Pairs of subjects were shown a series of color slides in various shades of blue and asked to identify the colors.

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While the color offset is fine for viewing baby's play habits, it's not very useful when trying to identify the colors of a perpetrator's clothing to police.

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Then, participants performed what is known as the Stroop task where they were asked to identify the color of various words flashed on a screen, which spell out the names of other colors.

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