Posted on 01/03/2006 12:18:02 PM PST by doc30
Mixed chicks sing song of a different species Bird brains hardwired to learn own songs
By ANNE MCILROY
McGill University researcher Evan Balaban performs brain transplants on chickens to make them sing like quails. He takes bits of brain from quail embryos and attaches them to the brains of embryonic chickens still snug in their eggs.
When they hatch, the chickens look normal, except for the dark, quail-coloured feathers sprouting out of their heads. But they do not sound normal. Instead of crowing the classic cock-a-doodle-doo, they sing the two introductory notes and the long trill of a quail song.
"They actually sing like quails," he said.
Dr. Balaban, who recently moved to Montreal's McGill from the United States, is not trying to create feathered Frankenstein monsters. His chimeras, as the quail-chicken combos are known, are a tool for learning how brains are programmed to play a role in particular behaviours.
What makes roosters crow and quails sing?
In the past, researchers believed that birds learned their songs from their parents and other birds in their communities.
But studies have shown that bird brains appear to be hardwired to learn the songs of their own kind. Baby birds hatched in a laboratory and exposed to recordings of the songs of more than one species learn and retain their own songs at a much higher rate.
The same process may be at work with human infants, who even as newborns are attracted to the sounds of speech. No one understands how this works.
Dr. Balaban and his colleagues decided that brain transplants were a good way to find out. He does not believe the surgery, as it is now performed, would work in humans. In the future, however, it may help surgeons use donor cells from other species; for example, grafting brain cells taken from pig embryos to the brains of people with neurological disorders such as Parkinson's disease.
Dr. Balaban spent 12 years perfecting the chicken-to-quail brain transplant. He is establishing his new lab, and soon will be teaching graduate students in Montreal how to perform the surgery.
Using a wee pair of scissors, he cuts tiny windows in the eggshells. Then he switches to micro-scalpels made out of stainless-steel wire he sharpens under a microscope. He removes chicken brain cells and replaces them with quail brain cells.
By the process of elimination, he and his colleagues in the United States identified a small group of cells that made quails sing like quails. The scientists have also isolated the cells responsible for the bobbing head movements that quails make when they sing, and even for a particular, frantic sound quail parents make when warning their offspring of danger.
Chicken brains are bigger, so it is easier to perform the brain transplants on them. Chickens normally have white or yellow feathers. They sprout black and brown quail-coloured feathers because the transplant includes cells that determine the skin and feather pigmentation.
After the surgery, the chickens hatch and grow for two weeks before their bodies reject the quail cells.
That gives Dr. Balaban little time to figure out what is going on. He has not detected many physical differences between the quail brain cells and the chicken brain cells. The two birds, after all, are closely related.
But he is hoping that high-resolution brain-imaging equipment, designed specially for tiny animals, will help him understand what happens after the transplant, but before the birds hatch. He uses the scans to compare normal chicken brains with those that have had the transplant.
There are indications that the quail song is not embedded in the quail brain cell like a computer chip; change the chip and you change the song. It is more complicated than that. The quail cells seem to send out signals, chemical cues that tell the embryonic chicken brain to build a particular circuit of cells responsible for the quail song.
He is hoping to learn how the quail song circuit is connected to the rest of the brain, and how long before hatching can the brain tell the difference between songs.
I'm all about the love, baby! ;)
My first reaction was -- sounds tasty.
Oh I thought this was a story about The Dixie Chicks. How's their career going since they trashed the President?
What's next?
So are they able to spell "potatoes" then or not?
That man has a big cock!
LOL
I am not going to say anything
I am not going to say anything
Pagin Col. Sanders, paging Col. Sanders, please pick up the white courtesy phone.
See post 28. It said what you were thinking.
Greatest Robot Chicken EVER!: The Scooby Doo where Velma is the last one living and does the nasty with old man Withers.
Who??
haha
Hmmm...no mention of PETA in the article. Are they planning to smear chicken $hit all over the Mad Doc's lab soon?
LOL!
Click The Dixie Chicks Logo.You're Gonna Love It!
That's a Promise. It's Too Good!
Click the Pic
Since all he is doing is implanting part of a quails brain into a chicken brain, how does he get the vocal cords to change or different feathers to grow? Sounds phony to me, could be he is doing what that Korean guy did, making phony evidence to get his name in the books.
You should see my...............chicken!
:-) I will have to wait until after work. Thanks for the link.
chicken torturer scientist barf alert
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