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A polysynaptic feedback circuit in rat visual cortex

R R Johnson1, A Burkhalter

  • 1Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 15, 1997
PubMed
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Feedback connections to the primary visual cortex (V1) activate excitatory networks. These networks amplify top-down signals, influencing visual attention and object recognition.

Area of Science:

  • Neuroscience
  • Visual System Research
  • Cortical Circuitry

Background:

  • Feedback connections from extrastriate cortex to primary visual cortex (V1) are crucial for top-down processing in visual attention and object recognition.
  • Previous studies suggest these feedback pathways preferentially target pyramidal cells and promote excitation in V1.

Purpose of the Study:

  • To investigate the polysynaptic circuits activated by feedback inputs from the lateromedial (LM) visual area to V1.
  • To understand how feedback connections modulate activity within V1 through local neuronal networks.

Main Methods:

  • Utilized a rodent model combining axonal tract tracing and anterograde degeneration for circuit analysis.
  • Employed biotinylated dextran amine (BDA) for retrograde transport to label dendrites of forward-projecting neurons.

Related Experiment Videos

  • Used postembedding immunogold labeling to identify GABAergic interneurons in electron microscopy.

    • Main Results:

    • Feedback connections provide strong monosynaptic input to forward-projecting neurons in V1.
    • These V1 neurons preferentially synapse with other pyramidal cells (approximately 97%), many of which are also forward-projecting.
    • Feedback-recipient forward-projecting neurons are densely interconnected, forming excitatory networks.

    Conclusions:

    • Feedback pathways directly target neurons involved in reciprocal forward connections within V1.
    • The identified excitatory networks likely amplify feedback activity.
    • These circuits provide a mechanism for top-down modulation of striate cortical activity.