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Fig. 4. Effects of leg and abdominal movements on interneuron C1
activity. (A) Body tilting in the contralateral-side-down direction (i)
without a leg substratum when the animal was at rest and (ii) with actively
moving legs. The animal body was kept tilted during the recording shown in i
and ii. In each part, the top trace monitors muscle activity whereas the
bottom trace monitors interneuron C1 activity. (B) An exceptional
case in which the interneuron activity was affected by leg movements in the
air. The spike activity during maintained tilt of the resting animal (i) was
significantly enhanced when the animal actively moved its walking legs (ii).
(C) Effects of abdominal posture movements on interneuron activity. Upward and
downward arrows indicate the onset time of abdominal extension and flexion
movements, respectively. No noticeable change was observed in interneuron
activity during these movements.