"Could a machine think?" my own view is that only a machine could think, and indeed only very special kinds of machines, namely brains and machines that had the same causal powers as brains... Whatever else intentionality is, it is a biological phenomenon, and it is as likely to be as causally dependent on the specific biochemistry of its origins as lactation, photosynthesis, or any other biological phenomena.
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Citation
Searle, John R. "Minds, Brains, and Science." Reith Lectures. BBC Radio 4. 1984. Radio.