Fig. 2. Schematic representation of the hemisectioning site and recording sites for neurons located rostrally (10–15 mm) and caudally (10–20 mm) to the lesion ( A ). Patterns of spontaneous activity in “unclassified” neurons rostral and caudal to the spinal cord injury (SCI) site ( B - D ). The firing rates (upper panels) and raw spike examples are shown. B , a constant pattern of spontaneous activity with relatively constant high frequencies. C , a bursting pattern of spontaneous activity with a relatively short decreasing period. D , a bursting pattern of spontaneous activity with a relatively long silent period. Two of the 15 neurons located rostral to the lesion showed a “C” pattern of spontaneous activity and two neurons showed a “D” pattern of spontaneous activity. The other neurons located rostral to the lesion and all of the neurons located caudal to the lesion showed a “B” pattern of spontaneous activity.