Figure 9.

The 3:2 trajectory on the w-h phase plane. (a) The 3:2 periodic trajectory of F projected on the w-h phase plane shows two periodic loops indicating that the trajectory can be thought of as a combination of a 1:1 and a 2:1 solution. Different colors match the distinct sections of the trajectory on LB (blue and yellow), MB (green and red) and RB (black) as shown in the voltage trace of F (inset; same trace as in Fig. 8(d1)). (b) Blow-up of the shaded region in panel (a). White and solid circle indicate the landing points of trajectory on MB. Dashed grey arrow shows the time t₂ at the onset of inhibition from O, indicating that the green trajectory on MB has not reached the jump curve LK (which now shifts to LK¹ until the end of inhibition at t₃) and is therefore stuck on MB for this cycle of inhibition.