Fig A4.

For individual rats in the phase in which the left lever delivered four pellets and the right lever one pellet: visit length (presses per visit) following the larger amount as a function of the comparable visit length following the smaller amount, as in Figure 8. The sequences of food deliveries are mirror images—for example, 4-4-4-4 versus 1-1-1-1 or 1-1-1-4 versus 4-4-4-1. Triangles indicate continuations and squares discontinuations.