Study of a gazing recognition system based on light reflex during steady-state stimulation

Abstract

In recent years, it is known that the pupillary light reflex occurs to the bilateral pupil when light stimulation is applied only to either pupil, but there remains the argument about the light reflex when distinct light stimulation presented to the left and right pupils. In this study, we observe the pupil responses when visual stimuli of 1.2 Hz are presented to the left eye and 1.5 Hz to the right eye for 10 participants. As a result of the frequency analysis of the pupil fluctuation, it is clarified that the peaks of the spectrum are detected in the same two frequency bands as the visual stimulation, and the time variations of the bilateral pupil are observed as the superposition. This result suggests the possibility that a pupillary light reflex treats the light stimulus to the left and right pupils as equals.