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. Author manuscript; available in PMC: 2014 Dec 16.
Published in final edited form as: Int Rev Neurobiol. 2012;104:135–157. doi: 10.1016/B978-0-12-398323-7.00006-9

Figure 6.

Figure 6

Correlation matrix of nine water maze (WMZ) traits from Milhaud and colleagues (2002). Traits covary well, and it is therefore useful to statistically represent some of these traits by a principal component (see bottom of figure). In this case a synthetic PC trait can explain over 75% of the total phenotypic variance among genotypes of mice. Synthetic traits can be used like all other standard traits for mapping and behavioral analysis.