Table 1.
Properties of EPL interneurons that produced prolonged spike trains in response to suprathreshold depolarizationa
| Soma major axis (μm) | 12.0±0.8 |
| Soma minor axis (μm) | 8.8±0.5 |
| Dendritic extent (μm)b | 146±14 |
| Resting potential (mV) | −78.5±1.4 |
| Spontaneous EPSP/C frequencyc | 134±13 |
| Input resistance (MΩ)d | 306±22 |
| Time constant (ms)d | 9.8±1.2 |
| Spike threshold (mV)e | −47.3±0.1 |
| Spike height (mV)e,f | 60.7±2.5 |
| Spike overshoot (mV)e,f | 13.6±2.7 |
| Spike width at half amplitude (ms)e,f | 0.25±0.02 |
| After-hyperpolarization amplitude (mV)e,g | −17.3±1.3 |
| After-hyperpolarization time-to-peak (ms)e,h | 1.2±0.1 |
| Latency of first evoked spike (ms)i | 184.9±39.6 |
| Evoked firing frequency (Hz)j | 156±11 |
| Coefficient of variationj,k | 0.09±0.05 |
Mean±S.E.M. for 10 interneurons (except dendritic extent n=4) that produced trains of ≥11 action potentials in response to depolarizing current steps.
Largest linear extent of the dendritic tree visible in single sections.
Measured during sporadic frequency increases.
Measured in responses to hyperpolarizing current pulses.
Measured during slow depolarization from the resting membrane potential.
Relative to the threshold voltage.
Minimum voltage.
From the action potential peak to the minimum voltage.
Measured in responses to near-threshold current pulses.
Measured in responses to suprathreshold current pulses evoking ≥11 action potentials.
S.D.÷mean of 10 inter-spike intervals (×1.025 to correct for small sample size; Sokal and Rohlf, 1981).