Homogeneous and Narrow Bandwidth of Spike Initiation in Rat L1 Cortical Interneurons
| Autor: | Christophe Verbist, Michele Giugliano, Stefano Borda Bossana |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
noise Interneuron Population Sensory system interneuron Settore BIO/09 - Fisiologia lcsh:RC321-571 03 medical and health sciences Cellular and Molecular Neuroscience 0302 clinical medicine spike-triggered average medicine education lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry Original Research Physics education.field_of_study Neocortex Bandwidth (signal processing) Spike-triggered average 030104 developmental biology medicine.anatomical_structure Homogeneous Cellular Neuroscience layer 1 cortex GABAergic dynamical transfer function Human medicine Neuroscience 030217 neurology & neurosurgery |
| Zdroj: | Frontiers in Cellular Neuroscience Frontiers in Cellular Neuroscience, Vol 14 (2020) Frontiers in cellular neuroscience |
| ISSN: | 1662-5102 |
| Popis: | The cortical layer 1 (L1) contains a population of GABAergic interneurons, considered a key component of information integration, processing, and relaying in neocortical networks. In fact, L1 interneurons combine top-down information with feed-forward sensory inputs in layer 2/3 and 5 pyramidal cells (PCs), while filtering their incoming signals. Despite the importance of L1 for network emerging phenomena, little is known on the dynamics of the spike initiation and the encoding properties of its neurons. Using acute brain tissue slices from the rat neocortex, combined with the analysis of an existing database of model neurons, we investigated the dynamical transfer properties of these cells by sampling an entire population of known "electrical classes" and comparing experiments and model predictions. We found the bandwidth of spike initiation to be significantly narrower than in L2/3 and 5 PCs, with values below 100 cycle/s, but without significant heterogeneity in the cell response properties across distinct electrical types. The upper limit of the neuronal bandwidth was significantly correlated to the mean firing rate, as anticipated from theoretical studies but not reported for PCs. At high spectral frequencies, the magnitude of the neuronal response attenuated as a power-law, with an exponent significantly smaller than what was reported for pyramidal neurons and reminiscent of the dynamics of a "leaky" integrate-and-fire model of spike initiation. Finally, most of ourin vitroresults matched quantitatively the numerical simulations of the models as a further contribution to independently validate the models against novel experimental data. |
| Databáze: | OpenAIRE |
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