Normal readers were asked to mark the middle of visually presented words. They made systematic errors toward the left, indicating an overestimation of the length of the beginning of a word. The number of characters determines the size of this error. The bias extended to pseudowords, letter strings, and symbols, but not to blocks, dashes, and lines. Finally, the bias was sensitive to typographical errors but not to colour cuing. These findings suggest that special cognitive operations determine the perceived spatial extent of words. Implications for our understanding of perceptual and cognitive processes in reading are discussed.
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