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. 2017 Jan 9;10:649. doi: 10.3389/fnhum.2016.00649

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Copyright © 2017 Muralidharan, Balasubramani, Chakravarthy, Gilat, Lewis and Moustafa.

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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The frequency distributions of step latency observed from the model for the PD non-freezers (A) and the PD freezers where ^* represents the modal points (B). Motor arrests seen in PD freezers and non-freezers under low and high levels of cognitive load in experiments (C) and the model (D). The PD freezers (OFF) show a large number of motor arrests, which comes down under medicated conditions. PD non-freezers show no significant changes in the both the loads as well as the medication. (Abbreviation NFR, Non-freezer; FR, Freezer) (^##p < 0.05).