A psychological experiment on inferring presence or absence of attention to individual visual stimuli presented in a brief exposure duration is performed. The experiment is based on both gaze point and the timing of a spontaneous blink. Each stimulus was randomly presented on either the left or right side of a display. Subjects are requested to appropriately allocate attention to both sides of the display. Although the presence of attention to only about 50% of all stimuli based on gaze point is inferred, the presence of attention to over 80% of all stimuli can be inferred by adding the blink timing together as a physiological measure. These results suggest that a spontaneous blink tends to occur immediately after the completion of detecting a peripherally presented stimulus.
