Abstract
The Responses of Single Units to Simple and Complex Sounds from the Superior Olivary Complex of the Guinea Pig
Highlights
The superior olivary complex consists of a group of auditory nuclei in the mammalian brainstem
Recordings were made from all main divisions of the superior olivary complex (SOC): the superior paraolivary nucleus (SPN), the medial nucleus of the trapezoid body (MNTB), the lateral superior olive (LSO) and the medial superior olive (MSO)
MNTB units showed a “primary-like” (PL) post-stimulus time histograms (PSTHs) shape or a “primary-like with notch” (PN) shape, and the characteristic three-component spike-waveform shape reported in other species (Figure 1A)
Summary
The superior olivary complex consists of a group of auditory nuclei in the mammalian brainstem. For the first time, the responses of single units in the guinea pig SOC to simple and complex sounds, including stimuli that can evoke a binaural pitch in humans. Human psychoacoustic studies have demonstrated striking “binaural pitch” phenomena These pitch percepts are produced by sounds that, presented to either ear on its own, evoked no pitch [1, 2]. One such example is dichotic repetition pitch (DRP), consisting of Gaussian noise with a small inter-aural time difference (ITD) [1]. We demonstrate neural correlates of binaural pitch in the temporal discharge patterns of single units in the MSO.
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