Table 2.

Paired-sample t tests for Response Speed.

Exp.	Array		Target Present				Target Absent
	Size	Face Type	t	df	p	d	t	df	p	d
1	16	Human vs. Primate	4.33	34	< .001	0.73	0.43	36	0.669
		Human vs. Mammal	9.05	35	< .001	0.17	4.09	36	< .001	0.67
		Primate vs. Mammal	6.81	35	< .001	1.13	3.75	36	0.001	0.62
	36	Human vs. Primate	5.95	35	< .001	1.01	1.55	36	1.55
		Human vs. Mammal	11.53	35	< .001	1.95	5.81	35	< .001	0.97
		Primate vs. Mammal	4.06	35	< .001	0.69	5.56	35	< .001	0.93
	64	Human vs. Primate	5.66	36	< .001	0.94	3.85	36	< .001	0.63
		Human vs. Mammal	10.88	36	< .001	1.81	5.97	36	< .001	0.98
		Primate vs. Mammal	6.65	36	< .001	1.11	1.66	36	0.105
2	16	Human vs. Primate	1.6	32	0.119		1.87	32	0.071
		Human vs. Mammal	6.75	32	< .001	1.18	2.55	32	0.016	0.44
		Primate vs. Mammal	6.71	32	< .001	1.17	1.12	32	0.27
	36	Human vs. Primate	8.15	32	< .001	1.42	0.27	32	0.79
		Human vs. Mammal	9.74	32	< .001	1.69	0.98	32	0.332
		Primate vs. Mammal	6.5	32	< .001	1.13	1.48	32	0.148
	64	Human vs. Primate	3.16	32	0.005	0.52	0.75	32	0.456
		Human vs. Mammal	7.81	32	< .001	1.36	0.65	32	0.524
		Primate vs. Mammal	5.89	32	< .001	1.03	1.58	32	0.125
3	16	Human vs. Macaque	0.95	34	0.349		4.04	34	<.001	.68
		Human vs. Sheep	5.69	34	< .001	0.96	1.85	34	0.073
		Macaque vs. Sheep	6.42	34	< .001	1.09	3.01	34	0.005	0.51
	36	Human vs. Macaque	4.79	33	< .001	0.82	2.97	34	0.005	0.5
		Human vs. Sheep	9.57	33	< .001	1.64	5.59	34	< .001	0.95
		Macaque vs. Sheep	7.61	34	< .001	1.29	3.02	34	0.005	0.51
	64	Human vs. Macaque	2.95	34	0.006	0.5	3.71	34	0.001	0.63
		Human vs. Sheep	10.34	34	< .001	1.75	7.34	34	< .001	1.24
		Macaque vs. Sheep	6.06	34	< .001	1.02	3.93	34	< .001	0.66
4 (Car)	16	Human vs. Primate	3.36	29	0.002	0.61	3.11	32	0.004	0.54
		Human vs. Mammal	3.52	28	0.001	0.65	3.4	32	0.002	0.59
		Primate vs. Mammal	0.31	29	0.758		0.63	32	0.533
	36	Human vs. Primate	2.64	26	0.014	0.51	0.65	32	0.520
		Human vs. Mammal	2.19	28	0.037	0.41	2.03	32	0.051
		Primate vs. Mammal	1.37	27	0.182		0.65	32	0.520
	64	Human vs. Primate	1.35	29	0.187		0.98	32	0.335
		Human vs. Mammal	1.27	30	0.213		0.56	32	0.582
		Primate vs. Mammal	2.01	29	0.054		0.75	32	0.462
4 (Butterfly)	16	Human vs. Primate	2.94	31	0.006	0.52	1.29	32	0.207
		Human vs. Mammal	0.78	32	0.439		4.23	32	< .001	0.74
		Primate vs. Mammal	0.04	31	0.966		1.31	32	0.201
	36	Human vs. Primate	0.62	31	0.541		1.70	32	0.099
		Human vs. Mammal	0.14	30	0.886		4.00	32	< .001	0.7
		Primate vs. Mammal	1.10	31	0.281		1.90	32	0.067
	64	Human vs. Primate	1.81	31	0.079		2.44	32	0.021	0.42
		Human vs. Mammal	2.38	31	0.024	0.42	3.56	32	0.001	0.62
		Primate vs. Mammal	0.51	32	0.611		1.62	32	0.116

Note. Paired sample t tests for each of the three experiments. Target present trials represent gaze RTs to face (Exp. 1–3) or non-face (Exp. 4) targets. Target absent trials represent manual RTs to report targets as absent.