Fruit flies evasive move back to the sensory neurons
When larvae of the fruit are full or are pushed, they say back and Corkscrew fall around her body, a behavior that seems to move the equivalent of judo young insects, researchers reporting online in the journal Current Biology, a publication of Cell Press. Now you have proof that the behavior of neurons similar to those of the current sense of pain. The larvae show the same behavior when attacked by rolling a small parasitic wasps, the new report also shows, sometimes even succeeds, the attacker on the back back.These wasps lay their eggs inside fly larvae. When the eggs hatch, the wasp larvae eat the young fly from the inside.We have identified a specific set of sensory neurons in the fly larva, whose function is to protect the animal from harmful things in the
environment, said Daniel W. Tracey Duke University Medical Center. These neurons resemble our own sensory neurons that trigger painful sensations when we encounter potentially harmful tissue from heat, mechanical or chemical stimuli. However, Tracey said, they really do not think that insects feel pain. On the contrary, reveals that the larval nervous system has circuitry that encodes an innate avoidance behavior - probably more like a reflex, as is the case when a person touches a hot stove.In this case, moving the hand away before the pain is actually felt.The researchers found that noxious heat or mechanical stimulation caused by the early deployment of the larvae, a completely different movement of the insects otherwise use to get around. In the new study, Tracey group
used a genetic trick to activate neurons and down by pulses of blue light. This allowed them to concentrate in specific sensory neurons resulting from the escape behavior - they are beautiful, highly branched nerve endings just beneath the outer surface of the larvae. Surprisingly, the larvae initially roll toward the warmth of delinquency or sting, they found.This led to the hypothesis that the movement was a defense against Pages: [1] 2