Fig.3. Burst triggering by current injection. (A) Injection of a 5s depolarising pulse via the recording electrode (during the first half of an interburst interval) triggered a burst, which lasted 128s (end of burst not shown). (B) Following termination of a 500ms hyperpolarising pulse, a burst of action potentials, lasting 55s, occurred. The same hyperpolarising pulse and first six spikes (highlighted in the box) are shown on an expanded scale in (C). During the pulse, the membrane potential waveform does not follow that of the square wave hyperpolarisation (deviation from dashed line) and upon termination of the pulse, an action potential is immediately triggered. Succeeding this action potential, but prior to the onset of the next, is a depolarising after potential (DAP; arrow).
