Figure 6
From: An EEG-based study of discrete isometric and isotonic human lower limb muscle contractions
Grand average normalized spectrograms for (top row) supplementary motor area, (second row) left dorsal premotor area, (third row) right dorsal premotor area, (fourth row) posterior cingulate, and (fifth row) posterior parietal cortex showing average changes in spectral power during the task relative to a −1000 ms to −500 ms baseline for isometric (left) and isotonic (right) trials. The color of the border and the numeric label for each row corresponds to the color and numeric label of the dipoles for the corresponding cluster shown in Figure 3. The horizontal axis begins 1 s prior to trial onset (To; first black vertical line) and ends 1 s after trial offset (Tf; second black vertical line). The times between the onset and offset of the trials were warped to align these latencies across all trials. Non-significant changes from baseline (p > 0.05) were set to 0 dB (green).