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  Indian J Med Microbiol
 

Figure 1: Average (N = 19) brain responses to nonpainful tactile stimulations in NREM sleep. The left panel indicates left hemisphere central (C3) responses whereas the right panel corresponds to C4 (right central region). The recordings are provided from central electrode sites on the scalp. The brain responses to right hand somatosensory stimulations are labeled as SEP-R (orange color) and hence the left as SEP-L (green color). The horizontal axis denotes time in ms, ranging from 1000 ms prestimulus to 2000 ms poststimulus (“-” value represents before the stimulus onset). The dashed vertical line represents the time point of stimulation. The vertical axis denotes amplitude (in μV, the reference marker points to the amplitude as in 2.5 μV scale) as positive values are given as the upper direction. In the left panel, appropriate labels are added in respective time windows as P50, N100, P200, N300, P450, N550, P900, and N_late. The P stands for positive and N for negative deflection

Figure 1: Average (<i>N</i> = 19) brain responses to nonpainful tactile stimulations in NREM sleep. The left panel indicates left hemisphere central (C3) responses whereas the right panel corresponds to C4 (right central region). The recordings are provided from central electrode sites on the scalp. The brain responses to right hand somatosensory stimulations are labeled as SEP-R (orange color) and hence the left as SEP-L (green color). The horizontal axis denotes time in ms, ranging from 1000 ms prestimulus to 2000 ms poststimulus (“-” value represents before the stimulus onset). The dashed vertical line represents the time point of stimulation. The vertical axis denotes amplitude (in μV, the reference marker points to the amplitude as in 2.5 μV scale) as positive values are given as the upper direction. In the left panel, appropriate labels are added in respective time windows as P50, N100, P200, N300, P450, N550, P900, and N_late. The P stands for positive and N for negative deflection