title: Unconditioned response to light in Limulus: role of time of day, day of testing and intertrial interval.
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D003386:Brachyura / Q000502:physiology*; D002940:Circadian Rhythm; D003623:Dark Adaptation; D006185:Habituation, Psychophysiologic; D008027:Light; D013997:Time Factors