What causes the characteristic curve of photoreceptors?

Discussion in 'Optometry Archives' started by Marc Wossner, Jan 8, 2008.

  1. Marc Wossner

    Marc Wossner Guest

    dear ng,

    can someone help me with the following: What is the characteristic
    curve of our rod and cone photoreceptors determined by? I found some
    plots of in vivo measurings of cone receptor potentials that show a
    clear s-form (http://www.handprint.com/HP/WCL/color4.html#lightadapt,
    scroll down a bit). That is a kind of toe in the lower part, a linear
    section in the middle and a kind of shoulder in the upper part. So
    luminance differences are compressed in the toe and in the shoulder
    but rendered 1:1 in the middle. Is this caused by a kind of nonlinear
    response to light alone or do other neurophysiological mechanisms,
    like lateral inhibition, play a role as well?

    Many thanks for your input!
    Marc Wossner, Jan 8, 2008
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