Table 2.

Statistical post-hoc planned comparisons of F_s (sustained load) and F_max (maximal load) for trials when the spring slipped vs. when the spring did not slip. The above values are all for Day 2. These results indicate that subjects did not maintain a “safety margin” during the successful (i.e., no-slip) performance of this dynamic manipulation task. The ANOVA across conditions, was significant with p<0.0001.

Subject Condition	$\Delta F_s=F_s^{\mathrm{slip}}-F_s^{\mathrm{no}–\mathrm{slip}}$ in N	p-value	$\Delta F_{max}=F_{max}^{\mathrm{slip}}-F_{max}^{\mathrm{no}–\mathrm{slip}}$ in N	p-value
Normal	0.01	0.912	0.03	0.708
No vision	0.15	0.530	-0.07	0.688
Nerve-blocked	0.05	0.667	0.12	0.197
No vision, Nerve-blocked	-0.01	0.900	0.03	0.700