Mailbag XL: Is Fear a Neurotransmitter? | Fear, Brain Chemistry, Neurotransmitters, Amygdala, Dopamine, and the Neuroscience of Emotion

Is fear a neurotransmitter?

Can an emotion travel through the brain like dopamine, serotonin, glutamate, or norepinephrine?

Or is saying that “fear itself can become a neurotransmitter” a poetic metaphor that crosses a scientific line?

In Mailbag XL of The Observable Unknown, Dr. Juan Carlos Rey responds to listener Margaret R., who asks for clarification about a haunting phrase from an earlier Interlude:

Is fear literally a neurotransmitter, or was that metaphorical language?

The answer is clear.

Fear isn’t a neurotransmitter.

But understanding why reveals something far more interesting about fear, neurochemistry, consciousness, threat processing, memory, emotional contagion, and the relationship between scientific language and metaphor.

What Is a Neurotransmitter?

A neurotransmitter is a chemical messenger used by neurons to communicate.

Neurons can release chemical substances that interact with receptors on other cells, changing the activity of those cells and helping information move through nervous-system networks.

Examples include: