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Published on: March 10, 2011
Neural action fields for optic flow based navigation: a simulation study of the fly lobula plate network
1Department of Systems and Computational Neurobiology, Max-Planck-Institute of Neurobiology, Martinsried, Germany. borst@neuro.mpg.de
Plos One
|February 10, 2011
Summary
This study simulates fly optic flow processing in the lobula plate. Network simulations show that connectivity between tangential cells explains complex receptive fields crucial for visual navigation.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Insect Navigation
Background:
- Optic flow is vital for visual navigation across species.
- In flies, the lobula plate processes motion, featuring tangential cells with complex receptive fields.
- Existing studies suggest extensive connectivity between these cells forms their receptive fields.
Purpose of the Study:
- To simulate the network of lobula plate tangential cells in flies.
- To investigate how known connectivity shapes their receptive fields.
- To analyze how network interactions influence responses to ego-motion.
Main Methods:
- Developed a network simulation of 22 lobula plate tangential cells per hemisphere.
- Incorporated known connectivity patterns between these neurons.
- Model neurons received input from Reichardt-type motion detectors.
Main Results:
- Simulated neurons replicated the complex receptive fields of natural tangential cells.
- Each model neuron exhibited a distinct 'action field' tuned to specific ego-motion types.
- Intra-lobula plate connectivity primarily reduced sensitivity to translational movements.
Conclusions:
- The intrinsic connectivity of lobula plate tangential cells adequately explains their complex receptive field structure.
- The network architecture differentially shapes responses to rotational and translational ego-motion.
- This model provides insights into the neural basis of optic flow-based navigation in flies.
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