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. 2011 Jul 27;12:73. doi: 10.1186/1471-2202-12-73

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Copyright ©2011 Witzel et al; 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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S1 Oscillatory Activity: (a) Post-stimulus time-frequency representations showed an early ~20-70 ms low-gamma (γ) ERS. This was followed by a prolonged ERD in alpha (α) and beta (β) power at ~100-300 ms post-stimulus. There was a simultaneous theta (θ) ERS at ~50-200 ms. (b) Beta ERD at 100-300 ms was calculated for each minute of stimulation and demonstrated a trend for decrease over the course of EA stimulation. Similar calculations were made for other frequency bands but did not show significance at the same p < 0.01 level.