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Fig. 5. Interneuron C1 activity during free walking. (Ai) Recordings
from an animal that spontaneously initiated walking (vertical broken line) on
the horizontal floor of the aquarium. The top trace shows the extracellular
recording from the circumesophageal commissure (CC); the second trace shows
the EMG recording from the mero-carpopodite flexor muscle of the right second
leg; the third trace shows interneuron C1 activity, which is also
represented in the form of a frequency histogram with the time bin of 1 s
underneath. (ii) Superimposition of interneuron spikes discriminated from the
commissural recording. For clarity, the superimposed record is enlarged in
both the time and voltage scale. The former scale is provided in the figure
while the latter factor was 3.0 relative to the raw data. (B) Statistical
comparison of interneuron C1 spike activity between the resting and
walking conditions (*P<0.05; Mann–Whitney U-test).
(C) Interneuron activity when the animal walked on the tilted floor in
different directions. The angular coordinate is shown in
Fig. 1B. When the animal walked
in 0° and 180° directions, the floor was bilaterally symmetrical for
the animal body. In the direction of 90° and –90°, the animal
body was tilted in the contralateral-side-down and ipsilateral-side-down
directions, respectively. The gray bars depict the animal walking on the
substratum tilted in the contralateral-side-down direction.
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