Reliability of blinking frequency employed as a measure of readability.

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Abstract
This study is concerned with the consistency of response for rate of in voluntary blinking as a measure of readability. The blink rates were recorded during each of 6 successive reading periods of 5 mins. each. Data from 2 groups of subjects showed similar trends. The blink rate consistency was fairly high from one reading period to the next (median r = about .88). When an interval of reading intervenes between the periods in which the blinks are counted, however, the reliability coefficient barely attains the level required for group comparisons of data. It is concluded that blink-rate has adequate reliability when successive periods of reading are involved, but that when a period of reading intervenes between the periods in which the blinks are counted, the reliability is close to the level of undesirable inconsistency.

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