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. 2019 Nov 11;9:16460. doi: 10.1038/s41598-019-52965-1

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(A) Left panels show full NLC spectrum (0.39–7 kHz) surface plots as a function of postnatal age, illustrating the bell-shaped NLC and its roll-off with increasing frequency. Black dots indicate means and pink dots are +se, which sit atop the Boltzmann fits. The panels on the right show the same data top-down, and provide a clearer view of the frequency response changes during aging. (B) NLC_Vh for each age group is log-log plotted to more clearly show the low-pass behavior that changes during aging. The colored points were used for fitting in Fig. 5. For the 2 youngest groups grey lines show regions omitted from fits because of noise at high frequencies.