The MPC insanity test combines which two standards?

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The key idea is that the Model Penal Code insanity standard blends cognitive and volitional elements. It asks whether mental disease or defect causes the defendant to lack substantial capacity either to appreciate the criminality of the conduct or to conform to the law. This combines the M'Naghten idea (knowing right from wrong) with the Irresistible Impulse idea (inability to control one’s actions). In other words, the MPC codifies a single test that incorporates both aspects. The Durham rule is a separate, broader standard not used by the MPC. Therefore, the correct understanding is that the MPC insanity test is a combination of M'Naghten and Irresistible Impulse.