1. That when the objects are similar surfaces, seen under similar conditions, the chances of the recurrence and persistence of their images are, on the whole, practically equal.
2. That surfaces bounded by complicated outlines have an advantage in ideation, other things equal, over surfaces bounded by simple outlines.
3. That as between two objects of unequal area—color, form, and other conditions being the same—the larger object has the advantage in the ideational rivalry.
4. That the image of a white object has a like advantage over the image of a gray object.
5. That broken or complex lines have in ideation an advantage over straight or simple lines.
6. That an object with varied content, other conditions remaining the same, has an advantage over an object with homogeneous surface.
7 and 8. That an increase of the time during which the attention is given to an object increases the chances for the recurrence of its image or idea.
9. That of two objects to which attention is directed in succession, the object last seen has a distinct advantage in the course of ideation following close on the perception of the objects.
10. That lines of similar appearance and equal length, one of which is vertical and the other horizontal, have, like surfaces of similar appearance and form and equal dimensions, practically equal chances of recurrence and survival in ideation, the slight difference in their chances being in favor of the vertical line.
11. That as between two figures of similar form and equal dimensions, one of which has a filled homogeneous content and the other is a mere outline figure, the latter has a marked advantage in the course of ideation.