Figure 1.

Locomotion tasks. (A) Cats walked in an experimental box that was divided into two corridors. In one of the corridors, the floor was flat, while the other corridor contained a horizontal ladder. White circles on the crosspieces of the ladder schematically show placements of cat forelimb paws. This schematic drawing is not to scale. (B) A typical distribution of right forelimb paw prints recorded from one cat during 10 walking passages though each corridor: on a flat surface (simple locomotion) and along the ladder with crosspieces 5 cm wide (complex locomotion). View from above. The direction of the cat’s progression is shown by the arrow on the top. For simple locomotion, paw prints are adjusted to start in the same position. During the ladder task, the first paw placement during ladder locomotion was between the crosspieces. Ellipses enclose approximate areas in which 95% of paw prints were found. (Adapted with modifications from Beloozerova et al., 2010).