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. 2012 Mar 14;13:27. doi: 10.1186/1471-2202-13-27

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Copyright ©2012 Master and Tremblay; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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EMG activity during grating and smooth trials in young and older adults. Muscle activation pattern elicited in the right FDI in Experiment I during task execution in young (A) and older (B) adults. The traces represent the overall mean (± SD) of all participants' rectified electromyographic (EMG) activity level in each age group (n = 16) recorded prior to application of TMS pulse over the left primary motor cortex, normalized as a percentage of each participant's MVC, for all grating (n = 12) and smooth (n = 12) trials. Note the close similarity in the pattern of muscular activation between the two types of trials, and in both age groups.