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Fold Change Detection in Visual Processing.

Cezar Borba1, Matthew J Kourakis2, Shea Schwennicke3

  • 1Department of Molecular, Cell and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA, United States.

Frontiers in Neural Circuits
|September 9, 2021
PubMed
Summary
This summary is machine-generated.

Ciona larvae exhibit fold change detection (FCD) in visuomotor behaviors, processing visual input through distinct neural circuits in the posterior brain vesicle (pBV). These circuits, differing in architecture, suggest a common evolutionary origin with the vertebrate midbrain.

Keywords:
Cionaevolutionfold change detectionmidbrainvisuomotor

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Area of Science:

  • Neuroscience
  • Comparative Biology
  • Sensory Processing

Background:

  • The simple nervous system of Ciona larvae, a vertebrate relative, allows for detailed study of visuomotor behaviors.
  • Ciona larvae display two key behaviors: a looming shadow response and negative phototaxis, mediated by separate neural circuits.
  • Both circuits converge on the posterior brain vesicle (pBV), a central nervous system structure.

Purpose of the Study:

  • To investigate the neural mechanisms underlying Ciona larvae's visuomotor behaviors, specifically focusing on fold change detection (FCD).
  • To elucidate the circuit architectures responsible for distinct behavioral responses to visual stimuli.
  • To explore the evolutionary implications of the pBV's role in visual processing.

Main Methods:

  • Analysis of visuomotor behaviors (looming shadow response, negative phototaxis) in Ciona larvae.
  • Pharmacological modulation to identify the location of FCD circuits.
  • Examination of pBV interneuron connectivity and properties to infer circuit motifs.

Main Results:

  • Ciona larvae exhibit fold change detection (FCD), where responses scale with relative stimulus change, not magnitude.
  • Distinct stimulus/response relationships were observed: a power relationship for the looming shadow response and linear for negative phototaxis.
  • FCD circuits are located outside the ocellus, likely within the pBV, with differing circuit architectures (incoherent feedforward vs. non-linear integral feedback loops).

Conclusions:

  • The pBV processes visual inputs via distinct FCD circuits, generating specific behavioral outputs.
  • The identified circuit architectures in Ciona larvae provide insights into the evolution of visual processing.
  • The findings support the hypothesis of a common evolutionary origin between the Ciona pBV and the vertebrate midbrain.