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Re:Day 1: IBM Watson Ties for first on Jeopardy by lrm242 on Tuesday February 15, 2011 @10:18AM (#2221473)
That's correct. Watson only learns from correct answers after a question has been completed. This is mentioned specifically int he Nova documentary.
Re:Day 1: IBM Watson Ties for first on Jeopardy by nchlswu on Tuesday February 15, 2011 @10:26AM (#2221507)
Looks like this isn't too clear. An IBM spokesperson said he can't hear what other players are saying at all and only takes input from the question board. (http://latimesblogs.latimes.com/technology/2011/02/ibms-wats...)

Regardless, Watson only selectively takes input, if it does at all.