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Fig. 2 | SpringerPlus

Fig. 2

From: Preparatory brain activity and anticipatory postural adjustments accompanied by externally cued weighted-rapid arm rise task in non-specific chronic low back pain patients and healthy subjects

Fig. 2

Representative samples of contingent negative variation (CNV) waveforms were recorded from a single subject in each group and electrode location. (a) A healthy participant’s average CNV potentials at each electrode location including Fz (thick black trace), Pz (thick, gray trace) and Cz (thin black trace). (b) A LBP patient participant’s average CNV waveforms at each electrode location, which include Fz, Pz and Cz. S1 indicates auditory warning stimulus, and S2 denotes auditory imperative stimulus. The two thick solid lines illustrate the interstimulus interval (ISI), and the two spaces between right tick solid line and each thin solid line represent the 100 ms epoch preceding the imperative stimulus. According to the general agreement, upward deflections in the EEG signal are considered as negative potentials. Fz frontal, Cz central, Pz parietal midline channels, µV microvolt, and ms millisecond

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