English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  An examination of physiological mechanisms underlying the frequency-doubling illusion

White, A. J. R., Sun, H., Swanson, W. H., & Lee, B. B. (2002). An examination of physiological mechanisms underlying the frequency-doubling illusion. Investigative Ophthalmology and Visual Science, 43(11), 3590-3599. Retrieved from http://www.iovs.org/cgi/reprint/43/11/3590.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
White, A. J. R., Author
Sun, H., Author
Swanson, W. H., Author
Lee, B. B.1, Author           
Affiliations:
1Abteilung Neurobiologie, MPI for biophysical chemistry, Max Planck Society, ou_578620              

Content

show
hide
Free keywords: -
 Abstract: PURPOSE. The frequency-doubling illusion is an apparent doubling of spatial frequency when a sinusoidal grating is modulated rapidly in temporal counterphase. It has been proposed that the illusion arises from a spatially nonlinear ganglion cell class. The current study reexamines this possibility and investigates other mechanisms that may underlie the illusion. METHODS. Responses of macaque magnocellular (MC) retinal ganglion cells were recorded to counterphase-modulated sinusoidal gratings of various spatial frequencies, and linearity of spatial summation was assessed. Human psychophysical thresholds were measured for a variety of phase discrimination and matching tasks. RESULTS. Consistent with lateral geniculate recordings reported by other authors, no evidence was found of a separate nonlinear (M-y) MC cell class. The small, spatially nonlinear responses found were least at the low spatial frequencies used in clinical testing. Further analysis showed that no spatially modulated signal can be expected from the nonlinear response of a ganglion cell; the nonlinearity of spatial summation gives a doubled response in time but not across space. Psychophysical performance was consistent with an inability to distinguish the temporal phase of counterphase-modulated gratings when the illusion occurs. From 4 to 40 Hz, the zero-crossings of the modulated sinusoidal grating provided a spatial cue and were matched to comparison patterns at twice the stimulus spatial frequency. CONCLUSIONS. These results are inconsistent with the hypothesis that spatially nonlinear (M-y) retinal ganglion cells are the physiological substrate of the frequency-doubling illusion. A cortical loss of temporal phase discrimination may be the principle cause of the illusion.

Details

show
hide
Language(s): eng - English
 Dates: 2002-11
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 16682
URI: http://www.iovs.org/cgi/reprint/43/11/3590
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Investigative Ophthalmology and Visual Science
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 43 (11) Sequence Number: - Start / End Page: 3590 - 3599 Identifier: -