Biologic Theory of Personality

Overview

• The biologic theory of personality suggests that important components of personality are inherited or determined by our genes.
• Variations:
  • Some approaches relate specifically to the brain.
  • The evolutionary psychology approach focuses on behavior rather than traits, theorizing different mating strategies for males and females.
  • Example: Men have multiple sexual partners; women are selective due to pregnancy costs.

Key Concepts

• Inheritance of Personality:

  • Important components of personality are inherited.
  • Genes play a significant role in determining personality traits.
  • Studies often use twins to differentiate between genetic and environmental impacts.

• Twin Studies:

  • Focus on identical twins due to identical genetic makeup.
  • Studies on twins raised apart show similar personalities, indicating a genetic influence.
  • Traits influenced by heredity:
    • Social Potency: Leadership and mastery roles in social situations.
    • Traditionalism: Tendency to follow authority.

• Traits with Weaker Genetic Components:

  • Achievement and closeness may vary due to environmental factors.

Genetic Influence on Specific Traits

• Example: Dopamine-4 receptor gene
  • Longer gene associated with thrill-seeking behaviors (e.g., liking roller coasters, skydiving).
  • Presence of a gene does not guarantee a specific personality trait; environment also plays a role.

Temperament

• Definition: Innate disposition, potentially inherited (linked to genetics).
• Includes mood and activity level, often consistent through life.
• Linked to various theories, not just biologic (e.g., trait theory).

Summary

• Inherited genes influence traits, leading to behaviors and personality.
• Personality is not solely determined by genes; environmental factors also contribute.
• Understanding the interplay of genetic and environmental factors is crucial in comprehending personality development.