Table 3.

Properties of the Open Probability Transient Induced by the Ca Spike

Parameter		Filter cutoff frequency
		2 kHz*	5 kHz‡	10 kHz‡
t o	Average open time	2.22 ± 0.18 ms	1.93 ± 0.24 ms	1.41 ± 0.05 ms
τa	Activation time constant	0.34 ± 0.02 ms§	0.16 ± 0.03 ms	0.14 ± 0.03 ms
n a	Exponent of activation	1.77 ± 0.46§	2.96 ± 0.74	2.48 ± 0.42
t d	Time constant of deactivation	3.14 ± 0.85 ms	3.03 ± 0.34 ms	3.47 ± 0.60 ms
P o	Peak open probability	0.32 ± 0.08	0.24 ± 0.03	0.22 ± 0.01

*n = 5; ^‡ n = 3; ^§significantly different from the data measured at 5 and 10 kHz bandwidth (P < 0.05).