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It takes nerves for flies to keep a level head
Date:7/21/2008

The nerve connections that keep a fly's gaze stable during complex aerial manoeuvres, enabling it to respond quickly to obstacles in its flight path, are revealed in new detail in research published today (22 July 2008).

Scientists from Imperial College London have described the connections between two key sets of nerve cells in a fly's brain that help it process what it sees and fast-track that information to its muscles. This helps it stay agile and respond quickly to its environment while on the move.

The study, published in the journal PLoS Biology, is an important step towards understanding how nervous systems operate, and could help us improve our knowledge of more complex animals. It could also be used to improve technical control systems in autonomous air vehicles - robots that stay stable in the air without crashing and with no need for remote control.

Just as goalkeepers need to keep their heads level when flying through the air for a save, no matter how they tilt their bodies, so flies need to keep their gaze steady during their slightly more complicated areal manoeuvres. This enables them to process visual information about their surrounding environment more efficiently and modify their movements accordingly.

The new research shows that the way in which two populations of nerve cells, or neurons, communicate with each other is the key. The lobula plate tangential cells receive input from the eyes. This generates small electrical signals that inform the fly about how it is turning and moving during its aerial stunts.

The signals pass on to a second set of neurons that connect to the neck muscles, and stabilise the fly's head and thus its line of sight.

Lead researcher, Dr Holger Krapp, from Imperial's Department of Bioengineering says the pathway from visual signal to head movement is ingeniously designed: it uses information from both eyes, is direct, and does not require heavy com
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Contact: Colin Smith
cd.smith@imperial.ac.uk
44-020-759-46712
Imperial College London
Source:Eurekalert

Page: 1 2

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