Centre-of-Gravity Fixations in Visual Search: When Looking at Nothing Helps to Find Something

Table 2

Experiment  2: effect of window size on eye movement parameters.

	Viewing condition					Effect of window size
	Free V	Z 320	Z 200	Z 150	Z 70	𝐹	𝑃	𝜂𝑝^2
RT
Pres.	2267**	2381**	2585**	2748**	3763	35.9	<.001	0.76
Abs.	3809**	3860**	4127**	4696**	5877	50.4	<.001	0.82
Error
Pres.	22.9	21.4	26.2	22.7	30.4	1.6	n.s.
Abs.	3.4	2.2	1.8	1.0	3.7	1.7	n.s.
Number of stim. fix.
Pres.	6.1**	6.4**	6.8**	7.1**	9.6	15.5	<.001	0.058
Abs.	14.2*	14.0*	14.8*	16.4	16.7	5.0	.014	0.31
Number of void fix.
Pres.	0.6**	0.4	0.5	0.3	0.4	3.7	.011	0.25
Abs.	0.8**	0.7*	0.6	0.6	0.5	3.3	.018	0.23
Dwell time
Pres.	164**	171**	171**	185**	212	45.6	<.001	0.80
Abs.	168**	173**	177**	185**	219	48.6	<.001	0.81
Prop. stim. fix.
Pres.	90.6**	93.2**	92.7	95.0	96.2	6.5	<.001	0.37
Abs.	94.5*	94.7	95.0	96.1	96.3	2.4	.062	(0.18)
Prop. void fix.
Pres.	9.2**	6.4**	6.9*	4.5	3.6	9.5	<.001	0.47
Abs.	5.4**	5.2*	4.6	3.7	3.0	4.9	.002	0.31
Proportion of 1st stim.
Pres.	81.8	82.3	82.2	90.4*	81.2	1.9	n.s.
Abs.	81.2	84.9	83.7	86.6	80.5	1.5	n.s.
Proportion of 1st void
Pres.	18.2	17.7	17.8	9.2*	18.8	2.0	n.s.
Abs.	18.8	15.1	16.0	13.4	19.5	1.6	n.s.

^∗𝑃<.05, ^∗∗𝑃<.01 for the comparison to the narrowest zoom condition (Z70).