Figure 3.   Recordings from the bath electrodes and tail-flip behavior during fighting. A, NG tail-flip field potential. The field potential lacks the giant spike potential and the large MoG potential characteristic of a giant neuron response and consists only of FF muscle potentials in response to the FF motor neurons. B, MG circuit activation and tail-flip field potential. The MG spike potential (*) and the large, biphasic MoG potential can be seen, followed by the lower-amplitude response of the FF muscle to the FF motor neurons. C, Offensive tail-flip field potential (top) and behavior (bottom). The signal is identified by its small amplitude and extremely long signal duration and results from a prolonged activation of the FF muscle by the FF motor neurons. No giant spike potential is recorded. Bracketed periods of the trace correspond in time with the sequence of frames.