Cognitive psychologists distinguish between 2 types of consciousness: spotlight and lantern. Spotlight means attention is focussed on one point. Lantern means that attention is more broad.
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Children tend to have lantern consciousness.
Lantern leads to more association, dreaminess, and making interesting connections - creativity.
Spotlight allows one to focus on one specific area in a linear and efficient way.
Caffeine allows one to have more efficient spotlight consciousness, in comparison to most psychedelic drugs which tend to allow lantern creativity.