Table 1.

Dependence of the OFR on the disparity of the conditioning bands (parameters of the least-squares best-fit Gaussian functions): sensitivity to the disparity of the test bands.

Subj	Motion	Test Disparity dt	Y-offset A	Scale factor g	Widthσ	X-offset μ	Peak P	Amplit P-A	r2	Range of N	Mean Difference in Vergence Angle	Slope:μ vs. dt
FM	Test leftward Cond rightward	Uncrossed	0.023	0.337	0.86	0.07	0.179	0.156	0.98	166–174	0.015*	0.18 (0.18)
		Zero	−0.085	0.198	0.55	0.11	0.058	0.142	0.92	172–176
		crossed	−0.023	0.192	0.88	0.65	0.064	0.087	0.94	164–175
	Test rightward Cond leftward	uncrossed	0.188	−0.533	1.02	0.55	−0.020	−0.208	0.96	166–175	0.017*	0.06 (0.07)
		zero	0.311	−0.344	0.98	0.80	0.171	−0.140	0.92	167–177
		crossed	0.162	−0.235	0.77	0.76	0.041	−0.121	0.91	163–177
DY	Test leftward Cond rightward	uncrossed	−0.059	0.250	0.75	0.49	0.073	0.132	0.99	123–137	0.015*	0.05 (0.04)
		zero	−0.125	0.184	0.63	0.41	−0.008	0.117	0.97	126–138
		crossed	−0.099	0.237	0.72	0.64	0.033	0.132	0.98	126–135
	Test rightward Cond leftward	uncrossed	0.057	−0.225	0.71	0.63	−0.069	−0.126	0.99	127–136	0.005	0.06 (0.07)
		zero	0.136	−0.152	0.67	0.56	0.045	−0.091	0.95	129–138
		crossed	0.098	−0.233	0.70	0.82	−0.035	−0.133	0.99	127–134
BS	Test leftward Cond rightward	uncrossed	−0.113	0.401	0.98	−0.19	0.051	0.164	0.97	69–76	0.019*	0.02 (0.01)
		zero	−0.181	0.342	0.92	−0.41	−0.033	0.148	0.99	69–79
		crossed	−0.110	0.439	0.90	−0.13	0.086	0.196	0.99	70–76
	Test rightward Cond leftward	uncrossed	0.106	−0.434	1.08	−0.04	−0.054	−0.160	0.95	69–81	0.024*	0.02 (0.02)
		zero	0.162	−0.308	0.77	−0.28	0.002	−0.160	0.96	69–80
		crossed	0.071	−0.368	0.83	0.04	−0.105	−0.176	0.98	69–79
NB	Test leftward Cond rightward	uncrossed	0.001	0.204	0.82	0.34	0.100	0.099	0.90	74–82	0.022*	0.01(0.01)
		zero	−0.085	0.187	0.73	0.00	0.017	0.102	0.99	74–82
		crossed	−0.026	0.275	0.79	0.36	0.112	0.138	0.98	75–82
	Test rightward Cond leftward	uncrossed	0.072	−0.179	0.64	0.23	−0.040	−0.112	0.96	75–81	0.021*	0.04 (0.03)
		zero	0.144	−0.118	0.66	−0.04	0.073	−0.071	0.92	75–81
		crossed	0.077	−0.170	0.60	0.35	−0.037	−0.114	0.95	74–81

The Gaussian function in Expression 1 was fitted to plots like those in Fig. 1, each plot having 13 data points, which were the means of multiple samples (Range of N, range of samples used for each mean); the parameters of these fits are given by A, σ, μ, P, and P-A, which are in degrees, and g, which is dimensionless. Mean Difference in Vergence Angle, a mean pre-response vergence angle was first computed by averaging the vergence angles over the time period 0–83 ms (from onset of stimulus motion) for all 13 conditioning disparities for each value of d_t, then the mean pre-response vergence angle when d_t was uncrossed was subtracted from the mean pre-response vergence angle when d_t was crossed. Slope: μ vs. d_t, gives the slopes of the linear regression of x-offset (μ) on the disparity of the test bands (d_t); values in parentheses were obtained after adjusting the disparities for any vergence error.

^*p < 0.05 (Student’s t-test).