(A) Pavlovian fear discrimination consisted of three cues predicting unique foot shock probabilities: danger, p = 1.00 (red); uncertainty, p = 0.375 (purple); and safety, p = 0.00 (blue). (B) Microelectrode bundle placements for all rats (n = 6) and all neurons (n = 245) during recording sessions are represented by salmon bars. (C) Mean + individual (data points) suppression ratio for danger, uncertainty, and safety is shown for all recording sessions (n = 88). (D) Normalized firing rate in 1 s intervals is shown for each Flip (n = 45, top) and Sustain (n = 46, bottom) neuron for each trial type (danger, uncertainty and safety). Color scale for normalized firing rate is shown to the right; red indicates high firing and blue low firing. Cue onset and offset are indicated. Single-unit waveform properties of Flip (sea foam) and Sustain (periwinkle) neurons are shown: (E) baseline firing rate, (F) half the duration, and (G) amplitude ratio. +95% bootstrap confidence interval for differential suppression ratio does not contain zero.