Speed discrimination under stabilized and normal viewing conditions

To determine whether speed discrimination improves when the retinal image is stabilized against the effects of eye movements, thresholds were measured under stabilized and normal viewing conditions. In the normal viewing conditions, eye movements were recorded and used to estimate retinal-image spee...

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Bibliographic Details
Published inVision research (Oxford) Vol. 36; no. 12; pp. 1819 - 1825
Main Authors Heidenreich, Susan M., Turano, Kathleen A.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.06.1996
Elsevier Science
Subjects
Anatomical correlates of behavior
Behavioral psychophysiology
Biological and medical sciences
Differential Threshold - physiology
Discrimination (Psychology) - physiology
Eye Movements
Female
Fundamental and applied biological sciences. Psychology
Humans
Motion Perception - physiology
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychophysics
Space life sciences
Speed discrimination
Stabilized viewing
Time Factors
Stabilized viewing
Speed discrimination
Eye movements
Human
Stimulus movement
Stabilization
Perception threshold
Differential threshold
Retina
Psychophysics
Eye movement
Eye
Visual system
Visual stimulus
Vision
Stimulus velocity
Perception
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Summary:To determine whether speed discrimination improves when the retinal image is stabilized against the effects of eye movements, thresholds were measured under stabilized and normal viewing conditions. In the normal viewing conditions, eye movements were recorded and used to estimate retinal-image speeds. Stimulus reference speed for sinusoidal gratings varied from 0.5 to 8.0 deg/sec/ Results showed that speed discrimination thresholds, expressed as Weber ratios, decreased with increasing stimulus speed for both the normal and stabilized viewing conditions. Stabilized viewing thresholds were higher than normal viewing thresholds only at the slowest stimulus reference speed. However, when speed discrimination thresholds were expressed as a function of the estimated retinal speed, there was no difference in thresholds for the stabilized and normal viewing conditions. A retinal-image model, whereby speed discrimination depends on retinal-image motion, explains the results.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0042-6989
1878-5646
DOI:10.1016/0042-6989(95)00270-7