| Neurotransmitter | Function | Effect |
|---|---|---|
| Dopamine | Inhibitory | Fine movement, emotional behavior. Implicated in schizophrenia and Parkinson’s disease. |
| Serotonin | Inhibitory | Sleep, mood, eating behavior. Implicated in mood disorders, anxiety, and violence. |
| Norepinephrine | Excitatory | Arousal, wakefulness, learning. Implicated in anxiety and addiction. |
| Gamma-aminobutyric acid (GABA) | Inhibitory | Anxiety states. |
| Acetylcholine | Excitatory | Arousal, attention, movement. Increase = spasms and decrease = paralysis. |