Position discrimination in the salamander, Ambystoma tigrinum.

Twenty larval tiger salamanders (Ambystoma tigrinum) were collected from a playa lake in West Texas and maintained in the laboratory for 7 days prior to the beginning of position training. Ten subjects in the larval state were trained on a position problem in a T-maze for 5 trials per day to a criterion of 80% correct responses, using a self-correction procedure. Following metamorphosis to the adult stage, these subjects were tested for retention. The remaining 10 subjects were allowed to metamorphose prior to training on the position problem. The results indicate reliably faster learning in the adult (terrestrial) subjects, and reliable retention of the response following metamorphosis. These results, taken in conjunction with informal observation of the behavior of the subjects in the experimental environment, suggest that the performance of the adult subjects was a result of their better perceptual apparatus.