DRD2 and Anxiety: Patients were included in the study 1 year after TBI, with executive function deficits as determined by neuropsychological testing. PET showed decreased binding to DAT in the caudate, putamen, and ventral striatum and increased D2R in the ventral striatum.Regarding the mood or anxiety in the patients, it is only mentioned that 4 of the subjects with TBI were taking antidepressants.