Figure 8.

Reconfiguration of tadpole motor circuits by intrinsic properties during swimming and struggling. During swimming (left), cINs, MNs, and aINs, but not dINrs, receive sufficient background excitation to inactivate I_A and enable them to fire reliably. During struggling (right), strong excitation inactivates I_A in cINs, MNs, aINs, and dINrs, and allows them to fire vigorously, but dIN activity is suppressed by I_Na⁺ inactivation. Repetitive activation of RB neurons also recruits ecINs during struggling. Synapses on boxes mean all neurons inside receive the inputs. Thick black lines indicate vigorous firing. Gray shows little/weak activity. Only sensory pathways on the left side are shown. dlc, Dorsolateral commissural interneurons; dla, dorsolateral ascending interneurons.