Abstract
These 2 expts. attempt to demonstrate the relationships of hypo- and hyper-thyroidism to learning. The apparatus consisted of a 12-unit, multiple-T, alley maze. The 1st experiment with 34 normal and 33 thyroidectomized rats showed that thyroid-ectomy increased errors, a speed of running and reduced retention of the maze. The results were statistically significant for errors and speed of running in the retention trials. 46 hyperthyroid rats were compared in speed of running and time to learn with 47 normal rats; their speed of running was significantly less than the normal animals, but there was no significant difference in error scores.

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