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. 2015 Jun 23;7:97. doi: 10.3389/fnagi.2015.00097

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Copyright © 2015 Wiesmeier, Dalin and Maurer.

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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Parameters of perturbed stance. (A) GAIN, (B) GAINFACTOR, (C) PHASE, (D) LAGPHASE of the three age groups across all stimulus amplitudes and visual conditions. GAINFACTOR is the percental quotient between the GAIN of the middle-aged and elderly group and the young group as a comparison group. The time difference between PHASE of the middle-aged and elderly group and the young group as a comparison group is named LAGPHASE. Its unit is degrees (°).