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. 2020 Jul 29;11:1256. doi: 10.3389/fpsyg.2020.01256

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Copyright © 2020 Morenilla, Márquez, Sánchez, Bello, López-Alonso, Fernández-Lago and Fernández-del-Olmo.

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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Task effect on cognitive performance. Changes appeared in cognitive task performance (mean values with standard error bars) from single-task conditions (cognitive task conducted by seated participants) to the dual-task with open eyes (for PD patients, *p = 0.039, and controls, **p = 0.009) and the dual-task with closed eyes. Differences were recorded between the groups in cognitive task performance in the dual-task with open eyes condition (**p < 0.01). PD, Parkinson’s disease; BL, cognitive baseline; DTOE, dual-task open eyes; DTCE, dual-task closed eyes.