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Fig. 5. Firing rates as a function of time for nine primary afferent (PA) fibers (A) and nine dorsal octavolateral nucleus (DON) units (B) during stimulation with a moving DC field (top nine traces); the lowest trace in each panel is the average. Traces are aligned by the receptive field position to allow averaging. The x-axis zero point marks the center of the receptive field. The speed of the DC stimulus was 5 cm s-1. Response amplitude and shape were similar for PA fibers and DON units.