WECHSLER INTELLIGENCE

SCALE for CHILDREN-FOURTH EDITION

Week 3

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What Does IQ Measure?

. Estimate of mental ability

. Prediction of schoolachievement

. Prediction of life outcomes thatare related to cognitive skills

. Strengths & weaknesses inperception &cognition

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Cattell-Harne-Carroll Theory(CHC) of Cognitive Ability

. Most comprehensive and empiricallysupported framework forunderstanding human cognitiveabilities

. Provides a "map" of all knowncognitive abilities

. Gf-Gc Theory

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CHC Broad Abilities

. Fluid intelligence (Gt)

. Crystallized intelligence (Gc). Short-tenn memory (Gsm)

. Long-tenn retrieval (GIt'J

. Processing speed (Gs)

. Visual-spatial thinking (Gv)

. Auditory processing (Ga)

. Quantitative ability (Gq)

. Reading-writing ability (Grw)CNILDLndn GuIde,,,,,.Z008 ~.

RATIONALE for IQ TEST

. Identify learning problems

. Detennine potential/perfonnancediscrepancy

. Detennine need for educational

therapy intervention

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It is not just what students know, buthow we can create future learning.

Propensity is a power or force whichpropels an individual into higher

levels of functioning. It involves awillingness to be modified.

Propensity may exist in differentindividuals at different stages.

Reuven Feuerstein

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We are not attempting to raise astudent's IQ, rather we are

raising his propensity in orderfor him to function more

effectively.

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WECHSLER INTELLIGENCESCALE for CHILDREN

(WiSe - IV)

. Ages 6-16 years

. Administered by licensedor certified schoolpsychologist

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WISC-IV MODELVerbalComprehension Perceptual Reasoning

( Similarities BlockDesignVocabulary p'ctu C ceptsComprehension I re on .I for:ation MatrixReasoning

w~R'Zasonin PictureCompletion

~ FSIQr::PWorkingMemory<J ~ Processing Speed

DigitSpanLetter.Number Sequencing

Arithmetic

CodingSymbolSearch

Cancellation41

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 onespecific number. Usually best predictor of classroomperformance. Compares to standard scores ofachievement tests

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QUALITATIVE DESCRIPTIONS of IQ SCORES

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INDEX SCORES

. Four separate subscales

. Helpful in confirming deficits

. Standard scores comparable to eachother

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IQRANGE CLASSIFICATION PERCENT

130 and above Gifted 2.2

120-129 Superior 6.7

110-119 HighAverage 16.1

90- 109 Average 50.0

80-89 LowAverage 16.1

70-79 Borderiine 6.7

69 and below Extremely Low 2.2

VERBAL COMPREHENSIONINDEX

. Measures:-Verbal knowledge- Understanding &application of verbal

skills to new situations.Core Subtests-Similarities, Vocabulary,

Comprehension. Supplemental Subtests

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VERBAL COMPREHENSION INDEXCORE SUBTESTS

VOCABULARY

. Languagedevelopment

.Wordknowledge. Verbalexpression

. Long-termmemory

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SIMILARITIES. Verbal

reasoning. Associative

Ithinking. Categorization

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VERBAL COMPREHENSION INDEXCORE SUBTESTS

COMPREHENSION

. Verbal reasoning & conceptualization

. Ability to evaluate & utilize pastexperience

. Verbal comprehension & expression

. Ability to demonstrate practicalsocial judgment

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VERBAL COMPREHENSION INDEXSUPPLEMENTALSUBTESTS

INFORMA TION.General factual

knowledge

. Long-termmemory.Verbalexpression

WORDREASONING.Verbal deductivereasoning

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PERCEPTUAL REASONINGINDEX

. Measures:

- Visual problem solving- Ability to interpret & organize visually

perceived material. Core Subtests:- Block Design, Picture Concepts, Matrix

Reasoning. Supplemental Subtests

- Picture Completion

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PERCEPTUAL REASONING INDEXCORE SUBTESTS

BLOCK DESIGN

.Analyze &synthesizeabstract visualstimuli

. Nonverbal

conceptformation

PICTURECONCEPTS

.Abstract,categoricalreasoning ability

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PERCEPTUAL REASONING INDEXCORE SUBTESTS

MATRIXREASONING

. Fluid intelligence

. Reliable estimate of generalintellectual ability

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PERCEPTUAL REASONING INDEXSUPPLEMENTALSUBTEST

PICTURECOMPLETION

. Visual perception & organization. Concentration

. Visual recognition of essentialdetails of objects

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WORKING MEMORY INDEX

. Measures:- Ability to attend or concentrate- Short-tenn auditory memory.Core Subtests:- Digit Span, Letter-Number Sequencing

. Supplemental Subtest-Arithmetic

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WORKING MEMORY INDEXCORE SUBTESTS

DIGIT-SPAN

. Auditoryshort-term memory

. Sequencingskills.Attention.Concentration

LETTER-NUMBERSEQUENCING

. Sequencing. Mentalmanipulation.Auditoryshort-term memory

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WORKING MEMORY INDEXSUPPLEMENTALSUBTEST

ARITHMETIC

. Mental manipulation. Attention and concentration

. Numerical reasoning ability

. Short and long-term memory

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PROCESSING SPEED INDEX

.Measures:- Psychomotor speed- Short-term visual memory- Visual scanning accuracy. Core Subtests- Coding and Symbol Search

. Supplemental Subtest- Cancellation

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PROCESSING SPEED INDEXCORE SUBTESTS

CODING. Short-term visualmemory. Visual-motorcoordination. Attention andconcentration

SYMBOLSEARCH.Short-termvisualmemory. Visual-motorcoordination

. Visualdiscrimination. Concentration

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PROCESSING SPEED INDEXSUPPLEMENTALSUBTEST

CANCELLA TION

. Measure of processing speed

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WISC-IVSCOREANALYSIS

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WISC-IV SCORE ANALYSIS

1. Record the FSIQScore2. Detennine classification of FSIQ3. Record Index Scores4. Detennine classification of Index

Scores5. Record average, above & below

average abilities indicated in thepsychologist's report

6. Graph the resultsCNILD ,n_,',GuId, ~ 2008

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