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Front-end filter (L1) shifts from low-pass to band-pass characteristics with exposure.

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posted on 11.07.2016, 16:12 by Eva R. M. Joosten, Shihab A. Shamma, Christian Lorenzi, Peter Neri



1 estimates as in Fig 3B, separately for ‘early’ (green) and ‘late’ (black) phases of the data collection epochs (see Materials and Methods). Inset curves show the corresponding low-pass (early) and band-pass (late) power spectra of the two


1 estimates. (B) Quantifying the shift from low-pass to band-pass shapes of the


1 filter. The spectral centroid (y axis) is plotted against the Q estimates using the same symbols as in Fig 4. Ovals are aligned with best-fit line, with radii matched to SD’s for data projected parallel and orthogonal to line. (C) Distribution of late/early log-ratios for centroid values. (D) Distribution of late/early comparisons for all three band-pass metrics (Q, AC/DC energy log-ratio, spectral slope). (E) Gradual change in the spectral centroids in 10 successive epochs during the experiments (rather than just early/late); orange shading reflects task-relevant stimulus modulations across centroid values in the bandpass region (see Materials and Methods and S5I Fig for a full plot of these modulations spanning the low frequency region). Solid line shows semi-log linear fit (thin lines plot boundaries ±1 SEM around fit parameters). Associated correlation coefficient (centroid drift) is plotted separately for each subject in (F). Error bars/margins plot ±1 SEM in (A-B, E); ±95% confidence intervals in (F).