electrical tracking systems

I found this article on http://www.jyi.org/news/nb.php?id=905 JYI, Inc. is a exciting, student-led initiative to broaden the scope of the undergraduate scientific experience. The experiment sounds quite interesting. The evolution of the mono-fin is apparently to minimize distortion if the fishes body while swimming (tis is one theory anyway) – and this suggests that it can also compensate for the swaying movements of plants purely through sensory response?

“Electric” Fish Illuminate How Brain Directs Movement
“Two properties of the fish, called glass knifefish, made them ideal for motion studies. First, the nocturnal fish “see” in the dark by emitting weak electric signals and gathering feedback through special electroreceptors in their brain cells. Second, the fish are capable of moving back and forth in a small tube, a behavior crucial to the study design.

The researchers used robotics to move a small plastic tube back and forth with increasing frequency. The fish, which used the tube as a hiding place, performed an electrical tracking technique to stay hidden in the tube as it moved. But the fish could only process the speed of the moving tube below a frequency of one motion per second (1Hz), a quality scientists describe as “low-pass” since receptors in brain cells only detect frequencies lower than a certain limit.

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