Table 1A.

Factor loadings from a principal component analysis (unrotated) of all 58 animals (30 young, 28 old) of acquisition of six learning tasks

^aIn the cases of passive avoidance and fear conditioning, in their raw form, higher performance scores reflect better learning, whereas for all other learning tasks, lower performance scores reflect better learning. So that all learning scores are represented with the same valance, the performance scores for passive avoidance and fear conditioning are entered into the factor analysis as inverse values. For all learning measures, lower raw scores reflect better performance.