Two experiments were conducted to establish normative values for various measures of endogenous blink activities in each age and gender group, using relatively large samples and similar tasks. The ages of participants in Experiment 1 ranged from 3 months to 3 years and in Experiment 2 from 5 to 93 years. Video recording was performed during quiet resting for the former three age groups and an identical task of video watching was delivered to the latter 11 age groups. The major results were as follows: 1) the youngest infants blink infrequently, increasing gradually until the age of 9–10 years, with no statistical differences for the older age groups, 2) no differences in blink durations of closing, reopening, and total blink were obtained throughout all age groups in Experiment 2, whereas three age groups of infants aged less than 3 years in Experiment 1 showed some differences, and 3) the distribution patterns of blink frequency in each age group were roughly divided into three types.
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Toshiko Sugiyama, Hideoki Tada
