Pupillary activity measured by reflected infra-red light.
D000818:Animals; D001699:Biometry / Q000295:instrumentation; D002415:Cats; D003214:Conditioning, Classical / Q000502:physiology; D004597:Electroshock; D007259:Infrared Rays; D010827:Physiology / Q000295:instrumentation*; D011680:Pupil / Q000502:physiology*; D013016:Sound