Table 3.

Results of univariate ANOVA and regression analyses of ecological and behavioural characteristics on neocortex residuals and ratios.

(a) neocortex residuals
parameter			mean/coefficient	s.d.	N	F	d.f.	p	λ
sociality	sociality	yes	0.02	0.17	29	6.64	1,34	0.01	0
	no	−0.19	0.30	7
	social system	solitary	−0.19	0.30	7	3.89	3,32	0.02	0
	monogamous	0.09	0.16	12
	harem/seasonal	−0.01	0.15	13
	large stable	−0.18	0.13	4
	GM group size		0.03			0.27	1,34	0.65	0
ecology	diet	grazer	−0.11	0.14	6	1.54	3,32	0.22	0
	browser	0.05	0.15	12
	grazer/browser	0.05	0.10	7
	browser/frugivore/omnivore	−0.04	0.31	11
	habitat	open	−0.03	0.15	17	0.40	2,33	0.67	0.18
	closed	−0.05	0.31	11
	mixed	0.04	0.17	8

(b) neocortex ratios
parameters		mean/coefficient	s.d.	N	F	d.f.	p
sociality	yes	1.97	0.35	3	12.39	1,17	0.03
no	1.19	0.32	16
GM group size		0.25		19	1.56	1,18	0.23
social system	solitary	1.19	0.32	3	4.91	3,15	0.014
monogamous	2.06	0.44	3
harem/seasonal	2.03	0.38	9
large stable	1.74	0.16	4
diet	grazer	1.96	0.53	4	2.59	3,15	0.09
browser	2.08	0.52	5
grazer/browser	1.83	0.14	7
browser/frugivore/omnivore	1.30	0.42	3
habitat	open	1.95	0.39	12	1.02	2,16	0.38
closed	1.59	0.86	3
mixed	1.70	0.10	4