Principal component extraction, followed by standard Varimax normalized rotation, identified three orthogonal factors with Eigenvalues >1.0 which, together, explained 73.0% of the variance (Table 1). These were labeled as “Anxious”, “Exploratory/Bold” and “Attached” 34. Animals with the C/G genotype rated higher on the “Exploratory/Bold” dimension (Figure 4A, F(1, 93)=6.6, P =0.01) than did those homozygous for the C allele, with genotype accounting for 7% of the total variance of this trait. In contrast, the other behavioral dimensions were not influenced by genotype (n.s.).
