Details:
The process in which a neuroblast acquires the specialized structural and functional features of a GABAergic inhibitory neuron in the basal ganglia. Differentiation includes the processes involved in commitment of a neuroblast to a GABAergic neuron. [GO_REF:0000021, GOC:cls, GOC:dgh, GOC:dph, GOC:jid, GOC:mtg_15jun06, PMID:16226447]