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. 2016 Jun 22;10:125. doi: 10.3389/fnbeh.2016.00125

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Copyright © 2016 Wheeler, Fulton, Gaudette, Simmons, Matsuo and Simmons.

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) or licensor 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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Distributions of IPIs and IPI ratios. Proportion of IPIs (top panel) and post IPI/pre IPI ratios (bottom panel) by corridor width. IPIs and ratios are plotted on logarithmic x-axes to emphasize differences at the extreme low end of the IPI and ratio ranges. The 40 cm curve (green) shows drastically higher proportions of sounds having 20 ms IPIs (top panel) than in the other corridor widths. Similarly, the 40 cm curve for the ratios shows a shift toward smaller ratio values in comparison to the other widths.