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Responses of an IC neuron to a 5 msec pure tone at different sound levels. The traces are arranged with low sound levels at the bottom and high sound levels at the top. There are no spikes in the top or bottom trace. The arrow points to the IPSC that persisted at high sound levels above the upper excitatory threshold of the neuron. This neuron had a resting potential of −59 mV. Spikes in the trace at 34 dB SPL have been truncated.
