Table 2.

Means, number of animals and standard error of the mean (SEM) of the measures that were used in the correlation analyses (A). The per cent variation covered by the linear trend component calculated for all pigs of a study of acquiring the reference memory and working memory components of the holeboard task are listed in B

	Study 1			Study 2			Study 3
	Mean	N	SEM	Mean	N	SEM	Mean	N	SEM
A
HBT
RM mean	0.480	16	0.019	0.497	37	0.013	0.535	20	0.017
RM slope	0.044	16	0.004	0.049	37	0.003	0.052	20	0.004
WM mean	0.838	16	0.015	0.837	37	0.008	0.820	20	0.012
WM slope	0.009	16	0.005	0.018	37	0.002	0.016	20	0.002
CDT
Sessions to criterion	10.600	15	0.815	16.324	37	0.595	22.222	18	1.390
JBT
Optimistic choice %	38.333	15	5.040	75.450	37	2.693	50.926	18	4.451

	Per cent explained variation
	Study 1 (%)	Study 2 (%)	Study 3 (%)
B
HBT RM lin. trend component of the within-subjects variation	98.34	99.04	96.18
HBT WM lin. trend component of the within-subjects variation	59.14	82.98	67.92

HBT holeboard task, CDT conditional discrimination task, JBT judgement bias task, RM reference memory, WM working memory