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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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Ratio of Post IPI to Pre IPI. (A) Frequency of post/pre-IPI ratios in the 100 cm (top panel), 70 cm (middle panel), and 40 cm (bottom panel) corridor widths. Peaks of bimodal distributions are ratios of ~0.7 and ~1.5. Vertical line marks a ratio of 1 (where pre IPI = post IPI). (B) Percent distribution of post-IPI to pre-IPI ratios across all corridor widths with a lognormal curve overlay. (C) Same plot as in (B) with x-axis showing log-transformed IPI ratios revealed a bimodal distribution.