Stroke patients with visual area damage claim blindness to images projected there, yet they can detect some features. Others may have a similar ability to see what they don’t see.
A person's visual system may be designed to process information to which they may not be paying attention.
Regularly sighted people may similarly be designed to detect and react to unconscious visual stimuli. How does this relate to our racquetball game? Mike explained that like the blindsight patients, even though he couldn’t actually “see” the clock hands, he could surmise their position. This still sounded a bit fishy, and I suggested that he just might be a lucky guesser. Undeterred, he issued a challenge in a form that we both understood—an experiment!Rather than use individuals with stroke damage, we recruited 23 legally blind university students, defined as having 20/200 uncorrected vision .
The results were quite impressive! Some information about the time was being detected in their “blind” condition, despite protests from the subjects that they could see nothing but a blurry circle briefly appear on the monitor. The hour was correctly guessed 28 percent of the time, which was well above chance was a bit lower than with one clock face condition—as expected with this more difficult task—it was still significantly above chance .
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