Table 6

Linear models and slope analysis (Ivry and Hazeltine, 1995) results for saccade latency

Dataset	Formula	β ± SE	95% CI	p-value	Adj. R²
U_short	Latency ∼ FPn	−0.051 ± 0.008	[−0.068, −0.033]	3.01 × 10^–5	0.73
	Latency ∼ HRrec	0.319 ± 0.074	[0.155, 0.484]	0.001	0.59
	σ² (latency) ∼ k2 FPn2 + c*	−18704.922 ± 7683.918	[−35305.020, −2104.826]	0.030	0.26
	σ (latency) ∼ HRclassic	−23.317 ± 3.831	[−31.748, −14.885]	7.88 × 10^–5	0.75
U_long	Latency ∼ FPn	−0.023 ± 0.005	[−0.035, −0.011]	0.001	0.54
	Latency ∼ HRrec	0.158 ± 0.032	[0.087, 0.228]	5 × 10^–4	0.66
	σ² (latency) ∼ k2 * FPn2 + c	−42253.758 ± 7100.721	[−57593.93, −26913.580]	4.82 × 10^–5	0.71
	σ (latency) ∼ HRclassic	−22.625 ± 5.603	[−34.957, −10.293]	0.002	0.56

The dataset was averaged across subjects and distinct FP_n lengths.
σ², variance; k, Weber’s fraction; c, time-independent source of response variance; adj., adjusted.