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Cumulative action potential AHP in tonic and phasic neurons. In A, the duration of the AHP (measured between arrows) following consecutive action potentials (4 stimuli, 2 ms, 3 nA steps, 50 Hz) in a phasic neuron is relatively longer compared with B, a tonic neuron (arrows). The calibration bars in B apply to traces A and B. Peak action potential amplitudes are cropped.
