article 8 clinical article 8 extrapyramidal symptom female 8 human 8 priority journal 8 aged 6 male 6 Alzheimer disease 4 adult 4 brain blood flow 4 controlled study 4 frontal lobe 4 hexamethylpropylene amine oxime technetium tc 99m 4 motor performance 4 neuroleptic agent 4 neuropsychological test 4 parkinsonism 4 single photon emission computer tomography 4 Acute challenge 2 Aged 2 Alzheimer's disease 2 Apomorphine 2 Basal Ganglia Diseases 2 Bipolar Disorder 2 Cognition Disorders 2 Cross-Sectional Studies 2 Dementia 2 Drug-induced parkinsonism 2 Executive 2