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Figure 9. . Measured and predicted power spectral densities of Xenopus rod single-photon responses. Power spectra of froglet rod responses with BAPTA (triangles) and under control conditions (squares) are compared with predictions from a linear model. Three parameters in the feedback stage of the model were varied independently to determine their influence on the shape of the spectrum. (A) the gain (Hf); (B) the cutoff frequency (βf); and (C) the buffering capacity (ΔBCa), which is inversely related to both gain and cutoff frequency of the feedback loop (Eqs. A3–A5). Values assigned to the model parameters are indicated along with the respective functions. Image published in: Solessio E et al. (2004) Copyright © 2004, The Rockefeller University Press. This image is reproduced with permission of the journal and the copyright holder. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike license Larger Image Printer Friendly View

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