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. 2019 Jul 25;13:34. doi: 10.3389/fnint.2019.00034

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Copyright © 2019 De Stefano, Schmitt, White, Mosconi, Sweeney and Ethridge.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Two PCA components each were generated for children (A) and adults (B), with the component accounting for the most variance in red and the second most in black. The entire time series is on the left; a closer look at the first 400 ms is on the right. Child-like and adult-like auditory topographies were assigned based on the lack of a visible N1 (seen in adult-like topography, but not child-like). Representative scalp topographies, below, were taken from the height of the N1 response in adult-like topography (170 ms). Topographies from component 1 are in red; component 2 are in black. (C) The stimulus is a two-second long amplitude-modulated tone.