Eye-movements during prolonged reading.

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Abstract
Thirty subjects read for 4 hrs. under relatively normal conditions. The electroculogram was used to record eye-movements. Nine five-min. samples were taken of each continuous electroculogram the first 5 min. of the 4-hr. period and the last 5 min. of each half-hr. For each sample period, 7 measures of eye-movements were studied by means of the analysis of variance and t-test techniques. The number of fixations made and the number of lines read decreased during the 4-hr. period. The number of blinking movements and the standard deviation of the number of fixations/line increased. The changes in the number of regressions made were sporadic and seldom significant. The number of fixations/line and the number of regressions/line did not show significant changes until the end of the 4-hr. reading period. The analysis of the data indicates that under the conditions of this expt. both time and individual differences are important factors influencing eye-movement performance. Problems of visual fatigue are discussed in relation to the findings of the present expt.

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