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When soldiers were asked to rate their commanding officers in an early psychology experiment conducted by Edward L. Thorndike, he found high cross-correlation between all positive and all negative traits. People seem to rarely think of each other in mixed terms; instead we seem to see them as universally roughly good or roughly bad across all categories of measurement. Solomon Asch also performed research in this area.
A common example of the halo effect is when a person is assumed to be smart or nerdy because they are wearing spectacles.