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. 2020 Mar 11;12(5):4617–4640. doi: 10.18632/aging.102925

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Copyright © 2020 Hehl et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY 3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Visualization of the cortical motor representation parameters: area, volume, and maximal motor evoked potential (MAXMEP). Area was measured in cm² by calculating the area of a polygon expanding over all active points. Volume was measured in μV*cm² and defined as the sum of the mean motor evoked potential (MEP) peak-to-peak amplitudes of all active points, serving as an approximation of the three-dimensional integration of the map. The maximal mean MEP value of all active points was obtained as MAXMEP and measured in μV.