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The brain of the fly -- a high-speed computer
Date:7/12/2010

. Although TN-XXL's luminance changes are much higher than that of former indicator molecules, it took quite some time to capture this comparatively small amount of light and to separate it from the LED-light impulse. After puzzling over this for a while, however, Dierk Reiff solved the problem by synchronizing the 2-photon-laser microscope with the LED-screen at a tolerance of merely a few microseconds. The TN-XXL signal could subsequently be separated from the LED-light and selectively measured using the 2-photon-microscope.

The cells behind the model

"At long last, after more than 50 years of trying, it is now technically possible to examine the cellular construction of the motion detector in the brain of the fly", reports a pleased Alexander Borst, who has been pursuing this goal in his department for a number of years. Just how much remains to be discovered was realized during the very first application of the new methods. The scientists began by observing the activity of cells known as L2-cells which receive information from the photoreceptors of the eye. The photoreceptors react when the light intensity increases or decreases. The reaction of the L2-cells is similar in that part of the cell where the information from the photoreceptor is picked up. However, the neurobiologists discovered that the L2-cell transforms these data and in particular, that it relays information only about the reduction in light intensity to the following nerve cells. The latter then calculate the direction of motion and pass this information on to the flight control system. "This means that the information "light on" is filtered out by the L2-cells", summarizes Dierk Reiff. "It also means, however, that another kind of cell must pass on the "light on" command, since the fly reacts to both kinds of signals."

Now that the first step has been taken, the scientists intend to examine - cell by cell - the motion detection circuitry in the fly brain to exp
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Contact: Stefanie Merker
merker@neuro.mpg.de
49-898-578-3514
Max-Planck-Gesellschaft
Source:Eurekalert  

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