Propositional codes aren't required
A 3rd propositional code required to translate between visual and verbal code would require a 4th code to translate from verbal to propositional code, and a 5th to translate verbal code to the new intermediary code—leading to an infintite regress.
John Anderson, 1978.



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Artificial Intelligence »Artificial Intelligence
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Can computers think? [1] »Can computers think? [1]
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No: computers can't understand images [5b] »No: computers can't understand images [5b]
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Images are secondary to propositions »Images are secondary to propositions
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Dual code theory explains knowledge adequately »Dual code theory explains knowledge adequately
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Dual codes are too indeterminate »Dual codes are too indeterminate
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Propositional codes aren't required
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