Wide band inhibition of NM activity is evident following DNQX application in NM. Aa, Raster plots of one NM neuron activity for the various sound frequencies.

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Wide band inhibition of NM activity is evident following DNQX application in NM. Aa, Raster plots of one NM neuron activity for the various sound frequencies at 90 dB SPL (317–5702 Hz, vertically displaced at 1/6 octave steps) during perfusion of ACSF conta... Wide band inhibition of NM activity is evident following DNQX application in NM. Aa, Raster plots of one NM neuron activity for the various sound frequencies at 90 dB SPL (317–5702 Hz, vertically displaced at 1/6 octave steps) during perfusion of ACSF containing 20 μm DNQX into the fourth ventricle. Each dot represents one action potential. Ten trials were plotted at each sound frequency. The open bar on the bottom abscissa indicates the time of sound presentation (0–80 ms). At the onset of the sound stimulus of ∼1.5 kHz, excitatory responses were observed. However, during and after the sound presentation, the firing rate became lower than the spontaneous firing rate at most frequencies stimulated. Ab, The firing rate for onset (0–15 ms) and steady state (15–80 ms) of the sound presentation were measured and plotted against sound frequency. Thick dashed line indicates the spontaneous firing level. Thinner solid lines indicate the threshold level of excitation and inhibition (see methods for definition of threshold). The frequency range of the inhibition was broader than that of the onset excitation. Ba, Tuning curve for the excitation and inhibition. Threshold sound level for the excitation (closed circles) and inhibition (open diamonds) is plotted. The excitation plot was calculated from the onset (0–15 ms) and the inhibition plot was calculated from the steady state (15–80 ms). A and Ba are data from the same neuron. Bb, Inhibitory tuning of another example neuron in which the excitation response fell below the threshold level. Iwao Fukui et al. J. Neurosci. 2010;30:12075-12083 ©2010 by Society for Neuroscience