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Related Experiment Video

Updated: Mar 5, 2026

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

Jörgen Kornfeld1, Sam E Benezra2,3, Rajeevan T Narayanan4,5,6

  • 1Max Planck Institute of Neurobiology, Martinsried, Germany.

Elife
|March 28, 2017
PubMed
Summary
This summary is machine-generated.

Researchers mapped the neural network of the zebra finch HVC, revealing how HVC(RA) neurons control song timing. The study found these neurons connect with inhibitory interneurons locally and other excitatory neurons, including HVC(RA) cells, at a distance.

Keywords:
birdsongconnectomicsneural sequencesneurosciencesynfire chainszebra finch

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Sequential neural activation is observed in many brain areas, but the underlying network structures remain poorly understood.
  • Understanding neural circuits is crucial for deciphering complex behaviors like vocalization sequencing.

Purpose of the Study:

  • To investigate the circuit anatomy of the HVC (HVC) region in zebra finches, a key area for generating song sequences.
  • To identify the specific cell types targeted by HVC(RA) neurons, which are critical for controlling the temporal progression of birdsong.

Main Methods:

  • Combined serial block-face electron microscopy with light microscopy.
  • Examined the synaptic targets of HVC(RA) neurons in the zebra finch brain.

Main Results:

  • HVC(RA) neuron axons primarily targeted inhibitory interneurons near their soma.
  • Axons targeted other excitatory neurons, including approximately 50% HVC(RA) cells, further from the soma.
  • These findings align with previous electrical recording data on paired-cell recordings.

Conclusions:

  • Neural sequences pacing birdsong are generated by global synaptic chains within HVC.
  • These chains are embedded within local inhibitory networks, providing a framework for temporal control.
  • The study elucidates the network architecture enabling precise temporal sequencing in a vocal control system.