RATIONALE for IQ TEST

Transcription

1 W I WECHSLER INTELLIGENCE SCALE for CHILDREN FOURTH EDITION

2 RATIONALE for IQ TEST Identify learning problems Determine potential/performance discrepancy Determine eligibility and need for educational therapy

3 What Does IQ Measure? Estimate of mental ability Prediction of school achievement Strengths & weaknesses in perception & cognition

4 WECHSLER INTELLIGENCE SCALE for CHILDREN (WISC IV) Ages 6-16 years Administered by licensed or certified school psychologist

5 WISC-IV MODEL Verbal Comprehension Similarities Vocabulary Comprehension If Information Word Reasoning Perceptual Reasoning Block Design Picture Concepts Matrix Reasoning Picture Completion Working Memory FSIQ Processing Speed Digit Span Letter-Number Sequencing Arithmetic Coding Symbol Search Cancellation

6 FULL SCALE IQ Composite of 10 core subtests Score based on 30% each VCI & PRI 20% each PS & WM Often reported as a range as well as one specific number Usually best predictor of classroom performance Compares to standard scores of achievement tests

7 QUALITATIVE DESCRIPTIONS of IQ SCORES IQ RANGE CLASSIFICATION PERCENT 130 and above Gifted Superior High Average Average Low Average Borderline and below Extremely Low 2.2

8 INDEX SCORES Four separate subscales Helpful in confirming deficits Standard scores comparable to each other

9 VERBAL COMPREHENSION INDEX Measures: Verbal knowledge Understanding & application of verbal skills to new situations Core Subtests Similarities, Vocabulary, Comprehension Supplemental Subtests Information, Word Reasoning

10 VERBAL COMPREHENSION INDEX CORE SUBTESTS SIMILARITIES Verbal reasoning Associative thinking Categorization ti VOCABULARY Language development Word knowledge Verbal expression Long-term memory

11 VERBAL COMPREHENSION INDEX CORE SUBTESTS COMPREHENSION Verbal reasoning & conceptualization Ability to evaluate & utilize past experience Verbal comprehension & expression Ability to demonstrate practical social judgment

12 VERBAL COMPREHENSION INDEX SUPPLEMENTAL SUBTESTS INFORMATION General factual knowledge Long-term memory Verbal expression WORD REASONING Verbal deductive reasoning

13 PERCEPTUAL REASONING Measures: INDEX Visual problem solving Ability to interpret & organize visually perceived material Core Subtests: Block Design, Picture Concepts, Matrix Reasoning Supplemental l Subtests t Picture Completion

14 PERCEPTUAL REASONING INDEX CORE SUBTESTS BLOCK DESIGN Analyze & synthesize abstract visual stimuli Nonverbal concept formation PICTURE CONCEPTS Abstract, categorical reasoning ability

15 PICTURE CONCEPTS

16 PERCEPTUAL REASONING INDEX CORE SUBTESTS MATRIX REASONING Fluid intelligence Reliable estimate of general intellectual ability

17 MATRIX REASONING

18 PERCEPTUAL REASONING INDEX SUPPLEMENTAL SUBTEST PICTURE COMPLETION Visual perception & organization Concentration Visual recognition of essential details of objects

19 WORKING MEMORY INDEX Measures: Ability to attend or concentrate Short-term auditory memory Core Subtests: Digit Span, Letter-Number Sequencing Supplemental l Subtest t Arithmetic

20 WORKING MEMORY INDEX CORE SUBTESTS DIGIT-SPAN Auditory short- term memory Sequencing skills Attentionti Concentration LETTER-NUMBER SEQUENCING Sequencing Mental manipulation Auditory shortterm memory

21 WORKING MEMORY INDEX SUPPLEMENTAL SUBTEST ARITHMETIC Mental manipulation Attention and concentration Numerical reasoning ability Short and long-term memory

22 PROCESSING SPEED INDEX Measures: Psychomotor speed Short-term term visual memory Visual scanning accuracy Core Subtests Coding and Symbol Search Supplemental l Subtest Cancellation

23 PROCESSING SPEED INDEX CORE SUBTESTS CODING Short-term term visual memory Visual-motor coordination Attention and concentration SYMBOL SEARCH Short-term term visual memory Visual-motor coordination Visual discrimination Concentration

24 PROCESSING SPEED INDEX SUPPLEMENTAL SUBTEST CANCELLATION Measure of processing speed

25 WISC-IV SCORE ANALYSIS

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27 WISC-IV SCORE ANALYSIS 1. Record the FSIQ Score 2. Determine classification of FSIQ 3. Record Index Scores 4. Determine classification of Index Scores 5. Record average, above & below average abilities indicated in the psychologist s report 6. Graph the results

28 1. Determine Classification of FSIQ 102 Average

29 Summary of WISC-IV Results (Marshall) Ability = Propensity for Learning FSIQ Index Scores 102 Average Classification: 100 Average VC PR 112 High Average WM 110 High Average PS 75 Borderline

30 Index Analysis: High Average Average Low Average or Superior or Borderline Verbal reasoning Expressive Vocab Verbal knowledge Word Reasoning Social judgment VC PR Categorize or Spatial-perceptual group similar ability objects. Fluid reasoning Short-term auditory sequential memory Visual alertness to detail WM PS Visual scanning Short-term visual memory Visual tracking Quickly matching similar objects

31 WISC-IV Graph Name: Marshall Collins Date: August 12, 2003 Grade: 3.0 Age: 9-2 FSIQ: 102 VCI: 100 PRI: 112 WMI: 110 PSI: 75 Verbal Comprehension Perceptual Reasoning Working Memory Processing Speed SI VC CO (IN) (WR) BD PCn MR PCm DS LN (AR) CD SS (CA)

32 WISC-IV