Table 2.

Dependence of synchronization strength measures on activity level

Geometric mean of firing rate for MN pair				Geometric mean of interspike interval for MN pair
	r²	p	b		r²	p	b
k′-1	0.09	0.0002	−0.37	k′-1	0.25	0.0000	1.16
S	0.004	0.3971	−0.003	S	0.05	0.0035	0.01
SI	0.11	0.0000	−0.4	SI	0.28	0.0000	1.14
CIS	0.22	0.0000	0.07	CIS	0.10	0.0000	−0.09
CC	0.007	0.2661	−0.01	CC	0.05	0.0019	0.04

The results obtained from the linear regression of synchronization strength measures to either the geometric mean of interspike interval or of firing rate for each pair of motor neurons.r² is the amount of variance explained by the regression, p is the significance level of the regression, and b is the slope of the regression. See Materials and Methods, Evaluation of synchronization strength, for description of the different measures.