PSYC1001 Flashcards
Western lay person theories
Practical problem solving
• Verbal abilities
• Social competence
• Overall quite a holistic view of intelligence
What is deemed ‘intelligent’ changes with age
- age of person asked
- age of person asked about
intelligence
“the ability to learn from experience, solve problems, and use knowledge to adapt to new situations”
“The capacity for goal-directed adaptive behaviour
characteristics of intelligence
- abstract thinking or reasoning abilities
- problem-solving abilities
- capacity to acquire knowledge
Binet and Simon (1904)
- developed age-graded intellectual tasks
- mental age compared to chronological age
not IQ
Henry Goddard (1910)
- brought test to US
- identify mentally retarded children
- intelligence is fixed
Stanford-Binet Intelligence Scale
- Lewis Terman
IQ = Mental Age/Chronological Age x 100 - 100 signifies normal intelligence
Stanford-Binet Intelligence Scale measures…
- fluid reasoning
- knowledge
- quantitative reasoning
- visual-spatial processing
- working memory
calculating IQ today
- total score is compared to scores of age mates
- IQ 100= average score at each age level
David Wechsler Intelligence
“The global capacity of a person to act purposefully, to think rationally, and to deal effectively with his/her environment”
Wechsler improved on tests in 3 ways
- comprehensive: both verbal & nonverbal
- less emphasis on culture knowledge
- more specific: subtests for abilities scored separately
Wechsler Adult Intelligence Scale (WAIS-IV)
- 15 subtests
- progressively harder
- overall IQ score and 4 index scores
Index scores (WAIS-IV)
- Verbal Comprehension Index (VCI)
- Perceptual Reasoning Index (PRI)
- Working Memory Index (WMI)
- Processing Speed Index (PSI)
Aptitude measures
- Assess potential to learn or perform well in the future
* SAT, ACT, GRE verbal and quantitative tests
Achievement measures
Test specific learning or accomplishments
• GRE subject area tests
• Classroom tests
Culturally fair?
WAIS and WISC rely on the individual having detailed knowledge about mainstream culture in order to perform well, particularly in tasks like information, vocabulary, and other verbal tests
Don’t provide a fair test of abilities for people unfamiliar with the dominant culture
Culture fair tests use items that are applicable across all cultures
May not be language-based
Raven’s Progressive Matrices
Provides a measure of ‘g’ • 60 multiple choice items measuring abstract reasoning Provides overall score only • No subtests • Very different to WAIS IQ
Raven’s Progressive Matrices
Culturally fair?
- No questions require specific factual information
- No questions require knowledge of a specific culture
- Still a western view of logical reasoning
what is a test?
• A systematic procedure •Observe behaviour in a standard
situation
•Describe behaviour with scores or categories
• Advantages of tests:
•Standardised for objectivity •Calculation of norms for comparison
Reliability
repeatable/stable
- test re test
- alternate form
validity
measure what its meant to
Content validity
Criterion validity
Construct validity
Evaluating value of IQ tests
- Statistical Reliability
- Not good before age 7
- Consistent for teens and adults
- Statistical Validity
- Predicts success in school
- Predicts success in life situations and jobs
- Not a perfect measure of “smartness”
- Only measures some abilities
- Variability of individuals’ emotional responses
- Individuals’ motivational differences •Cultural differences
- Not a measure of ‘natural’ ability
- Differing educational and social experiences
factors influencing measurement of cognitive abilities
Emotional arousal can influence scores on cognitive ability tests
Test anxiety
Physiological factors (hunger, fatigue, etc.) Motivation
Self-fulfilling prophecy
Nature vs nurture
Influenced partly by genetics (heritability) Not clear exactly which genes are involved
Intelligence is developed ability
Influenced partly by environment – education, culture & other life experiences
Enriched early environment critical
Can’t easily separate nature/nurture
adoption studies
Many studies of IQ examine siblings who have been adopted by the same or different families
Adoption surprise: Children whose biological parents were wealthy had higher IQs than children whose biological parents were poor, regardless of the socio- economic status (SES) of the adoptive family
12-15 point rise in IQ levels among children from poor SES backgrounds adopted by parents who provided academically enriched environments
But children’s IQ still more correlated with genetic than adoptive parents
Duyme et al 1999
65 deprived children, defined as abused and/or neglected during infancy, were selected
Adopted between 4 and 6 years of age, and they had an IQ <86 (mean = 77, SD = 6.3) before adoption
Average IQs of adopted children in lower and higher socioeconomic status (SES) families were 85 (SD = 17) and 98 (SD = 14.6), respectively, at adolescence (mean age = 13.5 years)
A significant gain in IQ dependent on the SES of the adoptive families (mean = 7.7 and mean = 19.5 IQ points in low and high SES, respectively),
SES & IQ
Parents’ intelligence influences occupation & status
Genetics
Income affects the family environment (books etc)
Motivational differences
High SES value education more
More opportunities for people with higher IQs
Ethnicity & IQ
Differences (variance) within ethnic groups is greater than between ethnic groups
Significant environmental differences & many cultural factors
raising iq
Lower IQ has been linked to poverty, malnutrition, exposure to lead or alcohol, low birth weight & complications during birth
IQ can be raised by early intervention to enrich the child’s environment
Project Head Start - a program of the USA’s Department of health & Human Services that assists children from low- income families – health, nutrition, parent involvement services
Kaler & Freeman 1994
Study of cognitive & social development of a group of 25 children (23-50 mths) in Romanian orphanage
Available Apgar scores (assess newborn health) suggest children were all normal when born & birth weights all within normal range
Assessed orphans & non-orphans on range of cognitive & IQ measures
Romanian orphans with minimal human interaction showed severely delayed development
Particularly in areas of interaction, requesting, play, indicating, self-recognition & social reference
Charles Spearman - 2 factor theory
An individual’s performance at one type of cognitive task tends to be positively correlated to their performance at other kinds of cognitive task – e.g. school subjects
Spearman suggested that all mental performance could be conceptualised in terms of a single general ability factor, which he labelled the g-factor (or g)
Accounts for 40-50% of variance on IQ tests & a person’s IQ test is seen to be indicative of their g-factor status
Some evidence from PET studies
Louis Thurstone
Psychometric approach suggesting 7 primary mental abilities – no g-factor
- Numerical
- Reasoning
- Verbal fluency
- Spatial visualisation
- Perceptual ability
- Memory
- Verbal comprehension
Raymond Cattell
Distinguished between 2 types of general intelligence Fluid intelligence (Gf)– the capacity to think logically and solve problems in novel situations Crystallized intelligence (Gc) – the ability to use skills, knowledge and experience
Information Processing Model
The amount of information that can be processed The speed of the processing
Efficiency of processing
Working memory
Knowledge/long-term memory
intellectual disability
IQ below 70 (75 in some cases) along with
significant difficulty in adaptive functioning
causes of intellectual disability
Severe or profound – almost always biological (genetic or affected by environment)
Genetic causes - Downs Syndrome, Fragile X Syndrome
Environmental – Rubella, Foetal alcohol syndrome,
infections
learning disability
Indicated by significant discrepancies between measured intelligence and academic performance
types of learning disability
dyslexia
dysphasia
dysgraphia
dyscalculia
dyslexia
difficulty understanding the meaning of what is read & in sounding out and identifying written words
dysphasia
difficulty understanding spoken words & recalling the words needed for effective speech
dysgraphia
problems with writing, inability to form letters & omission or reordering of words and parts of words
dyscalculia
difficulty understanding quantity & difficulty comprehending basic arithmetic principles and operations