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. 2010 Oct 27;30(43):14573–14584. doi: 10.1523/JNEUROSCI.2228-10.2010

Figure 2.

Figure 2.

Responses of a monaural neuron evoked by contralateral, ipsilateral, and binaural tones. A, Ipsilateral tones at 30 and 50 dB SPL evoked no discernible response. Binaural signals that had the same ipsilateral intensities, and were 10–30 dB more intense than the contralateral tones, did not change the spike count evoked by the contralateral signal presented alone. Responses were evoked at the resting membrane potential of −55 mV. B, The same stimuli as in A were presented, but the membrane potential was hyperpolarized from −55 to −73 mV. The hyperpolarization prevented the cell from discharging, and ipsilateral tones at 30 and 50 dB SPL did not evoke responses during hyperpolarization. C, Overlaid PSPs in bottom recordings show that ipsilateral tones had no effect on contralaterally evoked PSPs. Recordings on bottom right show overlaid EPSPs evoked by binaural tones with the two IIDs. Recordings on bottom left show that the contralaterally evoked PSP had the same magnitude and shape as the PSP evoked by the binaural signal in which the ipsilateral intensity was 50 dB SPL. Tone duration, 10 ms.