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Representative neurogram (first row) and ECG tracing (second row) during baseline and skin afferent stimulation. Arrow denotes a spontaneous baseline burst, and squares represent light (open squares), moderate (shaded squares), and firm (solid squares) rhythmical brush strokes with a calligraphy brush within the area of innervation of the supraorbital nerve. Note that bursts are not related to ECG r waves, and cutaneous mechanoreceptor activation is related to amplitude.
