The spiral aftereffect : III, Some effects of perceived size, retinal size, and retinal speed on the duration of illusory motion.

Mehling, Kevin D.; Collins, William E.; Schroeder, David J.; Civil Aeromedical Institute

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The spiral aftereffect : III, Some effects of perceived size, retinal size, and retinal speed on the duration of illusory motion.

1971-07-01
By Mehling, Kevin D. ; Collins, William E. ; Schroeder, David J.

[PDF-738.64 KB]

English

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Details:

Creators:

Mehling, Kevin D. ; Collins, William E. ; Schroeder, David J.

Mehling, Kevin D. ; Collins, William E. ; Schroeder, David J. Less -
Corporate Creators:

Civil Aeromedical Institute
Corporate Contributors:

United States. Office of Aviation Medicine
Subject/TRT Terms:

[+]

Aircraft Air Pilots Airplanes Depth Depth Perception Distance Perception Distraction (Psychology) Experiments Eye--Examination Eye--Movements Eye Fixations Eye Location Eye Movements Human Beings--Testing Human Subject Testing Hypothesis Testing Mathematical Prediction Motion Motion Perception Motion Perception (Vision) Motor Ability Motor Reactions Motor Skills Optical Illusions Optical Properties Perception Pilots And Pilotage Prediction (Logic) Ratio Analysis Ratios Reaction Time Size Statistical Hypothesis Testing Statistics Stimulus Satiation Velocity Perception Vision Visual Perception
Publication/ Report Number:

FAA-AM-71-31 ; DOT/FAA/AM-71/31

FAA-AM-71-31 ; DOT/FAA/AM-71/31 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

OAM report.
Corporate Publisher:

Civil Aerospace Medical Institute
Abstract:

Many safety problems encountered in aviation have been attributed to visual illusions. One of the various types of visual illusions, that of apparent motion, includes as an aftereffect the apparent reversed motion of an object after it ceases real movement.

The study examined some effects of perceived size, perceived distance, and perceived stimulus speed on the persistence of illusory motion in the spiral aftereffect. Two major conditions were used: Size Constant: a 4-inch spiral was positioned to subtend visual angles of 1/2, 1, 2, 4, and 8 deg with seven rates of retinal speed (10-100 minarcs/sec) used at each angle; Angle Constant: three sizes of spirals were positioned so that each subtended visual angles of 2, 4, and 8 deg with physical speed held constant (75 rpm) in one case, and retinal speed (45 minarcs/sec) held constant in another. Durations of the illusion were significantly affected by low retinal speeds, by small visual angles, and by perceived size per unit of retinal size.

The results suggest that complex interactions of physical and perceptual factors can significantly alter the presence and the magnitudes of visual illusions of motion.
Format:

PDF
Collection(s):

FAA Civil Aerospace Medical Institute US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:14332f2cbd083e027deffa0cb7c8238986cef4fc230e1612d879a6f43faba334
Download URL:

https://rosap.ntl.bts.gov/view/dot/20968/dot_20968_DS1.pdf
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The spiral aftereffect : III, Some effects of perceived size, retinal size, and retinal speed on the duration of illusory motion.

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