Psychologists have long known that a person sees more than he realizes. The brain registers impressions that flash past too quickly to be consciously noted, uses the subconscious impressions to shape opinions and ideas. This week a New York University psychologist told how subconscious sight was used to fool subjects into thinking that a static portrait was really changing.
N.Y.U.'s Donald P. Spence and George S. Klein, working with Sweden's Gudmund J. W. Smith, flashed a line drawing of an expressionless male face on a screen. They asked their 20 subjects to note how the expression of the face changed. Then they...
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