Tests of hallucinations of "Ruth'.
Some tests are reported on a young woman who was believed to have unusual powers of eidetic imagery and voluntary control of vivid hallucinations. No evidence was found of abnormal eidetic ability. Measurements of detection thresholds for light of different wavelengths, while the subject tried to hallucinate various colours, suggested that the supposed hallucinations acted like coloured filters held over the eye.
D000360:Afterimage; D003118:Color Perception; D004538:Eidetic Imagery; D005260:Female; D006212:Hallucinations / Q000523:psychology; D006801:Humans; D012043:Regression, Psychology; D012684:Sensory Thresholds