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

Illusory contours and linear filters

B C Skottun

    Experimental Brain Research
    |January 1, 1994
    PubMed
    Summary
    This summary is machine-generated.

    Illusory contours, like borders between gratings, can be explained by linear filtering. This study shows Fourier analysis of these patterns reveals stimuli that can activate neurons via linear filtering mechanisms.

    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

    On using isoluminant stimuli to separate magno- and parvocellular responses in psychophysical experiments-a few words of caution.

    Behavior research methods·2013
    Same author

    The possible relationship between visual deficits and dyslexia: examination of a critical assumption.

    Journal of learning disabilities·2004
    Same author

    On the use of the Ternus test to assess magnocellular function.

    Perception·2002
    Same author

    On the use of metacontrast to assess magnocellular function in dyslexic readers.

    Perception & psychophysics·2002
    Same author

    The ability of inferior colliculus neurons to signal differences in interaural delay.

    Proceedings of the National Academy of Sciences of the United States of America·2001
    Same author

    Is dyslexia caused by a visual deficit?

    Vision research·2001

    Area of Science:

    • Neuroscience
    • Computational Vision
    • Visual Perception

    Background:

    • Illusory contours, perceived borders between abutting gratings, lack direct Fourier energy.
    • Neuronal responses to illusory contours challenge linear filtering models.
    • Previous research suggests non-linear processes underlie illusory contour perception.

    Purpose of the Study:

    • To investigate whether linear filtering can explain neuronal responses to illusory contours.
    • To test the hypothesis that stimuli creating illusory contours are incompatible with linear filtering.
    • To analyze the Fourier spectrum of abutting gratings and their interaction with neural filters.

    Main Methods:

    • Fourier analysis of abutting grating patterns.
    • Application of spatial and temporal filters mimicking cortical neuron properties.

    Related Experiment Videos

  • Simulation of neuronal stimulation based on filtered Fourier spectra.

    • Main Results:

    • The Fourier spectrum of abutting gratings contains amplitude distributions that can stimulate neurons via linear filtering.
    • Neuronal stimulation can be maximal when the illusory contour aligns with optimal orientations for bars.
    • Stimulation decreases symmetrically on either side of the optimal orientation for the illusory contour.

    Conclusions:

    • Neuronal responses to illusory contours are compatible with linear filtering mechanisms.
    • The Fourier spectrum properties of illusory contour stimuli support a linear filtering explanation.
    • This finding challenges the notion that only non-linear processes can account for illusory contour perception.