The upside of dyslexia is better peripheral perception:
Gadi Geiger and Jerome Lettvin, cognitive scientists at the Massachusetts Institute of Technology, used a mechanical shutter, called a tachistoscope, to briefly flash a row of letters extending from the center of a subject’s field of vision out to its perimeter. Typical readers identified the letters in the middle of the row with greater accuracy. Those with dyslexia triumphed, however, when asked to identify letters located in the row’s outer reaches.
Mr. Geiger and Mr. Lettvin’s findings, which have been confirmed in several subsequent studies, provide a striking demonstration of the fact that the brain separately processes information that streams from the central and the peripheral areas of the visual field. Moreover, these capacities appear to trade off: if you’re adept at focusing on details located in the center of the visual field, which is key to reading, you’re likely to be less proficient at recognizing features and patterns in the broad regions of the periphery.
The opposite is also the case. People with dyslexia, who have a bias in favor of the visual periphery, can rapidly take in a scene as a whole — what researchers call absorbing the “visual gist.”
Intriguing evidence that those with dyslexia process information from the visual periphery more quickly also comes from the study of “impossible figures,” like those sketched by the artist M. C. Escher. A focus on just one element of his complicated drawings can lead the viewer to believe that the picture represents a plausible physical arrangement.
A more capacious view that takes in the entire scene at once, however, reveals that Escher’s staircases really lead nowhere, that the water in his fountains is flowing up rather than down — that they are, in a word, impossible. Dr. Catya von Károlyi, an associate professor of psychology at the University of Wisconsin, Eau Claire, found that people with dyslexia identified simplified Escher-like pictures as impossible or possible in an average of 2.26 seconds; typical viewers tend to take a third longer. “The compelling implication of this finding,” wrote Dr. Von Károlyi and her co-authors in the journal Brain and Language, “is that dyslexia should not be characterized only by deficit, but also by talent.”