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Hand Can't Be Fooled, Study Shows
March 11, 2008Beer-Sheva, Israel -- Research published in the March issue of Psychological Science, a journal of the Association for Psychological Science, is suggesting that we process images in two very distinct ways.
Ben-Gurion University of the Negev Psychologist Tzvi Ganel and his colleagues presented research participants with the "Ponzo" illusion, an image common in psychological research that makes two objects that are similar in length appear drastically different. They then hooked participants' index finger and thumb to computerized position tracking equipment and asked them to grasp the objects with their fingers.
Even thought the object appeared to be larger (or smaller) than it really was, the size of their grasp reflected the object's real rather than apparent size. For good measure, the researchers arranged the illusion so that the object that appeared to be the smaller of the two was actually the larger of the two.
As Ganel points out, these findings provide compelling support for what psychologists and neuroscientists describe as the "two visual systems hypothesis." According to this view, put forward more than a decade ago by Mel Goodale and David Milner, one system, -- vision-for-perception -- gives us our conscious visual experience of the world, allowing us to see objects in the rich context of the scenes in which they are embedded. It's also the one that is fooled by optical illusions.
The other system, vision-for-action, provides the visual control we need to move about and interact with objects. This system does not have to be conscious, but does have to be quick, goal-directed, and accurate - and as a consequence, is much less likely to be fooled by illusions such as the one used by Ganel and his colleagues.
"The idea of two visual systems in a single brain might seem initially counter-intuitive.After all, it seems obvious that it is the same subjective image that allows us both to recognize the coffee cup on our desk and to pick it up" writes Ganel. But this belief is an illusion, as the new research demonstrates.When there is a conflict between what we perceive and what is really out there in the world, it seems that it is our fingers have an advantage.
Association for Psychological Science
As Ganel points out, these findings provide compelling support for what psychologists and neuroscientists describe as the "two visual systems hypothesis." According to this view, put forward more than a decade ago by Mel Goodale and David Milner, one system, -- vision-for-perception -- gives us our conscious visual experience of the world, allowing us to see objects in the rich context of the scenes in which they are embedded. It's also the one that is fooled by optical illusions.
The other system, vision-for-action, provides the visual control we need to move about and interact with objects. This system does not have to be conscious, but does have to be quick, goal-directed, and accurate - and as a consequence, is much less likely to be fooled by illusions such as the one used by Ganel and his colleagues.
"The idea of two visual systems in a single brain might seem initially counter-intuitive.After all, it seems obvious that it is the same subjective image that allows us both to recognize the coffee cup on our desk and to pick it up" writes Ganel. But this belief is an illusion, as the new research demonstrates.When there is a conflict between what we perceive and what is really out there in the world, it seems that it is our fingers have an advantage.
Association for Psychological Science
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As we look at the world around us, images flicker into our brains like so many disparate pixels on a computer screen that change every time our eyes move, which is several times a second. Yet we don't perceive the world as a constantly flashing computer display.
Visual learning study challenges common belief on attention
A visual learning study by scientists at The University of Texas Health Science Center at Houston indicates that viewers can learn a great deal about objects in their field of vision even without paying attention. The findings will appear in the April 14 print issue of the journal Current Biology.
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Measuring Biodiversity and More: PLoS Biology Press Release
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EU Approves 1.75 Billion Euro Programme for IST Projects
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Ground-breaking research to develop 'conscious' robot
Researchers at the Universities of Essex and Bristol will soon be launching a ground-breaking project to develop a 'conscious' robot. The aim of the project, which involves computer scientists and neuropsychologists, is to advance the technology of intelligent machines, while also extending the understanding of human consciousness. Owen Holland, Senior Lecturer in Computer Science, who will lead the three-year project at Essex, explained: 'Consciousness is perhaps the last remaining mystery in understanding what it is to be human. By attempting to build physical systems which can produce a form of artificial consciousness, we hope to learn more about the nature of consciousness.' The proje
Nature press release for 10 January issue
LIFELINES: SHEEP AND BSE (DOI: 10.1038/nature709)
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