FIGURE 6.

The synaptic responses of the three types of ICD neurons changed before and after the lidocaine injection and exposure to contralateral, binaural, and ipsilateral stimuli. (A–C) The average normalized peak amplitude of synaptic currents in the three types of ICD neurons. The three types of neurons were divided according to the change ratio of excitatory and inhibitory synaptic responses at the BF upon exposure to ipsilateral stimuli after the lidocaine injection. The excitatory currents of type I neurons decreased more significantly than the inhibitory currents (A). The inhibitory currents of type II neurons decreased more significantly than the excitatory currents (B). The excitatory and inhibitory currents of type III neurons were unchanged or decreased evenly (C). The light lines and symbols represent the individual neurons. Bar graphs show the means ± SEM.