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. Author manuscript; available in PMC: 2010 Jan 22.
Published in final edited form as: Neuroscience. 2007 Apr 6;146(3):931–945. doi: 10.1016/j.neuroscience.2007.02.047

Table 2.

Comparison of intrinsic membrane properties amongst slow firing MS/DB neurons in Clusters I, II, and III.

Neuronal Clusters Statistic
Membrane Properties I n=33 II n=10 III n=17 ANOVA Tukey’s Post Hoc
F p I vs II I vs III II vs III
RMP (mV) −72.41± 2.84 −67.40 ± 3.61 −69.06 ± 3.02 0.586 0.560 - - -
RM (mOhm) 41.80 ± 2.26 34.87 ± 5.28 39.05 ± 3.37 0.995 0.376 - - -
τm (ms) 31.45 ± 2.59 33.53 ± 4.79 40.39 ± 3.84 1.945 0.152 - - -
AP (mV) 83.00 ± 2.63 83.11± 3.97 93.38 ± 4.19 2.742 0.073 - - -
AP threshold (mV) −55.08 ± 1.49 −46.14 ± 2.47 −53.50 ± 1.41 1.851 0.166 - - -
AP latency (ms)* 66.12 ± 6.23 246.47 ± 20.11 84.06 ± 15.44 51.42 < 0.001 < 0.001 - < 0.001
AP half width (ms)* 2.33 ± 0.15 2.43 ± 0.29 1.7 ± 0.19 5.707 0.006 - 0.008 0.027
AP rise slope (mV/ms)* 58.53 ± 9.41 51.36 ± 4.48 78.98 ± 11.36 22.07 < 0.001 - < 0.001 < 0.001
AP decay slope (mV/ms)* −18.38 ± 1.33 −19.24 ± 2.46 −38.38 ± 2.27 35.62 < 0.001 - < 0.001 < 0.001
AHP (mV) 8.14 ± 1.56 7.44 ± 0.66 7.81 ± 1.11 0.425 0.656 - - -
AHP (ms) 219.58 ± 19.96 176.45 ± 18.64 227.04 ± 59.69 0.631 0.699 - - -
F Max (Hz)* 12.32 ± 0.95 11.80 ± 1.17 25.34 ± 1.70 31.98 < 0.001 - < 0.001 < 0.001

Abbreviations: RMP, resting membrane potential; RM, membrane resistance; τm, membrane time constant; AP, action potential; AHP, afterhyperpolarization potential; F Max, maximum frequency. Data shown as mean ± SEM; F = variance ratio; df = degrees of freedom = 2,57; p = level of significance,

*

statistically significant, p<0.05.