…by the serious parts, full of admiration at the incidents, his wits sharpened by the arguments, warned by the tricks, all the wiser for the examples, inflamed against vice, and in love with virtue; for in all these ways a good play will stimulate the mind of the hearer be he ever so boorish or dull; and of all impossibilities the greatest is that a play endowed with all these qualities will not entertain, satisfy, and please much more than one wanting in them, like the greater…
The chief thing I have to do is to attend at his dinners and suppers and allow him to eat what appears to me to be fit for him, and keep from him what I think will do him harm and be injurious to his stomach; and therefore I ordered that plate of fruit to be removed as being too moist, and that other dish I ordered to be removed as being too hot and containing many spices that stimulate thirst; for he who drinks much kills and consumes the radical moisture wherein life consists.
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The Psychs say it will stimulate a lot of the patterns we need.
James Dashner -- The Scorch Trials
Done to stimulate responses in the killzone, where the Flare does its damage.