[ABSTRACT] Brain SPECT is a neuroimaging technique, which allows the study of several functional aspects of the human brain, in vivo and in a non-invasive way. The study of the central nervous system neuro-receptors using this technique has been introduced recently, and relevant data on the psychopathology and psychopharmacology research of the psychotic disorders has been provided so far. Using iodobenzamide labelled with 123-iodine (123I-IBZM, a raclopride analog), as a ligand or tracer for th