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Introduction When we read, our eyes move systematically across the page. On average, we fixate on an area of text for about 250 msec, then move our eyes about seven letters to the right (Rayner, 1978). On a given fixation, about 17 letters, primarily to the right for readers of English, provide information important to reading. The letters surrounding the fovea (about 4 on each side of the fixated letter) are sufficiently visible for identification and for use in word access. Beyond this region, only letters to the right of fixation influence reading and eye movement behavior (Binder et al., 1999) and readers are able to identify letter shapes (to about nine letters from fixation) and gather word length information out to about 13 letters from fixation. When reading from a continually scrolling display, the letters available to the right of fixation are constantly changing. Buettner et al. (1986) reported that normally-sighted observers read about 15% slower from this display than fro |
