Fig. 5.

The generality of the developmental sequence in free C57BL/6 mice. Numerals and respective background colors represent the landmark motions that were described in Fig. 1 in the order of their emergence in each of the mice. Top two rows represent the prototype sequences of each of the two strains. Cross-the-doorway-and-retreat (Landmark 2) is skipped in all but one of the C57BL/6 mice; Extended-garden-roundtrips (4') are inserted in all C57BL/6 mice before or immediately after the onset of Borderline-roundtrips (6). Simple Incursions (9) typically emerge before the borderline dimension is exhausted (8) and early crossing of the center (11) occurs before Border-related-shuttles (10) in most of the mice.