title: The photo-sensitive organs of crayfish and brightness learning.
mesh_terms: D000818:Animals; D003400:Astacoidea / Q000502:physiology*; D001362:Avoidance Learning; D003213:Conditioning, Psychological; D004924:Escape Reaction; D006185:Habituation, Psychophysiologic; D007858:Learning; D008027:Light; D008124:Locomotion; D009043:Motor Activity; D009799:Ocular Physiological Phenomena; D010786:Photoreceptor Cells / Q000502:physiology*; D012679:Sense Organs / Q000502:physiology*; D013623:Tail / Q000502:physiology; D014785:Vision, Ocular