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Comparison of the action potential and the associated mechanical events triggered by a single electrical stimulus (500 μs) delivered to the infundibular stalk. Simultaneous recordings of the action potential (−ΔF, green trace) and the mechanical spike and dip (ΔZ, red trace) evoked in the same preparation. The thin black traces represent 10-point binomial smoothing of the data. Both traces were sampled at 20 kHz and low-pass filtered at 7 kHz.
