i too have experienced this. most odd. i'm sure i recall some news story a year or so ago
about how thinking about going to the gym for ten minutes could be measurably as
physically beneficial as actually going to the gym (and working out, i presume) for ten
minutes. some media distorted scientific study of some sort.
also, recently
bumped into this ted talk:
this is your brain on improv
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ohm's where the art is