Abstract
This study adapted three analyses to spontaneous interblink intervals to investigate the temporal fractal in the human eyeblink. First, periodic regularity was qualitatively investigated with one-dimensional maps. Second, the regularity was quantitatively measured by the Poisson regime test. Third, the temporal fractal dimensions were estimated from the regression coefficients of cumulative frequency distribution of the log-log histograms. The behavior of eyelids was optically measured and transformed into point-series data in three conditions : with no, passive and active stressers respectively. The results were as follows : first, the blinking patterns change mainly in period three or four. Second, the intervals change not at random but with statistically significant regularity. Third, the fractal dimension in subjects with no or passive stressers exhibited great value compared with that in subjects with active stresser. Those results suggest that the spontaneous blink patterns have regularity with various time scales, even though the blink seems to occur randomly, and that the scale which is defined as temporal fractal dimension mainly changes according to the psychological attitudes of subjects.
