Table 2.

Neurophysiological properties of C4- and C8-projecting corticospinal populations^a

	C4-projecting		C8-projecting
	Untrained (n > 60)	Trained (n > 40)	Untrained (n > 45)	Trained (n > 55)
Resting Vm (mV)	−67.4 ± 2.3	−67.6 ± 2.1 p = 0.62	−67.2 ± 1.8	−67.2 ± 2.2 p = 0.92
Holding pA at −65mV Vm	−12.3 ± 43	−18.5 ± 52 p = 0.57	−27.9 ± 63	−16.5 ± 37 p = 0.38
Rin (mΩ)	79.6 ± 20	77 ± 24 p = 0.44	72 ± 13.5	76.4 ± 20 p = 0.31
Spike threshold (mV)	−42.8 ± 4	−44.3 ± 4.2 p = 0.09	−42.4 ± 5	−42.9 ± 4.6 p = 0.66
Rheobase (pA)	141 ± 72	146 ± 56 p = 0.7	160 ± 77	131 ± 68 p = 0.062
Spike half-width (ms)	2.32 ± 0.4	2.38 ± 0.4 p = 0.57	2.26 ± 0.4	2.36 ± 0.4 p = 0.26
Spike height from threshold (mV)	79 ± 6.7	79.2 ± 5.9 p = 0.62	78.5 ± 9.1	78.1 ± 7.3 p = 0.73

^aData are mean ± SD. p values reflect comparisons of trained versus untrained conditions within each cell-pair group. For spike threshold, rheobase, spike half-width, and spike height, the membrane holding potential was normalized at −65 mV across cells via current injection.