Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Time thresholds for increments and decrements in luminance.

W H Ehrenstein, L Spillmann

    Journal of the Optical Society of America
    |April 1, 1983
    PubMed
    Summary

    Detecting light changes requires minimal durations. Time thresholds for light increments and decrements varied based on stimulus type, background luminance, and retinal position, with decrements sometimes needing longer detection times.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Stroke-blind for colors, faces and locations: Partial recovery after three years.

    Restorative neurology and neuroscience·2012
    Same author

    Past trials influence perception of ambiguous motion quartets through pattern completion.

    Proceedings of the National Academy of Sciences of the United States of America·2005
    Same author

    Filling-in of the foveal blue scotoma.

    Vision research·2001
    Same author

    Texture fading correlates with stimulus salience.

    Vision research·2001
    Same author

    Surface color from boundaries: a new 'watercolor' illusion.

    Vision research·2001
    Same author

    Spatial coordinates of human auditory working memory.

    Brain research. Cognitive brain research·2001

    Area of Science:

    • Visual perception
    • Photoreceptor physiology

    Background:

    • Understanding visual detection thresholds is crucial for visual science.
    • Minimal durations for light change detection (time thresholds) are influenced by various visual parameters.

    Purpose of the Study:

    • To measure time thresholds for light increments and decrements under different conditions.
    • To investigate the influence of background luminance, retinal eccentricity, and stimulus type on these thresholds.

    Main Methods:

    • Measured time thresholds for a 1-degree test spot on a 20-degree background.
    • Varied background luminance (-1 to 3 log td) and retinal eccentricity (0 to 50 degrees).
    • Utilized two stimulus types (A and B) with varying step sizes (0.04 to 1.5 log units).

    Main Results:

    • Type A stimulation showed similar time thresholds for increments and decrements.
    • Type B stimulation revealed longer decrement thresholds than increment thresholds under specific conditions (larger step size, lower luminance, higher eccentricity).
    • Decrement thresholds exceeded increment thresholds by up to 80 msec in Type B.

    Conclusions:

    • Photoreceptor response rise/fall times and Troxler's effect contribute to differences in increment/decrement time thresholds.
    • Stimulus presentation method significantly impacts the perception of light changes.
    • Visual system exhibits asymmetric responses to light increments and decrements under certain parameters.

    Related Experiment Videos