Their results show the brain is more flexible and versatile than the computer it is often likened to, and even may lead to new tests for blinding diseases such as glaucoma.
Previously it was thought that the brain’s ability to discern colour depends on a specialised nerve ‘colour channel’, but now, say researchers from The Vision Centre and Sydney University, it appears some colour-sensing cells can also signal movement.
“In this research we discovered that blue sensing cells not only can respond to black and white patterns, but surprisingly are even sensitive to the direction of pattern movement,” explains team leader Professor Paul Martin.
“In diseases like glaucoma, your colour vision is impaired. Now we have discovered that the colour cells can also sense black and white and movement, that gives us a new way of testing to see if the cells are healthy or not. Our colleagues in The Vision Centre include experts at designing tests for glaucoma, and they now have a new clue that may make their tests even more sensitive,” he adds.
The serendipitous finding happened when young researcher Maziar Hashemi-Nezhad decided to carry out an unplanned experiment that came up with a totally unexpected result.
“It was chance. Maziar was in the lab, late at night, and decided to see if he could get colour vision cells to respond to a moving black and white pattern – something which was considered most unlikely because the prevailing scientific view was they respond only to colour. He saw an immediate response,” Prof Martin says.
“This is an example of how ‘blue sky’ science may lead to a practical outcome. The goal of this work is not to study glaucoma, it is really all about trying to interpret the signals on the ‘fax line’ that connects the eyes to the brain – this discovery takes us one small step closer to understanding what is really going down the fax line,” he explains.
“For a long time we’ve had an image of the brain as a kind of computer, with particular pathways – or ‘wires’- for particular nerve signals. Now it is becoming clear the wiring is a lot less precise than a computer. But imprecise wiring is actually flexible because it creates many backup pathways to compensate for aging and damage,” Prof. Martin says.
The researchers’ paper “Receptive field asymmetries produce color-dependent direction selectivity in primate lateral geniculate nucleus” by Chris Tailby, William Dobbie, Samuel Solomon, Brett Szmajda, Maziar Hashemi-Nezhad, Jason Forte and Paul Martin has just appeared in the Journal of Vision (2010), Volume 10 (8), pages 1-18.
The Vision Centre is funded by the Australian Research Council as the ARC Centre of Excellence in Vision Science.More information:
Professor Paul Martin | scinews.com.au
New risk factors for anxiety disorders
24.02.2017 | Julius-Maximilians-Universität Würzburg
Stingless bees have their nests protected by soldiers
24.02.2017 | Johannes Gutenberg-Universität Mainz
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
24.02.2017 | Life Sciences
24.02.2017 | Life Sciences
24.02.2017 | Trade Fair News