Table 3.

Univariate analyses of population changes against relative size of four brain components.

continuous variables	slope	r2	F1,23	p
telencephalon	1.44	0.35	12.58	0.002
brain stem	1.83	0.28	5.84	0.02
cerebellum	0.93	0.11	2.59	0.12
optical lobes	0.61	0.04	0.90	0.35