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Contrast gain control in the lower vertebrate retinas [published erratum appears in J Gen Physiol 1995 Aug;106(2):following 388]

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Abstract

Control of contrast sensitivity was studied in two kinds of retina, that of the channel catfish and that of the kissing gourami. The former preparation is dominantly monochromatic and the latter is bichromatic. Various stimuli were used, namely a large field of light, a spot- annulus configuration and two overlapping stimuli of red and green. Recordings were made from horizontal, amacrine, and ganglion cells and the results were analyzed by means of Wiener's theory, in which the kernels are the contrast (incremental) sensitivity. Modulation responses from horizontal cells are linear, in that the waveform and amplitude of the first-order kernels are independent of the depth of modulation. In the N (sustained) amacrine and ganglion cells, contrast sensitivity was low for a large modulation input and was high for a small modulation input, providing an example of contrast gain control. In most of the cells, the contrast gain control did not affect the dynamics of the response because the waveform of the first-order kernels remained unchanged when the contrast sensitivity increased more than fivefold. The signature of the second-order kernels also remained unchanged over a wide range of modulation. The increase in the contrast sensitivity for the second-order component, as defined by the amplitude of the kernels, was much larger than for the first-order component. This observation suggests that the contrast gain control proceeded the generation of the second-order nonlinearity. An analysis of a cascade of the Wiener type shows that the control of contrast sensitivity in the proximal retinal cells could be modeled by assuming the presence of a simple (static) saturation nonlinearity. Such a nonlinearity must exist somewhere between the horizontal cells and the amacrine cells. The functional implications of the contrast gain control are as follows: (a) neurons in the proximal retina exhibit greater sensitivity to input of lower contrast; (b) saturation of a neuronal response can be prevented because of the lower sensitivity for an input with large contrast, and (c) over a large range of modulation depths, the amplitude of the response remains approximately constant

Topics: Articles
Publisher: The Rockefeller University Press
OAI identifier: oai:pubmedcentral.nih.gov:2216959
Provided by: PubMed Central
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    1. (1979). Adaptation in catfish retina.
    2. (1990). Bifurcation analysis of nonlinear retinal horizontal cell models. II. Network properties.
    3. (1985). Contrast gain control in the cat visual system.
    4. (1992). Contrast gain control in the primate retina: P cells are not X-like, some M cells are. Fisual Neuroscience.
    5. (1993). Contrast sensitivity and light adaptation in photoreceptor or in the retinal network.
    6. (1989). Dissection of the neuron network in the catfish inner retina. III. Interpretation of spike kernels.Journal of Neurophysiology.
    7. (1986). Dynamics of cockroach neurons.
    8. (1988). Dynamics of skate horizontal cells.
    9. (1987). Dynamics of the ganglion cell response in the catfish and frog retina.Journal of General Physiology.
    10. (1987). Dynamics of turtle cones.
    11. (1985). Dynamics of turtle horizontal cell response.
    12. (1981). How the contrast gain control modifies the frequency responses of cat retinal ganglion cells.
    13. (1973). Identification of biological cascades of linear and static nonlinear systems.
    14. (1975). Morphological and functional identifications of catfish retinal neurons.
    15. (1993). Multi-neuronal signals from the retina: Acquisition and analysis.
    16. (1988). Neuron network in catfish retina:
    17. (1990). Nonlinear System Analysis and Identification from Random Data.
    18. (1994). On the role of X and simple cells in human contrast processing. Vision Research.
    19. (1970). Physiological and morphological identification of horizontal, bipolar, and amacrine cells in goldfish retina.Journal of Physiology.
    20. (1966). S-potentials from luminosity units in the retina of fish (Cyprinidae).
    21. (1985). Signal transmission in the catfish retina. II. Transmission to type-N cell.Journal of Neurophysiology.
    22. (1987). Signal transmission in the catfish retina. IV. Transmission to ganglion cells.
    23. (1979). The contrast gain control of the cat retina. Vision Research.
    24. (1987). The dynamics of the cat retinal X cell centre.Journal of Physiology.
    25. (1988). The dynamics of the cat retinal Y cell subunit.Journal of Physiology.
    26. (1980). The effect of contrast on the nonlinear response of the Y cells.
    27. (1978). The effect of contrast on the transfer properties of cat retinal ganglion cells.J0urnal of Physiology.
    28. (1965). The Ferrier lecture: visual adaptation.
    29. (1968). Triggered correlation.
    30. (1984). Visual adaptation and retinal gain control.
    31. (1985). Visual sensitivity and Wiener kernels.
    32. (1973). Wiener's theory of nonlinear noise.

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