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Phase plane techniques have been used to demonstrate that identifiable neurones of Lymnaea stagnalis may be characterized by their action potential trajectories. These trajectories are consistent from preparation to preparation, but may be altered by strong synaptic inputs or by injection of current into neurones. There is a pronounced hysteresis in the maximum rates of depolarization and the maximum rates of repolarization of many cells following a period of hyperpolarization. Curves relatingdoi:10.1242/jeb.99.1.207 fatcat:gvy3nyl57rb3pjrau3srzrupei