I would like to add that the first example of telling the circuitry "go" and "stop" implies some processing on behalf of the circuitry such that it has an understanding of the meanings behind these symbols. This conveyed to me in some way that the author of the article was indicating that the circuitry had an understanding of these words (hence my lengthy discussion of symbol vs signal).
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Oh, one more thing...
I would like to add that the first example of telling the circuitry "go" and "stop" implies some processing on behalf of the circuitry such that it has an understanding of the meanings behind these symbols. This conveyed to me in some way that the author of the article was indicating that the circuitry had an understanding of these words (hence my lengthy discussion of symbol vs signal).