Module 4: Human Emotion
Module 4:
Human Emotion
📚 Part 1, Human Emotion
What is Emotion?
In this lesson we explore what emotions are, why we experience them and how psychologists explain them. Emotion is much more than simply feeling happy or sad. It is a complex experience involving our thoughts, physical reactions and behaviours.
Key Learning Points
- Emotion is a combination of subjective feelings, biological responses and behaviour.
- Emotions influence how we think, react and interact with others.
- Emotional experiences are usually short lived but can strongly affect our behaviour.
Theories of Emotion
Psychologists have developed several theories to explain where emotions come from and how they are experienced.
Evolutionary Theory (Charles Darwin)
Darwin believed emotions evolved because they helped our ancestors survive.
Key ideas
- Emotions are the product of evolution.
- Fear helped humans respond quickly to danger.
- Facial expressions communicate important information to others.
- Basic emotions such as happiness, sadness, anger, fear, surprise and disgust are universal.
James, Lange Theory
William James and Carl Lange suggested that our bodies react first and then we experience emotion.
For example:
- We do not run because we are afraid.
- We feel afraid because we notice our body running and our heart racing.
This theory suggests that different physical responses create different emotional experiences.
Cannon, Bard Theory
Walter Cannon disagreed with James and Lange.
He argued that:
- Physical reactions and emotions happen at the same time.
- The brain processes emotional information while also activating the body's physiological responses.
Schachter and Singer's Two Factor Theory
This theory proposes that emotion depends on two things:
- Physiological arousal.
- Our interpretation of what caused that arousal.
For example, a racing heart before an exam may be interpreted as anxiety because of the situation you are in.
The theory highlights the importance of both the body and the mind in creating emotional experiences.
📝 Part 1 Summary
Emotion is influenced by both our biology and our interpretation of events. Different psychological theories explain emotion in different ways, with some focusing on evolution, others on bodily reactions and others on how we interpret those reactions. Together they provide a fuller understanding of why we experience emotions.
🧠 Part 2, The Biological Component of Emotion
Emotion and the Brain
This lesson explores how the brain and nervous system work together to create emotional experiences.
The Limbic System
The limbic system is closely involved in emotion.
The amygdala plays an especially important role by helping us detect emotionally significant events, particularly fear and danger.
The Autonomic Nervous System
The autonomic nervous system controls many automatic bodily functions and has two main branches.
Sympathetic Nervous System (Fight or Flight)
When we experience danger or stress, the sympathetic nervous system prepares the body for action.
Common responses include:
- Dilated pupils.
- Faster heartbeat.
- Rapid breathing.
- Sweaty palms.
- Goosebumps.
- Increased blood sugar.
- Reduced digestion.
- Increased blood flow to the muscles.
Parasympathetic Nervous System (Rest and Digest)
Once the danger has passed, the parasympathetic nervous system helps return the body to its normal resting state.
Typical effects include:
- Slower heart rate.
- Slower breathing.
- Constricted pupils.
- Digestion resumes.
- Reduced adrenaline production.
- The body conserves energy.
Measuring Emotion
Researchers can measure emotional responses by monitoring changes in the body.
Common measures include:
- Heart rate.
- Blood pressure.
- Breathing rate.
- Skin conductivity (galvanic skin response).
Researchers may also use a polygraph (lie detector), although it measures physiological arousal rather than whether someone is actually telling the truth.
Expressing Emotion
People communicate emotions through:
- Facial expressions.
- Body language.
- Tone of voice.
- Posture.
- Gestures.
Psychologists believe these non verbal signals often reveal emotional states.
The Facial Feedback Hypothesis
This theory suggests that facial expressions do not simply reflect emotions but may also influence them.
For example, deliberately smiling may make someone feel happier, while frowning may increase feelings of sadness.
Emotion and Culture
Although many emotions are universal, culture influences how emotions are expressed.
Research has shown that:
- Basic physiological responses to emotion are widespread.
- Different cultures may classify emotions differently.
- Emotional expressions vary across cultures.
- Social expectations influence when and how emotions are displayed.
📝 Part 2 Summary
Emotions are closely connected to the brain and nervous system. The sympathetic and parasympathetic nervous systems help prepare the body for action and then restore balance afterwards. Emotions can be measured through physiological changes, expressed through facial expressions and body language, and influenced by both biology and culture.
📖 Module 4 Revision
You should now be able to:
✅ Define emotion.
✅ Explain Darwin's evolutionary theory of emotion.
✅ Compare the James, Lange, Cannon, Bard and Schachter and Singer theories.
✅ Describe the role of the amygdala and limbic system.
✅ Explain the sympathetic and parasympathetic nervous systems.
✅ Identify common physiological signs of emotion.
✅ Understand how psychologists measure emotional responses.
✅ Explain the Facial Feedback Hypothesis.
✅ Describe how culture influences emotional expression.
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