The biological approach to personality suggests that our personality is influenced by our genes, brain, nervous system, hormones, and evolution. While experiences and the environment shape who we become, biology also plays an important role in explaining why people differ in personality.
Key Learning Objectives
After studying this section, you should be able to:
- Explain the findings of the Minnesota Study of Twins Reared Apart.
- Describe the three infant temperaments identified by Thomas and Chess.
- Explain the evolutionary perspective on personality.
1. Genetics and Personality
Biological psychologists believe that personality is partly inherited.
Minnesota Study of Twins Reared Apart
Researchers studied 350 pairs of twins, including:
- Identical twins raised together
- Identical twins raised apart
- Fraternal twins
They discovered that identical twins raised apart often had remarkably similar personalities, suggesting that genetics has a strong influence on personality.
Heritability
Heritability is the proportion of differences among people that can be explained by genetics.
Traits showing relatively high heritability include:
- Leadership
- Resistance to stress
- Fearfulness
- Sense of well-being
- Obedience to authority
- Alienation
However, personality is not controlled by a single gene. Instead, many genes work together, and environmental influences affect how genes are expressed.
2. Temperament
Temperament refers to the natural emotional and behavioral style that appears very early in life.
Researchers Thomas and Chess (1977) identified three infant temperaments:
| Temperament | Characteristics |
|---|---|
| Easy | Calm, adaptable, regular routines, generally happy |
| Difficult | More intense emotions, irregular routines, harder to soothe |
| Slow-to-warm-up | Quiet, cautious, gradually adapts to new situations |
Although temperament has a biological basis, family interactions, experiences, and maturation influence how these traits develop over time.
3. Reactivity and Self-Regulation
Researchers suggest two important parts of temperament:
Reactivity
How strongly someone responds to new or challenging situations.
Examples:
- Becoming anxious quickly
- Remaining calm during unexpected events
Self-Regulation
The ability to control emotional reactions and behavior.
Examples:
- Staying calm when frustrated
- Managing anger or fear
Together, these characteristics influence adult personality.
4. Evolutionary Perspective
Evolutionary psychologists believe that some personality traits developed because they helped our ancestors survive and reproduce.
Examples include:
- Cooperation
- Leadership
- Caution in dangerous situations
- Protecting family members
- Forming social relationships
These traits may have increased survival and reproductive success, making them more common over generations.
Important Point
The biological approach does not claim that personality is entirely determined by genes. Instead, personality develops through an interaction between:
- Genetics
- Brain and nervous system
- Hormones
- Environment
- Life experiences
- Culture
This interaction explains why even people with similar genetic backgrounds can develop different personalities.
Easy Read Summary
🧬 Biological Approach to Personality
- Our personality is influenced by our genes and biology.
- Identical twins often have similar personalities, even if raised apart.
- Temperament is our natural personality style from birth.
- Babies may be easy, difficult, or slow to warm up.
- Our personality is shaped by both nature (biology) and nurture (life experiences).
- Evolution may explain why some personality traits helped humans survive and continue through generations.
Key Terms
- Biological approach: Explains personality using genetics and biology.
- Genetics: Traits inherited from parents.
- Heritability: How much genetics influences differences between people.
- Temperament: Natural emotional style present early in life.
- Reactivity: How strongly someone responds to events.
- Self-regulation: The ability to control emotions and behavior.
- Evolutionary psychology: The study of how evolution has influenced human behavior and personality.
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