Your brain receives, stores, and processes information, dispenses results, and controls your biological equipment. When properly programmed, computers can do likewise, except that they control electromechanical rather than biological equipment. Beyond these functional similarities, computers and brains have virtually nothing in common. To begin with, the electronic circuits in a computer are not analogous to brain cells. The two differ in appearance, in structure, and in principles of operation. The key functions of information storage and information processing are served in computers by physically different components. In a typical computer, one finds separate CPU and memory units; but even in computer designs where processing circuits are intermixed, the two functions remain distinct. In the brain they are not distinct; they're distributed throughout the brain and intermixed in ways that we don't understand.