Final answer:
CT and MRI scans indicate that individuals with schizophrenia commonly have enlarged ventricles, which is a structural brain abnormality.
Step-by-step explanation:
The CT scans and MRI scans suggest that the brains of persons suffering from schizophrenia have enlarged ventricles. This is a structural abnormality often found in individuals with schizophrenia, where the cavities in the brain that contain cerebrospinal fluid are larger than normal. Studies such as Lawrie, S. M., & Abukmeil, S. S. (1998) and Colibazzi, T., et al. (2013) support this finding. Increased dopamine levels are indeed associated with schizophrenia, but they are more related to the neurotransmission processes rather than brain structure which is what CT and MRI scans depict. Reduced amygdala activity and enhanced prefrontal cortex functioning refer to functional aspects that might not be directly observable through structural imaging techniques.