Incubation: letting it all sink in "thinking aside", as you're essentially putting your brain on the shelf and stepping away. By turning off your mind this way, you're allowing the information to set in and that subsequent spark of creativity the necessary room to ignite.
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research conducted by psychologist Eddie Harmon-Jones and his colleagues suggests that the critical variable influencing one’s scope of attention is not emotional valence (positive vs. negative emotions) but motivational intensity, or how strongly you feel compelled to either approach or avoid something.
I'm a quasi-only child. With my brother and sister, I've more of a tendency to be semi-maternal. So, yes, I spent a lot of time talking to myself - I had this big dressing-up box and would just dress up as lots of characters and talk back to myself... Verging on schizophrenia, I suppose, if you analyse it carefully.