It was found that episodes of mind wandering, especially early on in the text led to decreased identification of the villain and worse results on both factual and deducible questions.
However, a degree of independence is also asserted of emergent properties, so that they are not identical to, or reducible to, or predictable from, or deducible from their bases.
A curious side effect of numbering every cell is that when the puzzle is completed, the numbers alone unambiguously define the solution, the actual borders being trivially deducible.