A disruption in circadian rhythm is common among mental health disorders. Understanding its molecular foundation could unlock better treatments.

The tics associated with Tourette syndrome have a fractal pattern, report researchers. And, a characteristic of that pattern can predict how severe the disease will get.

Tics like excessive blinking or sniffing don't go away completely, research shows. Instead, kids just get better at suppressing them in public.

A brain circuit that underlies repetitive behavior in roundworms could shed light on Tourette's and autism in humans.