Nonlinear transfer of signal and noise correlations in vivo. Nonlinear transfer of signal and noise correlations in vivo.A, The spectrogram of sound with random FMs. See Materials and Methods for a detailed description of sound properties. B, Example membrane potential and spiking responses of a typical neuron in gerbil A1 across trials for the same FM sound with two different sound SNRs. Action potentials were clipped for plotting. C, The output signal correlations (left) and output noise correlations (right) as a function of input SNR for the pair formed from the responses of a typical neuron to FM sounds with four different SNRs, along with the best linear fits. The input SNR for a pair of responses was computed as the geometric mean of the SNRs for each response. The error bars indicate the SDs of the distributions obtained from bootstrap resampling of trials. D, The best linear fits between input SNR and output signal correlation (left) and output noise correlation (right) for all intracellular recordings in our sample. E, F, Results for extracellular recordings plotted as in C and D, with input SNR replaced by output SNR. G, The output noise correlation as a function of the input signal correlation for the pair formed from the responses of a typical neuron to FM sounds with different signal components, along with the best linear fit. H, The best linear fits between input signal correlation and output noise correlation for all pairs in our sample. I, J, Results for extracellular recordings plotted as in G and H, with input signal correlation replaced by output signal correlation. Dmitry R. Lyamzin et al. J. Neurosci. 2015;35:8065-8080 ©2015 by Society for Neuroscience