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Fig. 2. Firing pattern in swim interneuron 1. (A) Lower trace: intracellular
recording from Rsint1 during a short episode of swimming. Swimming
was initiated by separating the animal's foot from a surface at the first
arrow and terminated by returning the surface at the second arrow. Upper
trace: a record of the animal's side-to-side swimming movements (upward
deflection indicates bending toward the right). (B) Lower trace: bursting
activity in Rsint1 at higher gain and on an expanded time base.
Insert: the trajectory of membrane voltage at the end of a burst on an
expanded scale. Action potentials were truncated by the recording device in
this example. Upper trace: a record of the animal's movement. (C) Simultaneous
recording of activity in Rsint1 (middle) and Lsint1 (bottom)
during a long swimming episode along with the record of swimming movements
(top). Note that the spike bursts in these two cells do not overlap.
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