Table 1.

Calculation of the respective quartiles concerning. (A) the learning performance (number of TTC) in the initial discrimination task (ID); (B) the activity scores based on the results of the principal component analyses of the first open field/novel object test (44); and (C) the boldness scores based on the results of the principal component analyses of the first open field/novel object test. Respective lower and higher limits as well as the category description and number of animals per quartile are indicated.

Quartile label	Lower limit	Higher limit	Description	n (animals)
(A) Quartile limits based on the number of TTCs
Q1	20	20	“High performer”	24
Q2	40	80	“Good performer”	22
Q3	100	200	“Poor performer”	24
Q4	220	1,700	“Low performer”	24
(B) Quartile limits based on activity scores
A1	−3	−0.5248	“Very inactive”	24
A2	−0.5249	0.0459	“Inactive”	23
A3	0.046	0.6414	“Active”	24
A4	0.6415	3	“Very active”	24
(C) Quartile limits based on boldness scores
B1	−3	−0.9164	“Very unbold”	24
B2	−0.9165	−0.0655	“Unbold”	24
B3	−0.0656	0.7794	“Bold”	23
B4	0.7795	3	“Very bold”	24