Trait anxiety affects the pupillary light reflex in college students

This study was designed to examine whether anxious personality, i.e. trait anxiety, influences the autonomic nervous functions in humans without manipulation of experimental stressors. The degrees of state and trait anxiety, blood pressure, heart rate, pupillary light reflex (PLR), and body temperature were measured at the same hour on four different days in 14 healthy college students. A multiple regression analysis showed that trait anxiety predominantly influenced state anxiety and the PLR parameters. A single regression analysis showed that trait anxiety positively correlated to the initial pupillary diameter and the constricted diameter of PLR and negatively to the amplitude of PLR. It was concluded that trait anxiety predicts state anxiety and a smaller amplitude of PLR in humans at rest.