Psych Explained: The Amygdala

Introduction

• Focus on the amygdala
• Major function: detecting threats
• Questions for consideration:
  • What constitutes a threat?
  • Is fear of certain things (e.g., spiders, snakes) innate or learned?

Structure and Location

• Shape: Almond-shaped, hence the name "amygdala"
• Location: Deep within the temporal lobes
• Lobes of the Brain:
  • Frontal lobe (front)
  • Temporal lobes (sides)
  • Parietal lobe (top)
  • Occipital lobe (back)
• Plural Structure: Two amygdalas, hippocampuses, and thalami (one in each hemisphere)

Limbic System

• Function: Involves emotions and memories
• Components:
  • Thalamus
  • Amygdala
  • Hippocampus
  • Hypothalamus
• Role: Often referred to as the emotional center of the brain

Research Methods

• Animal Research: Due to ethical concerns, often conducted on animals like lab rats or rhesus monkeys
• Lesioning: Damaging or removing parts of the brain to study effects
  • Results in reduced fear and aggression when amygdala is damaged
  • Increased aggression and fear when stimulated

Functions of the Amygdala

1. Detecting Threats

• Evolutionary Role: Identifying dangers that threaten survival
• Amygdala Hijack: Emotions overwhelming logical thought (e.g., fear of public speaking)
• Pathways:
  • Direct path from thalamus to amygdala
  • Information reaches amygdala before the visual cortex, triggering an initial reflex response

2. Triggering Body Response

• Fight or Flight Response:
  • Triggered by hypothalamus signaling pituitary and adrenal glands
  • Increases in norepinephrine, adrenaline, and cortisol
• HPA Axis: Hypothalamus, Pituitary, and Adrenal glands working together

3. Fear Conditioning

• Conditioning: Forming associations with traumatic events
• Example: Rat conditioned to fear a tone after it becomes associated with a shock

4. Intensity of Emotions

• Research: Shows amygdala responds to both negative and intense positive emotions

Conclusion

• Main Takeaway: Amygdala is involved in the intensity of emotions, whether positive or negative
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