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. Author manuscript; available in PMC: 2014 May 1.
Published in final edited form as: Nat Neurosci. 2013 Oct 6;16(11):1692–1700. doi: 10.1038/nn.3534

Figure 1. Temporal components of cone outer segment noise.

Figure 1

a. Cone current responses to 10 ms flashes producing ~50 opsin activations (R*) delivered on a 5000 R*/s background (black traces). The mean of ~50 responses is at the bottom, fitted (red) with Equation 6 with the following parameters: α = 0.1993, τrise = 20.2 ms, τdecay = 75.6 ms, τosc = 397.1 ms and ϕ = −79.5 degrees. Current recorded in bright light is at the top (gray trace).

b. Power spectra of noise in constant and bright light from cone in (a).

c. Power spectrum of the outer segment cone noise (black circles, noise in background minus that in saturating light from b) and fit (red trace) obtained by summing a scaled version of the power spectrum of the fitted average dim flash response and two Lorentzian functions (Equation 5) with distinct corner frequencies (18 Hz and 170 Hz) (black lines).

d. Average outer segment cone noise measured at 5000 R*/s (n=6, black circles, mean ± SEM) and fit as in (c) (red trace). Corner frequencies of Lorentzian functions are 24 Hz and 200 Hz.

e. Average outer segment cone noise measured in darkness from foveal cones (n = 7, black circles, mean ± SEM) and fit as in (c) (red trace). Corner frequencies of Lorentzian functions are 10 Hz and 150 Hz.