A glowing protein tracks serotonin levels and location in the brains of living mice and could yield clues to the neurotransmitter’s role in autism.

The drug popularly known as ecstasy may boost sociability through brain circuits distinct from that underlying its ‘high.’

The ability to learn from social experiences wanes by adulthood, at least in mice — but the recreational drug ecstasy may bring it back.

Serotonin, the brain chemical best known for its link to depression, may also be involved in autism.

Women whose children are severely autistic have lower serotonin levels than do those whose children have mild or moderate autism traits.

Boosting the levels of the chemical messenger serotonin makes mice that model autism more social — and brings new hope to a shelved theory in autism.

A drug that keeps neurons bathed in the chemical messenger serotonin prevents social abnormalities in a mouse model of dup15q syndrome.

A movement to ban valproate during pregnancy gains a foothold in France, people with auditory hallucinations seek to demedicalize the experience, and adults on the spectrum speak out.