Duration of experienced lengthening and shortening of straight lines.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002540:Cerebral Cortex / Q000187:drug effects / Q000502:physiology; D003864:Depression, Chemical; D005403:Fixation, Ocular; D005500:Follow-Up Studies; D005556:Form Perception; D006591:Hexobarbital / Q000494:pharmacology; D006801:Humans; D007088:Illusions; D009903:Optical Illusions; D009949:Orientation; D012858:Size Perception; D013997:Time Factors; D014796:Visual Perception / Q000187:drug effects
D006591:Hexobarbital