Head twitch response

We were talking the other day (or I was typing and you guys were reading) about serotonin. I found an article with a good description:

"Serotonin has tremendous influence over several brain functions, including the control of perception, cognition, sleep, appetite, pain, and mood and mediates these effects through interactions with receptors located throughout the central and peripheral nervous systems."

In this study they looked at the difference between serotonin in the brain and hallucinogens. Apparently they work differently, since serotonin works through different pathways in the brain.

Another great quote:

"Both serotonin and the N-methyltryptamines produce what is known as a head twitch response in animal models, which indicates that the serotonin 2A receptor has been activated."

Seriously? "Head twitch response?" Love the side effects.