WECHSLER INTELLIGENCE SCALE for CHILDREN- FOURTH EDITION Week 3 eNILDLndD"""""'GaIdo,=.2008 4). What Does IQ Measure? . Estimate of mental ability . Prediction of school achievement . Prediction of life outcomes that are related to cognitive skills . Strengths & weaknesses in perception &cognition e NlLDLndD"""""'~""" =. '008 4), Cattell-Harne-Carroll Theory (CHC) of Cognitive Ability . Most comprehensive and empirically supported framework for understanding human cognitive abilities . Provides a "map" of all known cognitive abilities . Gf-Gc Theory e NILDLnd D"""""". GuId, =. 2008 ~.
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WECHSLER INTELLIGENCE
SCALE for CHILDREN-FOURTH EDITION
Week 3
eNILDLndD"""""'GaIdo,=.2008 4).
What Does IQ Measure?
. Estimate of mental ability
. Prediction of schoolachievement
. Prediction of life outcomes thatare related to cognitive skills
. Strengths & weaknesses inperception &cognition
e NlLDLnd D"""""'~""" =. '0084),
Cattell-Harne-Carroll Theory(CHC) of Cognitive Ability
. Most comprehensive and empiricallysupported framework forunderstanding human cognitiveabilities
. Provides a "map" of all knowncognitive abilities
( 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
C>NlLDLnd n ' GuId~ ,... ~.
QUALITATIVE DESCRIPTIONS of IQ SCORES
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INDEX SCORES
. Four separate subscales
. Helpful in confirming deficits
. Standard scores comparable to eachother
C>NlLDLnd n_"Guid<, 20084!'
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
-Information, Word Reasoning"NlLDWdn-,',GuIde,....- 4f
VERBAL COMPREHENSION INDEXCORE SUBTESTS
VOCABULARY
. Languagedevelopment
.Wordknowledge. Verbalexpression
. Long-termmemory
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SIMILARITIES. Verbal
reasoning. Associative
Ithinking. Categorization
i(J
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