Table 3.

Slope and R² values associated with the regression analysis of head-free eye-in-head velocity versus head velocity (A) and head-fixed eye velocity or head-free eye-in-head velocity versus head velocity alone (B)

		A. Eye-in-head vs. head (KV) and head-fixed eye (Kfx)				B. Eye-in-head vs. head (Kv)
Condition	Subject	Slope (Kv)	Slope (Kfx)	Delay (ms)	R2	Slope (KV)	R2
IE	1	−0.702	0.635	25	0.997	−0.534	0.960
	2	−0.945	1.243	20	0.998	−0.610	0.967
	3	−1.035	1.068	5	0.985	−0.576	0.893
	4	−0.672	0.476	10	0.982	−0.557	0.932
	5	−1.029	1.109	5	0.991	−0.557	0.970
	6	−0.775	1.381	15	0.952	−0.592	0.909
SRE	1	−0.614	0.719	25	0.984	−0.556	0.628
	2	−1.004	1.186	5	0.997	−0.684	0.851
	3	−0.753	1.098	20	0.935	−0.501	0.516
	4	−0.887	1.266	15	0.955	−0.436	0.530
	5	−0.802	1.185	5	0.991	−0.598	0.611
	6	−0.702	0.585	25	0.935	−0.699	0.800
MRE	1	−0.618	0.666	5	0.979	−0.503	0.813
	2	−1.074	1.195	15	0.994	−0.606	0.858
	3	−1.045	1.508	15	0.905	−0.293	0.142
	4	−1.186	1.378	25	0.965	−0.508	0.582
	5	−0.793	1.106	15	0.959	−0.555	0.523
	6	−0.625	0.507	5	0.900	−0.587	0.676
IE	Average	−0.860	0.985	15	0.984	−0.571	0.938
SRE	Average	−0.794	1.006	15	0.966	−0.579	0.656
MRE	Average	−0.890	1.060	15	0.950	−0.509	0.599

The analysis shows that there is a much better fit to the data when a component proportional to head-fixed eye velocity is included (cf. R² values in columns 6 and 8). Optimum delays are also given (column 5). Data for 10 and 20 deg s⁻¹ stimuli were combined in each subject.