Are David's emotions real?

Let's remind ourselves for a moment what an emotion is: "any strong mental or instinctive feeling, as pleasure, grief, hope, fear, etc., deriving esp. from one's circumstances, mood, or relationship with others." There's no doubt that David would pass a Turing intelligence test, but are his emotions anything like our own? When you experience emotion, what you are basically admitting to is that you are out of control. Your thoughts and actions are driven by deep-rooted physical mechanisms over which you have little or no control yourself, that is all. David smiles to give the human audience an indication that he is pleased by something, and in this respect he is out of control. But does he FEEL pleased? It would be easy enough to produce the smiley indicator in a robot (as opposed to, say, a happy cat that might start purring instead) based on a degree of innate pleasure, but can a robot actually experience pleasure in the same way as a human? Perhaps, but very unlikely I would imagine. You can ask the same question of all the other emotions. Does he experience pain, for example? Pain is a distinct automatic emotional state in humans, as opposed to the simple recognition of a particular stimulus that might be doing you harm (either directly or indirectly). I can't see David getting into a panic and out of control when this happens to him. I'd say that David's emotions are real enough, but they cannot be the same as human emotions. Because for that to be the case he would require a human brain. For these reasons, we must be very careful indeed in assigning human qualities to him. Things like whether he is evil or not; whether he experiences regret or hate; whether he truly likes or fears something. He's a robot, and thinks in very different ways to us. He does what he does. As do the Engineers.