Serotonin vs Dopamine (Know The Differences)

Of the various neurotransmitters that people confuse with each other, serotonin and dopamine are the two highest on the list (with oxytocin coming third as people often attribute its effects to serotonin). But, for all they are both “happiness molecules”, serotonin and dopamine are quite different, and are even opposites in some ways:

More than just happiness

Let’s break it down:

Similarities:

• Both are neurotransmitters, neuromodulators, and monoamines.
• Both impact cognition, mood, energy, behavior, memory, and learning.
• Both influence social behavior, though in different ways.

Differences (settle in; there are many):

• Chemical structure:
  • Dopamine: catecholamine (derived from phenylalanine and tyrosine)
  • Serotonin: indoleamine (derived from tryptophan)
• Derivatives:
  • Dopamine → noradrenaline and adrenaline (stress and alertness)
  • Serotonin → melatonin (sleep and circadian rhythm)
• Effects on mental state:
  • Dopamine: drives action, motivation, and impulsivity.
  • Serotonin: promotes calmness, behavioral inhibition, and cooperation.
• Role in memory and learning:
  • Dopamine: key in attention and working memory
  • Serotonin: crucial for hippocampus activation and long-term memory

Symptoms of imbalance:

• Low dopamine:
  • Loss of motivation, focus, emotion, and activity
  • Linked to Parkinson’s disease and ADHD
• Low serotonin:
  • Sadness, irritability, poor sleep, and digestive issues
  • Linked to PTSD, anxiety, and OCD
• High dopamine:
  • Excessive drive, impulsivity, addictions, psychosis
• High serotonin:
  • Nervousness, nausea, and in extreme cases, serotonin syndrome (which can be fatal)

Brain networks:

• Dopamine: four pathways controlling movement, attention, executive function, and hormones.
• Serotonin: widely distributed across the cortex, partially overlapping with dopamine systems.

Speed of production:

• Dopamine: can spike and deplete quickly; fatigues faster with overuse.
• Serotonin: more stable, releasing steadily over longer periods.

Illustrative examples:

• Coffee boosts dopamine but loses its effect with repeated use.
• Sunlight helps maintain serotonin levels over time.

If you remember nothing else, remember this:

• Dopamine: action, motivation, and alertness.
• Serotonin: contentment, happiness, and calmness.

For more on all of the above, enjoy:

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Want to learn more?

You might also like to read:

Neurotransmitter Cheatsheet

Take care!