Suppose a child is born devoid of all senses; he has no sight, no hearing, no touch, no smell, no taste...nothing. There's no way whatsoever for him to receive any sensations from the outside world. And suppose this child is fed intravenously and otherwise attended to and kept alive for eighteen years in this state of existence. The question is then asked: Does this eighteen-year-old person have a thought in his head? If so, where does it come from? How does he get it?