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Sampling Blood from the Lateral Tail Vein of the Rat
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Nonlinear Processing of Shape Information in Rat Lateral Extrastriate Cortex.

Giulio Matteucci1, Rosilari Bellacosa Marotti1, Margherita Riggi1

  • 1Visual Neuroscience Laboratory, International School for Advanced Studies (SISSA), Trieste 34136, Italy, and.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 9, 2019
PubMed
Summary
This summary is machine-generated.

Rodent visual cortex shows homologous shape processing to primates. Neuronal responses in area LL exhibit increased tolerance to orientation changes, suggesting a shared ventral stream computation.

Keywords:
gratingorientation tuningphase sensitivityreverse correlationrodentventral stream

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Area of Science:

  • Neuroscience
  • Visual Processing
  • Comparative Cognition

Background:

  • Rodent extrastriate areas are anatomically linked to primate ventral stream object processing.
  • Previous studies suggest rodent visual cortex specialization for object identity despite view changes.

Purpose of the Study:

  • To investigate the computational basis of shape processing specialization in the rodent visual cortex.
  • To compare neuronal computations in rat primary visual cortex (V1) and area LL.

Main Methods:

  • Multielectrode recordings from V1 and area LL in adult male rats.
  • Presentation of drifting gratings and noise movies.
  • Analysis of neuronal entrainment, receptive field quality, and orientation tuning.

Main Results:

  • Neuronal responses showed decreased phase entrainment and receptive field quality from V1 to LL.
  • LL neurons exhibited increased response to varied orientations and reduced orientation tuning sharpness.
  • These changes align with nonlinear summation predicted by hierarchical ventral stream models.

Conclusions:

  • Rodent area LL demonstrates computational properties similar to the primate ventral stream.
  • Homology in shape selectivity and transformation tolerance mechanisms exists between rodent and primate visual cortices.
  • Rodents serve as valuable models for studying ventral stream circuitry and function.