An interesting experiment would be to test with close captioning which, in North America at least, uses white on black. Another side experiment could be conducted to see if it has any impact on how much attention the show receives (if white on black is simply better at retaining attention than black on white).While this only tests a certain setting where subjects are used to seeing black and white it would provide what you are looking for. A long term experiment where people recognize black on white as the norm would be difficult to carry out.
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