EM connectomics reveals axonal target variation in a sequence-generating network.

Abstract:

:The sequential activation of neurons has been observed in various areas of the brain, but in no case is the underlying network structure well understood. Here we examined the circuit anatomy of zebra finch HVC, a cortical region that generates sequences underlying the temporal progression of the song. We combined serial block-face electron microscopy with light microscopy to determine the cell types targeted by HVC(RA) neurons, which control song timing. Close to their soma, axons almost exclusively targeted inhibitory interneurons, consistent with what had been found with electrical recordings from pairs of cells. Conversely, far from the soma the targets were mostly other excitatory neurons, about half of these being other HVC(RA) cells. Both observations are consistent with the notion that the neural sequences that pace the song are generated by global synaptic chains in HVC embedded within local inhibitory networks.

journal_name

Elife

journal_title

eLife

authors

Kornfeld J,Benezra SE,Narayanan RT,Svara F,Egger R,Oberlaender M,Denk W,Long MA

doi

10.7554/eLife.24364

subject

Has Abstract

pub_date

2017-03-27 00:00:00

issn

2050-084X

journal_volume

6

pub_type

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