Table 1.

Strength of the negative-stiffness environments used during reflex experiments and maximal endpoint stiffness magnitude along the primary and secondary principal axes of endpoint stiffness

	Field Strength, N/m			Maximal Endpoint Stiffness, N/m
Subject	Experiment 1	Experiment 2	Experiment 3	Primary Axis	Secondary Axis
1	−500		−1650	1462	227
2	−600	−600	−1800	622	165
3	−300	−300		1154	425
4	−600	−600	−1850	1994	455
5	−500	−500	−1550	1138	314
6	−250	−250		938	217
7	−500		−1600	751	198
8	−500			1319	197
9	−500			795	168
10	−400			742	181