(A) Young rats can be classified into inferior (n = 5), intermediate (n = 10), and superior learners (n = 4) based upon the total distance swam in hidden platform training during MWM1. (B) The number of platform crossings during the probe trial correlates strongly with the total distance swam during the four hidden trials of MWM1, demonstrating that total distance swam during the hidden platform trials can be used to classify animals as impaired and unimpaired (n = 19, R2 = 0.45, p = 0.002). (C) Animals classified as superior based upon hidden platform training demonstrate significantly more platform crossings than animals classified as inferior based upon hidden platform training (p < 0.01). (D) Superior and inferior learners do not show differences in ability to locate the platform during visible platform training.