Table 1.

Results of the regression analyses on relative thresholds and false alarm rates from the practice sessions for all four observers and all three target-present stimuli in Experiment 1. Note that all $\widehat{\beta }$ values were reliably different from 0 (p < .05) except for those marked with ⁺.

	Relative Threshold				False Alarm Rate
Observer	Stimulus	Intercept	$\widehat{\beta }$	R2	Intercept	$\widehat{\beta }$	R2
1	top	0.13	−1.25	0.93	−2.18	0.30	0.58
	bottom	−0.07	−1.30	0.91	−1.80	0.14	0.57
	both	−0.25	−1.17	0.90	−2.32	0.35	0.48
2	top	−0.71	−0.45	0.36	−2.34	0.12+	0.34
	bottom	−0.15	−1.21	0.80	−3.05	0.51	0.66
	both	−0.81	−0.59	0.46	−3.07	0.51	0.62
3	top	1.07	−1.82	0.91	−2.44	0.33	0.42
	bottom	0.38	−1.53	0.91	−2.03	0.18	0.17
	both	0.34	−1.44	0.92	−2.13	0.20	0.15
4	top	0.91	−1.59	0.87	−2.00	0.25	0.58
	bottom	0.79	−0.93	0.62	−1.70	0.10+	0.36
	both	1.22	−1.55	0.77	−2.07	0.26	0.48
$\overline{X}$				0.78			0.45