In People v. Denton, 138 Mich App 568, 571; 360 NW2d 245 (1984), the Court stated that the defendant has the burden of showing that "he lacked the mental capacity to entertain the specific intent necessary for conviction of a particular crime." Once the defendant offers some evidence of diminished capacity, the prosecution has the burden of presenting proof of "undiminished capacity." Id. at 571-572.