TABLE III. CHANGES TO THE FOUR COLORS. Average time in seconds. 72 changes from and 72 changes to each color. [Label 1: To Blue.] [Label 2: Return from Blue.] [Label 3: To Green.] [Label 4: Return from Green.] [Label 5: To Yellow.] [Label 6: Return from Yellow.] [Label 7: To Red.] [Label 8: Return from Red.] [1] [2] [3] [4] [5] [6] [7] [8] From blue, 2.26 1.52 2.11 1.50 2.12 1.39 " green, 2.38 1.53 2.16 1.64 2.33 1.57 " yellow, 2.49 1.75 2.61 1.59 2.52 1.68 " red, 2.67 1.52 2.58 1.68 2.27 1.62 Average, 2.52 1.60 2.48 1.59 2.17 1.58 2.33 1.55 _Changes from_ a presented color. _Returns to_ a presented color. 216 movements. 216 movements. _From_ presented yellow, 2.52 _To_ presented yellow, 1.67 " " red, 2.49 " " red, 1.61 " " green, 2.29 " " green, 1.58 " " blue, 2.16 " " blue, 1.47 Average, 2.37 Average, 1.58 _Changes to_ a color _from_ _Returns from_ a color _to_ a presented color. a presented color. 216 movements. 216 movements. _To_ blue, 2.52 _From_ blue, 1.60 " green, 2.48 " green, 1.59 " red, 2.33 " yellow, 1.58 " yellow, 2.17 " red, 1.55 Average, 2.37 Average, 1.58 The six subjects fall into two groups--three, H., I., and K., taking longer than the other three. As in the previous experiment H. was markedly longer than any of the others. There were seventeen hundred and twenty-eight changes in all, including returns to the original color. There were two hundred and sixteen changes from each of the four colors as presented, to each of the other three and, of course, the same number of returns to the presented color. The change to blue from the other presented colors was the most difficult and the change to yellow was the easiest. The averages (216 exp. each) are, Sec. To blue, 2.55 " green, 2.48 " red, 2.33 " yellow, 2.17 The returns to the presented colors did not differ greatly from each other, the averages (216 exp. each) being: Sec. From blue, 1.603 " green, 1.597 " yellow, 1.589 " red, 1.549 From red appears to be the easiest change, and from blue the hardest. The getting away from a presented blue was the easiest and from a presented yellow the most difficult, as seen by these averages (216 exp. each): Sec. From yellow, 2.54 " red, 2.49 " green, 2.29 " blue, 2.16