Comment by shard

Not the OP, but in the book Impro, Keith Johnstone strongly lamented the suppression of imagination in and by grown-ups. He wrote: "Most children can operate in a creative way until they are eleven or twelve, when suddenly they lose their spontaneity, and produce imitations of 'adult art'." He cites schools suppressing imagination as a factor, saying that, "The research so far shows that imaginative children are disliked by their teachers."

I feel that suspension of disbelief and imagination are closely related, as a lack of suspension of disbelief will close you off to many avenues of imagination.