Mood, Neurotransmitters, and How to Change Your Chemistry

We hear about neurotransmitters and SSRIs on a daily basis, but what are they, exactly?

Here is a great metaphor for understanding neurotransmitters and mood.  Think of a light switch and a dimmer.  You turn the dimmer up to turn up the light intensity, and vice versa to decrease it.  The light represents neurotransmission (the messaging route) while the dimmer feature is the neurotransmitter (a chemical messenger like serotonin).  Neurotransmission is to the light what neurotransmitters are to the dimmer.
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