Besides the amygdala, there are other neuropathological areas of degeneration as well; the overall brain volume can also be measured. Research shows that the overall brain volume is not statistically significantly different between patients with bipolar disorder and patients with schizophrenia, except when making comparisons in the intracranial volume.[14][non-primary source needed] A larger intracranial volume is present in the brains in bipolar disorder, but no variation occurs in the brains of people with schizophrenia.[14]