Aerospace Medicine Technical Reports
FAA Office of Aerospace Medicine
Civil Aerospace Medical Institute
Report No: DOT/FAA/AM-69/15
Title and Subtitle: The spiral aftereffect. II. Some influences of visual angle and retinal speed on the duration and intensity of illusory motion.
Report Date: August 1969
Authors: Williams MJ, Collins WE.
Abstract: Visual illusions have been a persistent problem in aviation research. The spiral aftereffect (SAE) is an example of one type of visual illusion--that which occurs following the cessation of real motion. Duration and intensity of the SAE was evaluated under five conditions. Results indicate that perceived (rather than physical) characteristics of the stimulus situation may have the most significant effects on duration of the SAE. The findings thus have considerable pertinence to the evaluation of effective factors in the production of a variety of other visual illusions which can occur in aviation environments.
Key Words: ILLUSIONS, AVIATION MEDICINE, VISION, SCIENTIFIC RESEARCH, AFTERIMAGES, MOTION, STIMULATION (PHYSIOLOGY), RETINA, RESPONSE (BIOLOGY), PERFORMANCE (HUMAN), TEST EQUIPMENT, CIVIL AVIATION.
No. of Pages: 16
Civil Aerospace Medical Institute
Report No: DOT/FAA/AM-69/15
Title and Subtitle: The spiral aftereffect. II. Some influences of visual angle and retinal speed on the duration and intensity of illusory motion.
Report Date: August 1969
Authors: Williams MJ, Collins WE.
Abstract: Visual illusions have been a persistent problem in aviation research. The spiral aftereffect (SAE) is an example of one type of visual illusion--that which occurs following the cessation of real motion. Duration and intensity of the SAE was evaluated under five conditions. Results indicate that perceived (rather than physical) characteristics of the stimulus situation may have the most significant effects on duration of the SAE. The findings thus have considerable pertinence to the evaluation of effective factors in the production of a variety of other visual illusions which can occur in aviation environments.
Key Words: ILLUSIONS, AVIATION MEDICINE, VISION, SCIENTIFIC RESEARCH, AFTERIMAGES, MOTION, STIMULATION (PHYSIOLOGY), RETINA, RESPONSE (BIOLOGY), PERFORMANCE (HUMAN), TEST EQUIPMENT, CIVIL AVIATION.
No. of Pages: 16
Last updated: Friday, June 1, 2012