Table 1.

Behavioral results

Trial type Context	Reaction time ± SD (ms)		Percentage correct ± SD (%)
	SAME	OPPOSITE	SAME	OPPOSITE
No perturbation	473 ± 60a	466 ± 53a	92.0 ± 8.0a	90.6 ± 8.2a
PTOA of −200 ms	435 ± 59**	467 ± 61	90.9 ± 8.7	89.2 ± 9.5*
PTOA of 0 ms	484 ± 69**	485 ± 61**	90.9 ± 9.0	91.2 ± 8.5
PTOA of 200 ms	492 ± 73**	481 ± 72**	94.1 ± 7.3*	91.4 ± 8.0

Population medians and SDs of reaction time and percentage correct for different trial types and both contexts (SAME, OPPOSITE). Wilcoxon’s test,

*p < 0.05, perturbation trials versus no perturbation trials;

**p < 10⁻¹⁰, perturbation trials versus no perturbation trials.

^aNo significant difference between no-perturbation trials in SAME versus OPPOSITE.