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Subthreshold resonance in a motoneuron. A, Voltage response (average of 4 recordings, top trace) to a ZAP current (bottom trace) of constant amplitude (4 nA peak-to-peak) and increasing frequency (from 0 to 40 Hz; see Materials and Methods). B, Impedance computed as the ratio of the fast Fourier transforms of voltage and current. Peak at 12 Hz indicates the resonance (dashed line). Same motoneuron as in Figure 1.
