I will argue that in the literal sense the programmed computer understands what the car and the adding machine understand, namely, exactly nothing.
John SearleYou can't *discover* that the brain is a digital computer. You can only *interpret* the brain as a digital computer.
John SearleBecause we do not understand the brain very well we are constantly tempted to use the latest technology as a model for trying to understand it. In my childhood we were always assured that the brain was a telephone switchboard...Sherrington, the great British neuroscientist, thought the brain worked like a telegraph system. Freud often compared the brain to hydraulic and electromagnetic systems. Leibniz compared it to a mill...At present, obviously, the metaphor is the digital computer.
John SearleDarwin's greatest achievement was to show that the appearance of purpose, planning, teleology (design), and intentionality in the origin and development of human and animal species was entirely an illusion. The illusion could be explained by evolutionary processes that contained no such purpose at all. But the spread of ideas through imitation required the whole apparatus of human consciousness and intentionality
John Searle