Table 1.

Spike threshold variability in different intrinsic classes of cortical neurons expressed in millivolts relative to baseline

	RS cells (n = 18)	IB cells (n = 14)	FS cells (n = 5)	CH cells (n = 10)	All cells (n = 47)
Spontaneous activity	1	2	3	4	5
	14.2*2–4,6  ±  1.2*6	16.4*1,3–4,7  ±  1.4*7	4.4*1–2,4  ±  0.8*8,1,2,4	21.1*3  ±  1.5*9	13.8*10  ±  1.4*10
Visual responses	6	7	8	9	10
	16.2*7–8  ±  2.2*1	18.1*6,8,2  ±  2.6*2	5.6*6–7,9  ±  1.1*3,6,7,9	21.2*6,8  ±  2.5*4	15.4*5  ±  2.3*5

RS, regular spiking; IB, intrinsic bursting; FS, fast spiking; CH, chattering. All data expressed as mean ± SD. 

^*Significantly different (P < 0.05) than the indicated subgroup.