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Related Experiment Video

Updated: Feb 16, 2026

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

Published on: December 8, 2023

Spatial Information in a Non-retinotopic Visual Cortex.

Julien Fournier¹, Christian M Müller¹, Ingmar Schneider¹

¹Max Planck Institute for Brain Research, Department of Neural Systems, Max von Laue Str 4, 60438 Frankfurt am Main, Germany.

|December 19, 2017

Summary

This summary is machine-generated.

The turtle dorsal cortex (dCx) processes visual information globally, unlike the local processing in mammals. This reptilian brain area analyzes natural images and shows position-specific adaptation, indicating a unique visual processing strategy.

Keywords:

Bayesian decoding adaptation brain evolution dLGN extracellular recording oscillation receptive field reptile vision

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Last Updated: Feb 16, 2026

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

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Published on: December 8, 2023

Topographical Estimation of Visual Population Receptive Fields by fMRI

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Published on: February 3, 2015

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

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Published on: August 1, 2018

Area of Science:

Neuroscience
Comparative Cognition
Visual Processing

Background:

The turtle dorsal cortex (dCx) is a three-layered reptilian cortical area.
It receives retinal input via the thalamic lateral geniculate nucleus, serving as the initial cortical visual processing stage.
dCx neurons typically have receptive fields covering the entire contralateral visual field.

Purpose of the Study:

To investigate the spatial structure sensitivity and visual space representation in the turtle dorsal cortex (dCx).
To compare visual processing in the turtle dCx with mammalian primary visual cortex.

Main Methods:

Electrophysiological recordings were performed in awake and anesthetized turtles.
Analysis focused on neuronal responses to natural images and repeated stimulation.

Main Results:

The dCx is sensitive to the spatial structure of natural images.
dCx receptive fields exhibit non-uniformity across space.
Neuronal adaptation to visual stimuli is position-specific.
Spatial information is present at both single-neuron and population levels.
Anatomical data suggest a lack of clear retinotopic mapping.

Conclusions:

The turtle dorsal cortex (dCx) performs a global analysis of visual scenes, differing from the local analysis in mammalian primary visual cortex.
Visual space mapping and representation in the dCx are distinct from mammalian systems.