4 aminobutyric acid 1 Adaptive behavior 1 Adolescent 1 Child 1 Child, Preschool 1 Cognition 1 Down Syndrome 1 Down syndrome 1 EEG 1 GABAA-α5 1 Humans 1 Intellectual Disability 1 Morpholines Oxazoles 1 Pyridines 1 Quality of Life 1 Treatment Outcome 1 Young Adult 1 adolescent 1 basmisanil 1 child 1 clinical trial 1 complication 1 controlled study 1 gamma-Aminobutyric Acid 1 human 1 intellectual impairment 1 morpholine derivative 1 oxazole derivative 1 phase 2 clinical trial 1