Nonlinear visual responses to flickering sinusoidal gratings
JOSA, Vol. 71, Issue 9, pp. 1051-1055 (1981)
http://dx.doi.org/10.1364/JOSA.71.001051
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Abstract
Over a range of high temporal and low spatial frequencies, counterphase flickering gratings evoke the so-called frequency-doubling illusion, in which the apparent brightness of the grating varies at twice its real spatial frequency. The form of the nonlinearity that causes this second-harmonic distortion of the visual response was determined by a cancellation technique. The harmonic distortion can be measured as a function of amplitude (or contrast) by adding to the flickering grating a real, nonflickering, double-frequency component with the amplitude and phase required to cancel the illusory second harmonic. Harmonic distortion curves obtained in this way imply that the nonlinearity is of the form |<i>s</i>| <sup><i>P</i></sup>, where <i>s</i> is the stimulus pattern (without its d<i>c</i> component) and <i>p</i> is close to 0.6. If <i>p</i> = 1, or if the absolute value is not taken, this expression predicts distortion curves that differ significantly from the experimental results. Hence neither rectification nor compression alone is sufficient to account for the second-harmonic distortion; both are required.
© 1981 Optical Society of America
Citation
D. H. Kelly, "Nonlinear visual responses to flickering sinusoidal gratings," J. Opt. Soc. Am. 71, 1051-1055 (1981)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-71-9-1051
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References
- D. H. Kelly, "Frequency doubling in visual responses," J. Opt. Soc. Am. 56, 1628–1633 (1966).
- C. A. Burbeck and D. H. Kelly, "Retinal mechanisms inferred from measurements of threshold sensitivity versus suprathreshold orthogonal mask contrast," in Proceedings of Topical Meeting on Recent Advances in Vision (Optical Society of America, Washington, D.C., 1980), paper ThB4.
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- See, for example, I. S. Gradshteyn and I. M. Ryzhik, Tables of Integrals, Series and Products (Academic, New York, 1965). This integral is evaluated on p. 372 (Formula 3.631-9) in terms of the beta function B, where B(x, y) = [Γ(x)Γ(y)]/Γ(x + y).
- Regardless of the form of the nonlinearity, its odd part can create only odd harmonics and therefore can have no effect on the second harmonic. Conversely, the even part of the nonlinearity can create only even harmonics and therefore can have no effect on the fundamental. Thus, even if these two frequency components are responses of the same nonlinear transducer, they represent separate, independent, additive aspects of its behavior. This is true for any transducer function that can he expanded in a Taylor series, and it does not depend on the phase of the stimulus. It follows from the fact that odd powers of a sinusoidal input (sin^{2n-1} θ and cos^{2n-l} θ) can always be expressed as a (finite) sum of odd harmonic terms, sin(2n - 2k - 1)θ and cos(2n - 2k - 1)θ, while even powers (sin^{2n} θ and cos^{2n} θ) can be expressed as a sum of even harmonic terms, in the latter case always of the form cos 2(n - k)θ, where K ranges from 0 to n - 1. See Ref. 10, pp. 25, 26.
- D. H. Kelly, "Visual nonlinearity measurement," J. Opt. Soc. Am. 71, 368A (1981).
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