Inhibitory projections from the ventral nucleus of the lateral lemniscus and superior paraolivary nucleus create directional selectivity of frequency modulations in the inferior colliculus: a comparison of bats with other mammals.
This review considers four auditory brainstem nuclear groups and shows how studies of both bats and other mammals have provided insights into their response properties and the impact of their convergence in the inferior colliculus (IC). The four groups are octopus cells in the cochlear nucleus, their connections with the ventral nucleus of the lateral lemniscus (VNLL) and the superior paraolivary nucleus (SPON), and the connections of the VNLL and SPON with the IC. The theme is that the response properties of neurons in the SPON and VNLL map closely onto the synaptic response features of a unique subpopulation of cells in the IC of bats whose inputs are dominated by inhibition. We propose that the convergence of VNLL and SPON inputs generates the tuning of these IC cells, their unique temporal responses to tones, and their directional selectivities for frequency modulated (FM) sweeps. Other IC neurons form directional properties in other ways, showing that selective response properties are formed in multiple ways. In the final section we discuss why multiple formations of common response properties could amplify differences in population activity patterns evoked by signals that have similar spectrotemporal features.
Pollak
George D
GD
Section of Neurobiology, The University of Texas at Austin, Austin, TX 78712, USA. gpollak@mail.utexas.edu
Gittelman
Joshua X
JX
Li
Na
N
Xie
Ruili
R
D000161:Acoustic Stimulation; D000818:Animals; D001306:Auditory Pathways / Q000502:physiology; D001522:Behavior, Animal / Q000502:physiology; D002685:Chiroptera / Q000502:physiology*; D006309:Hearing / Q000502:physiology; D007245:Inferior Colliculi / Q000502:physiology*; D008322:Mammals / Q000502:physiology*; D020651:Ventral Thalamic Nuclei / Q000502:physiology*
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