People blind from birth use colour terms competently
People who are blind from birth but use colour terms correctly lack the usual semantic hookup but still display linguistic competence. For example, they can say: "the sky is blue" and  "you shouldn't wear an orange tie with a red jacket".

Richard Sharvy, 1983, p.129.
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Artificial Intelligence »Artificial Intelligence
Can computers think? [1] »Can computers think? [1]
Yes: physical symbol systems can think [3] »Yes: physical symbol systems can think [3]
The Chinese Room Argument [4] »The Chinese Room Argument [4]
The Syntax-Semantics Barrier »The Syntax-Semantics Barrier
Notion of semantic hookup is problematic »Notion of semantic hookup is problematic
People blind from birth use colour terms competently
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