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Functional architecture for speed tuning in primary visual cortex of carnivores
Víctor Manuel Suárez Casanova1, Noah K Lasky-Nielson1, Lihanxi Ye1
1Department of Biology, Brandeis University, Waltham, MA 02454 USA.
Biorxiv : the Preprint Server for Biology
|November 24, 2025
Summary
The primary visual cortex (V1) contains functional architecture for speed tuning, with clustered speed-selective cells found in ferrets and cats. This organization is present in V1 itself, not just higher brain areas.
Area of Science:
- Neuroscience
- Visual Processing
- Sensory Systems
Background:
- Motion perception relies on detecting stimulus speed and direction.
- Primary visual cortex (V1) is organized by orientation, direction, and spatial frequency.
- Speed tuning organization in V1 is less understood than in higher visual areas like MT.
Purpose of the Study:
- Investigate the functional architecture of speed-tuned cells within V1.
- Examine joint tuning of V1 neurons for multiple visual properties.
- Determine if speed selectivity is organized within V1.
Main Methods:
- Multi-channel electrophysiology in anesthetized ferrets.
- Analysis of neural responses to visual stimuli.
- Reanalysis of intrinsic signal imaging data from cat V1.
Main Results:
- Significant clustering of speed-tuned cells and speed preference found within ferret V1 penetrations.
- Both simple and complex cells in V1 exhibit speed tuning.
- Cat V1 data revealed repeating "hot spots" of high speed selectivity.
Conclusions:
- V1 possesses an intrinsic functional architecture for speed tuning.
- This speed tuning organization is present in V1 and transmitted to downstream areas.
- Functional architecture for speed is not exclusive to higher visual areas.
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