Northoff G, Koch A, Wenke J, et al. Catatonia as a psychomotor syndrome: a rating scale and extrapyramidal motor symptoms. Mov Disord 1999;14:404-16.
Ouchi Y, Okada H, Yoshikawa E, et al. Absolute changes in regional cerebral blood flow in association with upright posture in humans: an orthostatic PET study. J Nucl Med 2001;42:707-12.
Northoff G, Steinke R, Czcervenka C, et al. Decreased density of GABA-A receptors in the left sensorimotor cortex in akinetic catatonia: investigation of in vivo benzodiazepine receptor binding. J Neurol Neurosurg Psychiatry 1999;67:445-50.
Northoff G, Steinke R, Nagel DC, et al. Right lower prefronto-parietal cortical dysfunction in akinetic catatonia: a combined study of neuropsychology and regional cerebral blood flow. Psychol Med 2000;30:583-96.
Gusnard DA, Raichle ME. Searching for a baseline: functional imaging and the resting human brain. Nat Rev Neurosci 2001;2:685-94.