Gaboxadol hydrochloride (intraperitoneal injection; 0.5, 1, 1.5, 2, 3, 4, or 5 mg/kg; once daily; three-day interval) normalizes the distance traveled by Fmr1 KO2 mice to WT activity levels at 0.5 mg/kg, additionally, this compound has no effect on locomotor activity in Fmr1 KO2 mice.