Biology:Frequency-doubling illusion
The frequency-doubling illusion is an apparent doubling of spatial frequency when a sinusoidal grating is modulated rapidly in temporal counterphase.[1][2] Recently, it has been proposed that the illusion arises from a spatially nonlinear ganglion cell class.[3] The contrast threshold values needed for perceiving this physiological effect are used in frequency doubling technology perimetry for the detection of even early phases of glaucoma.[4][5][6]
A more recent study's results argue against the hypothesis that spatially nonlinear retinal ganglion cells are the physiological substrate of the frequency-doubling illusion. A cortical pathway of temporal phase discrimination may be the principal cause of the illusion, whereas spatial phase information (i.e., grating position) is retained.[7]
Sensitivity to the spatial-frequency-doubling illusion was also positively correlated with reading lag and coherent motion. The results provide good support for a magno deficit in dyslexia that has its origins at a retinal level with impairment in—at least partially—M(y)-cell activity.[8]
References
- ↑ Kelly, D.H. (1981) Nonlinear visual responses to flickering sinusoidal gratings. Journal of the Optical Society of America, 71, 1051-1055
- ↑ Sun, H., Lee, B. B., White, A. J. R., Swanson, W. H., (2002). Examination of mechanisms underlying the frequency-doubling illusion. Journal of Vision, Volume 2, Number 10, Abstract 9, Page 9a
- ↑ Maddess, T., Goldberg, I., Dobinson, J., Wine, S., Welsh, A.H. & James, A.C. (1999). Testing for glaucoma with the spatial frequency doubling illusion. Vision Research, 39, 4258-4273.g
- ↑ Cello, K.E., Nelson-Quigg, J.M. & Johnson, C.A. (2000). Frequency doubling technology perimetry for detection of glaucomatous field loss. American Journal of Ophthalmology, 129, 314-322
- ↑ Quigley, H.A. (1998). Identification of glaucoma-related visual field abnormality with the screening protocol of frequency doubling technology. American Journal of Ophthalmology, 125, 819-829
- ↑ Burnstein, Y., Ellish, N.J., Magbalon, M. & Higginbotham, E.J. (2000). Comparison of frequency doubling perimetry with humphrey visual field analysis in a glaucoma practice. American Journal of Ophthalmology, 129, 328-333
- ↑ Sun, H., Lee, B. B., White, A. J. R., Swanson, W. H., (2002).Examination of mechanisms underlying the frequency-doubling illusion. Journal of Vision, Volume 2, Number 10, Abstract 9, Page 9a
- ↑ Pammer, K (2001). "Perception ECVP abstract". http://www.perceptionweb.com/abstract.cgi?id=v010241.
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