Table 2.

Comparison of time constants for two Voigt-element plants in four species

	T1	T2	TZ	Fit r2
Mouse	0.114	0.876	0.498	0.996
Rabbit	0.275	3.390	1.640	0.973
Cat	0.112	2.959	2.285	0.977
Cat 2	0.141	0.689	0.600	0.845
Rhesus	0.063	0.482	0.271	0.980
Rhesus, displacement	0.026	0.102	n/a	n/a

Values are time constants for 2-pole, 1-zero (2P-1Z) plants, where T₁ andT₂ are time constants of the poles and T_Z is the time constant of the zero, determined by fitting r/k vs. frequency curves for mouse, rabbit (Stahl and Simpson 1995), cat, and rhesus (Fuchs et al. 1988). Cat data are based on mean data from 9 motoneurons (MN) and 7 internuclear neurons (INT) (Goldberg 1980). Cat 2 data are based on pooling 1 MN and 1 INT in a published study (Delgado-Garcia et al. 1986a, 1986b). Rhesus, displacement data include the comparable pole time constants for the rhesus determined from movements following electrical stimulation of the abducens nerve (Anderson et al. 2009).