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Fig. 2. Methods. Gait diagram: the x axis shows time in s. Horizontal bars
(orange for fore pair and green for hind pair) represent the time each foot is
on the ground (f1, 1-fore; f2, 2-fore; h1, 1-hind; h2, 2-hind). Each
anteroposterior sequence (APS) is identified by a grey arrow, and is labelled
from -3 to -1 for approach, 0 for impulse, 1 for landing and 2-5 for leaving.
Track diagram: The x axis shows spatial position (m) and the dot paw
prints represent the places where the feet were put down. Each APS is outlined
in grey and labelled from -3 to 5, similar to the trial gait diagram. The
places are measured as their distance to the obstacle (0), negatively before,
and positively after the obstacle. For each APS of the trial, as was shown for
the first APS, the time lag between touch-down of the two forefeet (fore lag,
FL), the time lag between touch-down of the two hindfeet (hind lag, HL) and
the time lag between the touch-down of the two trailing feet (pair lag, PL)
were noted and expressed as a percentage of the time lag between two
successive touch-downs of the 1-forefoot. Similarly, as shown on the track
diagram, the distance between the positions of the two forefeet (fore gap,
FG), between the positions of the two hindfeet (hind gap, HG), and between the
places of the two 1-feet (pair gap, PG) were noted, and expressed as a
percentage of the distance between two successive positions of the 1-forefoot.
When a 2-hindfoot was placed before the 1-forefoot, the distance was noted as
a negative value.
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