The raster plots show spontaneous activity of individual DCN neurons recorded extracellularly.
A, Photorelease of GABA, at the time indicated by the black triangle, induced a pause followed rebound firing in form of short high frequency burst (marked with a white triangle above the first raster). Bath application of mibefradil (added at the time marked on the left) blocked rebound firing.
B, 10 electrical stimuli @ 100 Hz were delivered at the time indicated by the arrow to activate inhibitory synaptic inputs to a DCN neuron. After the stimulus-induced pause, prominent rebound firing was observed as a high-frequency burst of action potentials (white triangle). The “*”s denote traces in which a clear long lasting increase in firing rate was seen. Bath application of mibefradil (at the indicated time on the left) blocked rebound firing, including the long responses.