William,
> It is very simple and I wouldn't apply it to everything that
> behaviourists would (we don't get direct rewards for solving crossword
> puzzles).
How do you know that we don't get direct rewards on solving crossword
puzzles (or any other mental task)?
Chances are that under certain mental condition ("achievement state"),
brain produces some form of pleasure signal.
If there is no such reward, then what's your explanation why people
like to solve crossword puzzles?
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