Psychology (9/22)

Twin Types and Genetics

  • Identical twins share the same egg; fraternal twins arise from separate eggs.

  • Personality and traits are often more similar in identical twins due to shared genetics.

Influence of Genetics on Personality

  • Evidence suggests biological factors heavily influence personality traits like introversion/extroversion.

  • Adoption studies indicate that biological siblings show more similarities than adopted siblings.

Adoption and Its Effects

  • Adopted children can still form secure attachments and may grow up more altruistic.

  • Intelligence differences noted between adopted and biological children should be interpreted cautiously.

Temperament and Personality

  • Temperament refers to a person's characteristic emotional reactivity.

  • It is linked to physiological patterns and may have genetic influences.

Epigenetics

  • Epigenetics studies how environmental factors influence gene expression.

  • Traits like depression and intelligence involve complex interactions between genes and environment.

  • Heritability estimates: 30% for depression, 60% for intelligence.

Understanding Evolutionary Psychology

  • Studying how behavior and mind change under natural selection principles.

  • Emphasizes human similarities over differences and the role of the environment in shaping traits.

Natural Selection Principles

  1. Organisms compete for survival.

  2. Variations can increase or decrease survival chances.

  3. Survivors pass advantageous traits to offspring.

Human Genetic Diversity

  • Genetic diversity within racial groups often exceeds between-group diversity.

  • Shared genetic heritage is a unifying factor among all humans.

Universal Moral Standards

  • Common ethical views, such as treating others well, are seen across cultures.

  • Fear of harmful creatures (e.g., snakes, spiders) is rooted in evolutionary survival instincts.

Gender Differences in Reproductive Behavior

  • Men often show more interest in sex compared to women, rooted in evolutionary pressures to reproduce.

  • Cultural factors and social scripts influence observed behaviors across genders.

Parenting Styles

  • Types of parenting: 1) Permissive; 2) Authoritarian; 3) Authoritative (ideal balance).

  • Children's upbringing affects lifelong traits and values, especially through peer influence.