual stimuli and Added ceiling items
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Changes to Working Memory Subtests
• Digit Span– Added new sequencing task, Eliminated rhyming
numbers • Arithmetic
– Omitted reference to English measurement system and currency, Decreased emphasis on mathematical skills to increase emphasis on working memory
• Letter-Number Sequencing– Eliminated rhyming numbers and letters, Omitted
use of L, I, O, and zero, Implemented graduated teaching strategy
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Changes to Processing Speed Subtests
• Symbol Search– Enlarged symbols, Revised format and instructions
• Coding– Enlarged symbols and writing space, Redesigned for
more equivalent item difficulty across task, Revised instructions for consistency with WISC-IV
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Reduced Discontinue Rules
Subtest WAIS-III WAIS-IV
BD 3 2
SI, MR, AR, CO 4 3
VC, IN 6 3
PCm 5 4
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New Subtests: Visual Puzzles
“Which 3 of these pieces go together to make this puzzle?”
1 2
4
3
5 6
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New Subtests: Figure Weights
“Which one of these goes here to balance the scale?”
1 3 52 4
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New Subtests: Cancellation
“When I say go, draw a line through each red square and yellow triangle.”
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Composite Scores
• FSIQ • Based on 10 core subtests
• Index Scores: Primary interpretation level• VCI & PRI: 3 core subtests each• WMI & PSI: 2 core subtests each
• GAI = VCI + PRI• Optional Index score
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Process Scores
• Block Design– Block Design No Time Bonus (BDN)
• Digit Span– Digit Span Forward (DSF), Digit Span Backward (DSB), Digit Span
Sequencing (DSS)– Longest Digit Span Forward (LDSF), Longest Digit Span
Backward (LDSB), Longest Digit Span Sequence (LDSS)
• Letter-Number Sequencing– Longest Letter-Number Sequence (LLNS)
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Normative Sample Information
Validity Study Information
Clinical Study Information
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WAIS-IV Normative Sample
• Ages 16-90• Normative sample: N = 2200
– 200 examinees per age band for ages 16-69– 100 examinees per age band for ages 70-90
• National sample stratified by:– Sex– Education Level – Ethnicity – Region
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WAIS-IV Validity Studies
• WMS-IV Co-norming Study (2009 pub)• WMS-III Correlational Study (16:0-89:11)• WAIS-III Equating Study (16:0-89:11)• WISC-IV Equating Study (16:0-16:11)• WIAT-II Linking Study (16:0-19:11)• CMS Correlational Study (16:0-16:11)
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WAIS-IV Clinical Studies
• Intellectual Disability: Mild Severity• Intellectual Disability: Moderate Severity• Borderline Intellectual Functioning• Gifted Intellectual Functioning• Autistic Disorder• Asperger’s Disorder• Learning Disability: Reading• Learning Disability: Math• ADHD• TBI• Mild Cognitive Impairment• Dementia of the Alzheimer’s Type• Depression