Intrinsic properties of avian interaural level difference sound localizing neurons.
Title
Intrinsic properties of avian interaural level difference sound localizing neurons.
Creator
Curry RJ; Lu Y
Publisher
Brain Research
Date
2021
2021-01-07
Description
Intrinsic properties of neurons are one major determinant for how neurons respond to their synaptic inputs and shape their outputs in neural circuits. Here, we studied the intrinsic properties of neurons in the chicken posterior portion of the dorsal nucleus of the lateral lemniscus (LLDp), the first interaural level difference (ILD) encoder of the avian auditory pathway. Using whole-cell recordings in brain slices, we revealed that the LLDp is composed of a heterogeneous neuron population based on their firing patterns. LLDp neurons were broadly classified as either phasic or tonic firing neurons, with further classification applied to tonic firing neurons, such as regular (most dominant, n=82 out of 125 cells, 65.6%), pauser, or adaptive firing. Neurons with different firing patterns were distributed about evenly across the dorsoventral as well as mediolateral axis of LLDp. Phasic firing neurons were of faster membrane time constant, and lower excitability than tonic firing neurons. The action potentials (APs) elicited at the current thresholds displayed significant differences in first spike latency, AP peak amplitude, half-width, and maximal rising and falling rates. Interestingly, for APs elicited at suprathreshold currents (400 pA above thresholds), some of the differences diminished while a few others emerged. Remarkably, most parameters of the APs at thresholds were significantly different from those of APs at suprathresholds. Combined with our previous study (Curry and Lu, 2016), the results lend support to the two-cell type model for ILD coding in the avian system.
Subject
action potential; interaural level difference; intrinsic property; posterior portion of the dorsal nucleus of the lateral lemniscus
Identifier
Rights
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
Format
journalArticle
URL Address
Search for Full-text
Users with a NEOMED Library login can search for full-text journal articles at the following url: https://libraryguides.neomed.edu/home
Pages
147258
ISSN
1872-6240 0006-8993
NEOMED College
NEOMED College of Medicine
NEOMED Department
Department of Anatomy & Neurobiology
Update Year & Number
January 2021 List
Citation
Curry RJ; Lu Y, “Intrinsic properties of avian interaural level difference sound localizing neurons.,” NEOMED Bibliography Database, accessed February 13, 2025, https://neomed.omeka.net/items/show/11495.