"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.

John R. Searle

Minds, Brains, and Programs

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Citation

Searle, John R. "Minds, Brains, and Science." Reith Lectures. BBC Radio 4. 1984. Radio.