Midbrain electrosensory neurons display feature invariant responses to natural electrocommunication stimuli.

<p><b>A)</b> Schematic showing a fish with stimulation electrodes on each side as well as a recording electrode from the midbrain region Torus semicircularis (TS). <b>B)</b> Responses of an example TS neuron to different chirp stimuli (black). The blue dots mark the occurrence of action potentials to 20 repeated presentations of the stimulus waveform (raster plot) and the red curve shows the firing rate response averaged over trials (PSTH). Note the similarity in the response to each waveform as the neuron fires at the chirp onset with one-two spikes in each case.