OCR Child Psychology Key Studies

What significant correlation did Van Leeuwen find in terms of spousal IQ?

• There was no significant correlation

• A significant and moderately high spousal correlation of 0.33

• A spousal correlation of 0.10

• Spouses had IQ scores that were unrelated

What did Van Leeuwen's study conclude about cultural transmission and IQ?

• Cultural transmission significantly influences children's IQ

• Cultural transmission does not significantly influence children's IQ

• Cultural transmission only influences adult IQ

• Cultural transmission influences IQ equally in adults and children

From which registry were the twins in Van Leeuwen's study recruited?

• The Netherlands Baby Registry

• The European Twin Registry

• The Netherlands Twin Registry

• The International Twin Registry

In Van Leeuwen's study, What was one key finding about the environment and IQ?

• The environment influences high IQ groups more than low IQ groups

• The environment influences low IQ groups more than high IQ groups

• The environment has equal influence on all IQ groups

• The environment does not influence any IQ groups

Which families were excluded from Van Leeuwen's study?

• Families with children with pacemakers and metal materials in the head

• Families with children with psychiatric problems

• Families with children in special education

• All of the above

What does Van Leeuwen's research suggest about the variance in twins compared to siblings?

• The variance in twins was significantly larger than in siblings

• The variance in siblings was significantly larger than in twins

• The variance in twins and siblings was roughly equal

• Twins showed no variance

How many families agreed to participate in Van Leeuwen's study after being invited?

• 150 families

• 214 families

• 75 families

• 112 families

How much of intelligence is explained by genetics according to Van Leeuwen?

• 67%

• 33%

• 50%

• 75%

Which test was used to measure intelligence in the parents in Van Leeuwen's study?

• The Wechsler Adult Intelligence Scale

• The Stanford-Binet Intelligence Scales

• The Raven Advanced Progressive Matrices

• The Raven Standard Progressive Matrices

What was the main tool used to measure intelligence in children in Van Leeuwen's study?

• The Raven Advanced Progressive Matrices

• The Wechsler Intelligence Scale for Children

• The Raven Standard Progressive Matrices