One of the main strengths of biological explanations for schizophrenia is their high scientific credibility. These explanations are grounded in measurable, objective evidence, such as brain scans, neurochemical analysis, and genetic studies, which give them strong empirical support. For example, research consistently shows structural abnormalities in the brains of some individuals with schizophrenia, such as enlarged ventricles, and a higher concordance rate for schizophrenia in identical twins compared to fraternal twins.