Figure 6.
VP firing rate coding of CS and UCS during phase two on day 1 (normal homeostasis) and day 2 (sodium depletion) during trials “CS plus UCS” with actual taste reward infusions. On normal day 1, VP neurons fire to CSsucrose and to sucrose taste UCS, but not significantly to CSsalt or salt taste. On sodium-depleted day 2, neurons fire to CSsalt as well as CSsucrose, and fire even more vigorously to salt taste than to sucrose taste. The format follows Figure 4, with the brown line indicating the timing of actual taste infusions. *p < 0.05.