Figure 5.

Auditory responses and contextual effects are diverse among amygdalar neurons. Results from four neurons plotted as peristimulus time histograms of responses to the indicated acoustic stimulus in two contexts: neutral (gray) and predator (red). The gray bars represent the duration of the acoustic stimulus. For each neuron, inset shows overlapping spike waveforms. A, This neuron's inhibitory–excitatory auditory response pattern was only weakly modulated by context. B, An early excitatory response was present for the LFH call only in the presence of the predator cue; the later acoustic responses were suppressed by the predator cue. C, Lack of auditory response in the neutral context changed to a suppressive response in the predator context. D, The predator cue substantially increased both the early and the later response to the LFH call. Among all neurons, note the long duration of many responses relative to stimulus duration.