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Figure 8. . Power spectral density of Xenopus rod single-photon responses in control conditions and when intracellular Ca2+ changes were buffered with BAPTA-AM. (A) Population average power spectra were computed from single-photon responses of froglet (squares) and tadpole (circles) rods in control solution and froglet (upward triangle) and tadpole (downward triangle) rods loaded with BAPTA-AM. Data were fit with piecewise-linear approximations. Arrows indicate approximate cutoff frequencies. Under both conditions, the tadpole rod spectra overlap closely over the entire frequency range. Above 0.3 Hz, the froglet rod spectra obtained in control and BAPTA-containing conditions also overlap one another. However, <0.3 Hz the spectrum of the BAPTA-loaded rods continues to gain power, while the control froglet spectrum diverges to superimpose on the low frequency power density of the froglet responses <∼0.15 Hz. (B) Population average power spectra of single photon responses were normalized relative to the square of their respective saturating current values. Spectra of tadpole rods (control and BAPTA) and froglet rod responses with BAPTA overlap closely. The spectrum of control froglet rod responses has lower power levels at frequencies <0.15 Hz. Data fit with model predictions (see appendix). 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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