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Disdrimination; *Visua) Perception; Word

By Edri Price and N. R. Mcconkie

Abstract

ABSTRACT. A study investigated the size of the poceptual span within which adults ute infprpation to distinguish among letters as therread. The eye movements.of fifteen college ttudents' were monitored as they read passag0 from a cathode-ray tube. On occasional fixations,-letters in specified visual regiont were replaced by other letters,. The effeots of this manipulation were 'observed on subjects ' eye movement patterns. Resurts shoved that erroneous letters lying four, or more letter popitions to the left of the fixated letter, or eight or more to the right, had-no discernible effect on.reading. In addition, there was no evidence to indicate that prior research in *lich letteri were replaced on every fixation had underestimated thertize of the perceptual span. The fact that the study yielded a small * estimate of the perceptual span and showed smaller effects from letter"replacement than have previous studies can be explained by methodological differences in the asPect of the text stiMulus being ttudied. (Materials used in the sttidy'are appended.) (Authpr/Fl)' 3

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