Article 1 Astrocytes 1 Basal Ganglia 1 Basal ganglia 1 Brain 1 Dopamine 1 Glia 1 Humans 1 Speech 1 Vocalization astrocyte 1 basal ganglion 1 brain 1 brain region 1 dopamine 1 dopaminergic system 1 feedback system 1 frequency modulation 1 glia cell 1 human 1 motor control 1 motor performance 1 pathophysiology 1 speech 1 striate cortex 1 stuttering 1 vocalization 1