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. 2019 Apr 26;6(2):ENEURO.0483-18.2019. doi: 10.1523/ENEURO.0483-18.2019

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Copyright © 2019 Wang et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license, which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.

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Figure 5. — Alpha-ERD as a neural response to magnetic field rotation. Post-stimulus power changes (dB) from a pre-stimulus baseline (−500 to −250 ms) plotted according to the ±3-dB color bar at bottom. A, Scalp topography of the alpha-ERD response in an inclination experiment, showing alpha-power at select time points before and after field rotation at 0 s. Alpha-ERD (deep blue) was observed in SWEEP (top row), but not FIXED (bottom row), trials. B, Scalp topography of the alpha-ERD response for two runs of the declination experiment, tested six months apart in a different strongly-responding participant. DecDn.CCW.N condition is shown. In both runs, the response peaked around +500 ms post-stimulus and was widespread over frontal/central electrodes, demonstrating a stable and reproducible response pattern. C, Time-frequency maps at electrode Fz for the same runs shown in B. Black vertical lines indicate the 0- to 100-ms field rotation interval. Pink/white outlines indicate significant alpha-ERD at the p < 0.05 and p < 0.01 statistical thresholds, respectively. Separate runs shown side by side. Significant alpha-ERD was observed following downwards-directed counterclockwise rotations (outlines in top row) with no other power changes reaching significance. Significant power changes appear with similar timing and bandwidth, while activity outside the alpha-ERD response and activity in other conditions is inconsistent across runs.