An example inferior colliculus neuron reversed the response polarity, from no excitatory response to self-produced vocalizations to vocalization-playback-induced excitation. (VIDEO)
Caption
The top left panel shows the bandpass-filtered neural recording for spikes between 600 and 3, 000 Hz. The bottom left panel shows the spectrogram (5–90 kHz bandpass filter) of the self-produced echolocation calls in the vocalization condition or the vocalization playbacks. The top right panel displays the waveforms of the superimposed spikes for the isolated single unit. The bottom right panel displays the vocalization-onset-aligned spikes (raster plot). Note that this example neuron (Ha073_04r62_chn15, 2610 μm recording depth) showed spontaneous firing that was not related to the vocalization or vocalization playback, which was typical for the sampled IC neurons during the behavioral/awake setup. Both the audio of the echolocation calls and the neural recordings were slowed down by a factor of 16 times.
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