Intelligence test used in the forensic psychology. There are different tests are used to measure the intelligence or IQ of a person. Such as, Ravens Progressive Matrices Bhatia Battery of Intelligence Culture Fair test Wechsler scale Alexander Pass a long test etc.

2. Intelligence Tests
Palash A. Mehar
B.Sc. IInd Year
Govt. Institute of Forensic Science, Nagpur.

3. IntelligenceIntelligence
• Definitions:-Definitions:-
• Intelligence is the aggregate or
global capacity of the individual to
think rationally, to act purposefully
and to deal effectively with the
enviornment.
(Wechsler-1944)(Wechsler-1944)
• Intelligence is the ability to master
the information and skills needed to
succeed within a particular culture.
(Lolurto-1991)

4. Assessment of intelligence andAssessment of intelligence and
concept of I.Q.concept of I.Q.
• Various tests to assess intelligence.
• Binet, Stern, Wechsler-pioneer in intelligence testing.
• It flourished especially at the time of world war.
• The concept of Mental Age(M.A.) is developed by Alfred
Binet.
• William Stern_Intelligence quotient(I.Q.)
• I.Q.=(M.A./C.A.) ×100

5. Types of IntelligenceTypes of Intelligence
• Intelligence can be divided into three kinds,Intelligence can be divided into three kinds,
1.1. Concrete intelligenceConcrete intelligence
2.2. Social intelligenceSocial intelligence
3.3. Abstract intelligenceAbstract intelligence

6. Types of Intelligence TestsTypes of Intelligence Tests
• Based on number of individuals to be tested,
1) Individual tests:- One individual is tested at a time.
2) Group tests:- Group of individual tested at a time.
• Based on the form of test,
1) Verbal tests:- Uses language or paper and pencil
2) Non-verbal test:- For example, Performance test- These test
involves such activities in which use if language is not necessary.

7. Examples of Intelligence TestsExamples of Intelligence Tests
• The Wechsler intelligence scales
• Malin’s intelligence scale
• The Stanford-Binet Intelligence scale
• Raven’s progressive matrices
• Cattell’s Culture fair intelligence tests
• Alexander Pass a long test
• Koh’s block design test
• Bhatia battery of intelligence

8. Stanford-Binet Intelligence ScaleStanford-Binet Intelligence Scale

9. Stanford-Binet Intelligence ScaleStanford-Binet Intelligence Scale
• History:-History:-
• Stanford Binet Test (1965) intelligent this is a new
version of Binet-Simen test.
• In the 1905 two French Psychologist Binet and Simen
discover this intelligence test.
• After that it was modified American Psychologist
Termon with Binet at Stanford University for current
use of intelligence assessment.
• In 1986 it is known as Stanford Binet intellignce test
form.

10. Stanford-Binet Intelligence ScaleStanford-Binet Intelligence Scale
• Indian adaptation:- Binet-Kamat test.
• Age group :- 2 -23 years
• Total time:- 30 to 90 minutes
• The Stanford-Binet measures five factors of cognitive
ability:-
1. Fluid Reasoning,
2. Knowledge,
3. Quantitative Reasoning,
4. Visual-Spatial Processing, and
5. Working Memory.

11. Stanford-Binet Intelligence ScaleStanford-Binet Intelligence Scale
IQ Range ("deviation IQ") IQ Classification
145–160 Very gifted or highly advanced
130–144 Gifted or very advanced
120–129 Superior
110–119 High average
90–109 Average
80–89 Low average
70–79 Borderline impaired or delayed
55–69 Mildly impaired or delayed
40–54 Moderately impaired or delayed

12. The Wechsler ScaleThe Wechsler Scale

13. The Wechsler ScaleThe Wechsler Scale
• Original : David Wechsler(1939)David Wechsler(1939)
• Three scales:
1. WAIS : Adults, 16-74 years (1939)
2. WISC : Children 7-16 years (1955)
3. WPPSI : Preschool primary 4-61/2yrs
• Indian adaptation : Dr. Arthur Malin.

14. The Wechsler ScaleThe Wechsler Scale
Verbal ScaleVerbal Scale
Information
Comprehension
Arithmetic
Similarities
Digit Span
Vocabulary
Word reasoning
Verbal ScaleVerbal Scale
Information
Comprehension
Arithmetic
Similarities
Digit Span
Vocabulary
Word reasoning
Performance ScalePerformance Scale
Digit symbol
Picture completion
Block Design
Picture arrangement
Object assembly
Matrix reasoning
Mazes
Performance ScalePerformance Scale
Digit symbol
Picture completion
Block Design
Picture arrangement
Object assembly
Matrix reasoning
Mazes

15. The Wechsler ScaleThe Wechsler Scale
Psychometric propertiesPsychometric properties
• Norms : Full scale IQ, index score, subsets scaled
scores.
• Reliability : Split half reliability : .90 to .98
• Validity : Correlation with Stanford Binet -.80, with
RPM-.70.

16. Cattell’s Culture fair IntelligenceCattell’s Culture fair Intelligence
TestTest
• Raymond B. Cattell created the CFIT to avoid enviornmental and
genetic factors. Cattell argued that general intelligence(g) exist
and that it consist of fluid and crystalized intelligence.
• Crystalized intelligence refers to the aspect of cognition in which
initial intelligent judgements have become crystalized as habits.
Fluid intelligence is in several ways more fundamental and shows
in tests requiring responses to entirely new situations.
• This nonverbal intelligence test is culture fair because it avoids
cultural and language biases and focuses on logical reasoning
only. The test is based on the highly scientifically validated
progressive matrices test of Dr. John Raven.

17. Cattell’s Culture fair IntelligenceCattell’s Culture fair Intelligence
TestTest
• Group as well as individual.
• Time depends on scale.
• 3scale.
Scale 1 For 4-8 yrs Children
& older retardates.
Scale2 For 8-14 yrs children
& average adults.
Scale3 For genius people.

18. Cattell’s Culture fair IntelligenceCattell’s Culture fair Intelligence
TestTest
Psychometric propertiesPsychometric properties
• I.Q. & Percentile norms are given.
• Standardization varies according to age level.
• Reliabilities in .70’s. Validity correlations are in the range of .
56-.85.
• Normative data from western European countries, in U.S. &
Australia are comparable.

19. Raven’s Progressive MatricesRaven’s Progressive Matrices

20. Raven’s Progressive MatricesRaven’s Progressive Matrices
• Developed by J. C. Raven in 1936.
• Was designed as a measure of
spearman’s ‘g’ factor of general
intelligence.
• It’s a multiple choice intelligence
test of abstract reasoning.
• Subject has to identify the missing
pattern.

21. Raven’s Progressive MatricesRaven’s Progressive Matrices
Versions of RPMVersions of RPM
• There are three versions,
Name of version Age group Total items Time required
Standard
Progressive
Matrices
12 yrs & above 60 items in 5
sets of 12
60 minutes
Coloured
Progressive
Matrices
Below 11yrs. 36 items in 3
sets of 12
15-30 minutes
Advanced
Progressive
Matrices
High
intelligence
12 practice
items
36 test items
40-60 minutes

22. Raven’s Progressive MatricesRaven’s Progressive Matrices
Psychometric propertiesPsychometric properties
• Test-retest reliability : .70-.90
• Internal consistency validity : .80-.90
• Autism spectrum disorder patients perform higher as
they are predisposed towards visual reasoning.

23. Bhatia Battery using intelligenceBhatia Battery using intelligence
testingtesting
• C.M.BhatiaC.M.Bhatia Constructed this test for indian
population in 1955.
• It has 5 subsets :
1)Koh’s block design test
2)Alexander pass a long test
3)Pattern drawing test
4)Immediate memory
5) Picture construction

24. Bhatia Battery using intelligenceBhatia Battery using intelligence
testingtesting

25. Bhatia Battery using intelligenceBhatia Battery using intelligence
testingtesting
• Total maximum time 1 hr.
• Total maximum score 95.
• Standardization of 5 subsets was done for over 4yrs in
villages & cities in places of cross cultural settings.
• Split-half reliability : .55
• Validity :- .77
• Correlation with other intelligence test is .67-.82

26. • These are just few examples.These are just few examples.
• There are many other intelligence tests.There are many other intelligence tests.
• Test should be chosen according to the situation,Test should be chosen according to the situation,
client’s suitability n needs of the client.client’s suitability n needs of the client.