2. What’s it all about?
Nature = Behaviours, motivation, emotions, etc, that are essentially biological and that we were born with (inherited).
Nurture = Behaviours, etc, that are essentially learnt and therefore were not born with. (This learning is known as early socialisation.)

3. Imprinting
Baby ducks will follow the first thing see after they are born
Thinking it is their mother.

4. DNA Most human beings have 23 pairs of chromosomes so 46 in total.
23rd chromosome determines sex
Chromosome contain our DNA which determines all of our characteristics.

5. What does DNA determine about us?
To a degree: Everything.
Down Syndrome babies have 47 chromosomes. An extra 21st chromosome
Most individuals who have Down syndrome have intelligence quotient (IQ) scores in the mild to moderate range of retardation. Children with Down syndrome need to be in special educational programs that give them a good environment for learning and that keep pace with their intellectual capabilities.

6. Nature vs. Nurture in IQ
Are differences between people due to environmental or genetic differences?
Misunderstanding the question
“Is a person’s intelligence due more to genes or to environment?”
no genes = no intelligence
both genes & intelligence crucial for any trait
Clearly, IQ is not the only psychological construct for which this debate applies, and instructors may wish to take a moment to name the other areas (i.e., personality, mental disorders, etc.) for which heritability is hotly debated.

7. Study Techniques Twin Research
Identical versus fraternal twins (monozygotic versus dizygotic)
Shared environmental experiences
Common experiences, e.g. parent’s personality, intelligence, SES status, neighborhood live in, parenting techniques
Nonshared environmental experiences
Child’s own experiences within and outside the family that are not shared with siblings

8. Twins

9. Genetic Influences
Similarity of
intelligence
scores
(correlation)
Identical
twins
reared
together
apart
Fraternal
Siblings
Unrelated
individuals
The most genetically similar people have the most similar scores

10. Family Influence on IQ
Transient influence of family in which you are raised
adoptive siblings as children and adults
identical vs. fraternal twins reared together
Fraternal twins
Identical twins
figure scanned in from Gray's text, pg. 370, figure 10.7

11. IQ Differences among Racial/Cultural Groups
Find differences among racial & cultural groups on IQ
American Blacks score about 15 points lower than Whites
WHY?
genetics?
Witty & Jenkins (1935)
No support for genetic differences
environment?
Gray discusses the Witty & Jenkins study of high-IQ Black children in Chicago on page it makes a good discussion topic

12. The study of Feral Children
Wild children who have been separated from society.
The Case of Genie.
Other cases.

13. Temperament & Personality
Temperament: a set of tendencies to respond in predictable ways.
Buss & Plomin (1984) found .50 to .60 average correlations between temperatment scores of identical twins. The correlations for fraternal twins are about 0.

14. Raised apart, yet both grow up the same

15. Psychological Disorders
Schizophrenia: disturbances in logical thinking, emotional expression, social behavior.
Originally: thought due to a cold and inconsistent mother.
Now: concordance rates for identical twins: 48%; fraternal twins 17%.
1% of the general population has Schizophrenia.

16. Stages of Cognitive Development
Sensorimotor stage (Infancy). In this period (which has 6 stages), intelligence is demonstrated through motor activity without the use of symbols. Knowledge of the world is limited (but developing) because its based on physical interactions / experiences. Children acquire object permanence at about 7 months of age (memory). Physical development (mobility) allows the child to begin developing new intellectual abilities. Some symbollic (language) abilities are developed at the end of this stage.
Pre-operational stage (Toddler and Early Childhood). In this period (which has two substages), intelligence is demonstrated through the use of symbols, language use matures, and memory and imagination are developed, but thinking is done in a nonlogical, nonreversable manner. Egocentric thinking predominates
Concrete operational stage (Elementary and early adolescence). In this stage (characterized by 7 types of conservation: number, length, liquid, mass, weight, area, volume), intelligence is demonstarted through logical and systematic manipulation of symbols related to concrete objects. Operational thinking develops (mental actions that are reversible). Egocentric thought diminishes.
Formal operational stage (Adolescence and adulthood). In this stage, intelligence is demonstrated through the logical use of symbols related to abstract concepts. Early in the period there is a return to egocentric thought. Only 35% of high school graduates in industrialized countries obtain formal operations; many people do not think formally during adulthood.