Figure 7. (A) Response area map from a neuron in the DCN (CF: 4545 Hz, CF-threshold: 15 dB, Spontaneous rate: 2 spikes/s) before the traumatising exposure. Black areas show the frequencyintensity combinations that causes an increase in the discharge rate; hatched areas show frequencyintensity combinations that inhibit the spontaneous discharge rate. Height of bars is approximately roughly proportional to the magnitude of the excitatory and inhibitory response. Note inhibitory response areas that flank the excitatory response area. (B) Response area map from the same neuron shown in (A) following a traumatising exposure (6.57 kHz, 111 dB SPL, 15 minutes). Note dramatic expansion of the excitatory response area (black area) particularly along the low frequency tail below CF and the reduction of the inhibitory response areas (hatched areas) (from Salvi et al., 1996 with permission).