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Figure 3


Fig. 3. Responses of interneuron C1 to body and substratum tilting. (Ai) Body tilting by 90° in the air. The top trace shows the spike activity recorded extracellularly from the circumesophageal commissure (CC). The spike activity of interneuron C1 was isolated electronically from the commissural recording and is shown in the middle trace. The bottom trace monitors animal body tilting, the upward and downward deflection indicating ipsilateral-side-down (ISD) and contralateral-side-down (CSD) tilting, in which the side of commissural recording was lowered and lifted, respectively. (Aii) Statistical comparison of interneuron activities between horizontal, ipsilaterally tilted and contralaterally tilted positions (*P<0.05; ANOVA). The inset shows superimposition of electronically isolated spikes in Ai. (Bi) Substratum tilting by 10°. The animal was standing on the tilted substratum. Since the animal was free to evoke postural reflexes, the exact angle of body tilt on the tilted substratum was unknown. The recording for each positioning was made intermittently whenever the freely behaving animal met the behavioral and orientation requirements. (Bii) Statistical comparison of the interneuron activities (*P<0.05; ANOVA).





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