Abstract
Readability of text moved horizontally along a single line on a computer display was studied as a function of two line lengths and three jump lengths. In the experiment text was advanced in continuous jumps of one or several characters at a time and the speed of text display was controlled in real time by subjects via a control knob. The results showed that jump lengths of five and nine character spaces resulted in a higher reading rate than the one-character jump condition. Furthermore, text appearing in 20-character windows was read as fast as text in 40-character windows. However, when text was advanced one character space at a time, the small window condition resulted in higher comprehension than the large window condition. Implications of these results for reading self-paced computer displays are discussed.
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