Figure 6.

A subpopulation of neurons developed a phasic excitation to the empty port during acquisition of extinction. A, Temporal dynamics of a BLA neuron that developed a phasic excitation to the empty port during extinction from another representative rat. Surface plot of normalized firing rate was calculated using 150 ms bins, and was smoothed for ±1 trial. B, This rat also shows an increase in the probability of performing another port entry following a port entry during late extinction, relative to early extinction (p < 0.05).