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Vadim V. Nikulin, Dubravko Kičić, Seppo Kähkönen and Risto J. Ilmoniemi (2003) Modulation of electroencephalographic responses to transcranial magnetic stimulation: evidence for changes in cortical excitability related to movement. J. Neurosci., 18, 1206–1212.

Owing to problems in the reproduction of Figs 2–5 in this paper, we present the correct versions here. [Figs 2 and 5 have a µV calibration and the scales on the vertical axes of Figs 2–5 are correctly aligned.] We apologise for any inconvenience caused.

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Figure 2. EEG responses to TMS in one subject. (A) Averaged responses evoked by TMS alone arranged according to the layout of the electrodes (the view is from the top of the head, nose pointing upward). Note the prominent negativity (N100) following TMS. The shaded areas show the electrode sites used for the analysis. The dot shows the centre of the figure-eight coil. (B) EEG responses averaged across ten channels in the left and right hemispheres for different stimuli and conditions. Upper row: movement condition. Lower row: no-movement condition. Black line: EEG responses to TMS alone. Grey line: subtraction of the responses to visual stimuli from the responses to visual stimuli + TMS.

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Figure 3. Amplitude and latency of the N100 component in the left (A) and right hemispheres (B). Black bars: EEG responses to TMS alone. Grey bars: subtraction of the responses to visual stimuli from the responses to visual stimuli + TMS. Asterisks mark a significant drop of the N100 amplitude and an increase in the N100 latency.

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Figure 4. Amplitude of selectively averaged N100. (A) EEG epochs averaged with respect to the latency of the movement (fast and slow responses). Black bars: EEG responses to TMS alone. Grey bars: subtraction of the responses to visual stimuli from the responses to visual stimuli + TMS. Asterisks indicate significant drop of N100 amplitude for both groups. (B) EEG epochs averaged with respect to the amplitude of MEPs (small and large MEPs).

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Figure 5. EEG responses to TMS and control stimuli in one subject. The traces represent EEG activity averaged across ten channels in each hemisphere (see Fig. 1). Solid line: responses to TMS. Grey line: responses to acoustic click. Dotted line: responses to combined acoustic and peripheral somatosensory stimulation.

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