title: Long-Lasting Sound-Evoked Afterdischarge in the Auditory Midbrain.
abstract: Different forms of plasticity are known to play a critical role in the processing of information about sound. Here, we report a novel neural plastic response in the inferior colliculus, an auditory center in the midbrain of the auditory pathway. A vigorous, long-lasting sound-evoked afterdischarge (LSA) is seen in a subpopulation of both glutamatergic and GABAergic neurons in the central nucleus of the inferior colliculus of normal hearing mice. These neurons were identified with single unit recordings and optogenetics in vivo. The LSA can continue for up to several minutes after the offset of the sound. LSA is induced by long-lasting, or repetitive short-duration, innocuous sounds. Neurons with LSA showed less adaptation than the neurons without LSA. The mechanisms that cause this neural behavior are unknown but may be a function of intrinsic mechanisms or the microcircuitry of the inferior colliculus. Since LSA produces long-lasting firing in the absence of sound, it may be relevant to temporary or chronic tinnitus or to some other aftereffect of long-duration sound.
authors: Department of Neuroscience, University of Connecticut Health Center, Farmington, CT, USA 06030-3401.|Department of Physiology, Kanazawa Medical University, Ishikawa 920-0293, Japan.
authors: Munenori
authors: M
authors: Ono
authors: Department of Neuroscience, University of Connecticut Health Center, Farmington, CT, USA 06030-3401.
authors: Deborah C
authors: DC
authors: Bishop
authors: Department of Neuroscience, University of Connecticut Health Center, Farmington, CT, USA 06030-3401.
authors: Douglas L
authors: DL
authors: Oliver
mesh_terms: D000818:Animals; D001306:Auditory Pathways / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology*; D001309:Auditory Threshold; D059330:GABAergic Neurons / Q000378:metabolism; D007245:Inferior Colliculi / Q000502:physiology; D008636:Mesencephalon / Q000502:physiology*; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D013016:Sound