Showing posts with label detail. Show all posts
Showing posts with label detail. Show all posts

Thursday, 3 November 2011

Vivid descriptions of faces 'don't have to go into detail'

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ScienceDaily (Oct. 21, 2011) — Celebrated writers such as Charles Dickens and George Eliot described characters' faces vividly without going into detail about their features, according to a research group led at Strathclyde.

Experts in literature, psychology, neurology and music suggested that vividness can be created not only by describing individual features, such as the eyes, nose or chin, but by the strength of readers' feelings about how a person is depicted.

These feelings may be triggered by the 'mirror neuron system,' in which people who see an action being performed have the same regions of the brain activated as are needed to perform the action itself- for example, by flinching when they see someone injured.

The researchers illustrated their theory by highlighting descriptions of characters in works by writers including Dickens, Eliot, Geoffrey Chaucer and Sir Walter Scott. They found that, in many cases, the face was not explicitly mentioned but that the scientific literature suggests this may be more beneficial for forming a vivid response to the description.

Dr Elspeth Jajdelska, a lecturer in Strathclyde's Faculty of Humanities & Social Sciences, led the research. She said: "Faces are something we perceive in a different way to other objects.

"Psychological research shows that we perceive and process them as a whole, not as a set of features, and while some literary descriptions of a face supply pieces of information to be assembled like a jigsaw puzzle, others may involve a holistic picture and an immediate response to what the author has described- these may not necessarily be accurate images, in terms of the face the author has in mind, but could still be very vivid.

"There is evidence to suggest that asking for a verbal description of a face can make it less easy for the face to be recognised and other research has called the effectiveness of the photofit identification technique into question- all suggesting that piece by piece descriptions of a face may not be the ideal way to communicate face information in words.

"However, a writer's description might produce a vivid response with only a partial description if it is also holistic, or draws on emotional qualities of the face."

One of the descriptions examined was of Bill Sikes, the character in Dickens' Oliver Twist, whose black eye is said to have "displayed various parti-coloured symptoms of having been recently damaged by a blow." The researchers suggested that this description could be more vivid than one which was more precise about the discolouration.

The researchers' theory defined 'vividness' in several ways, including: something belonging to a stimulus, such as a piece of text; an emotional experience produced by such a stimulus, or how realistic the mental images produced by text are.

Dr Steve Kelly, a Senior Lecturer in Psychology in Strathclyde's Faculty of Humanities & Social Sciences, was a research partner in the project. Researchers from the University of Oxford, the University of Edinburgh and Glasgow Caledonian University were also involved.

The research paper has been published in the journal Poetics Today.

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The above story is reprinted from materials provided by University of Strathclyde.

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Monday, 31 October 2011

New instrument helps researchers see how diseases start and develop in minute detail

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ScienceDaily (Oct. 21, 2011) — Researchers at Lund University can now study molecules which are normally only found in very small concentrations, directly in organs and tissue. After several years of work, researchers in Lund have managed to construct an instrument that 'hyperpolarises' the molecules and thus makes it possible to track them using MRI. The technology opens up new possibilities to study what really happens on molecular level in organs such as the brain.

Magnetic resonance imaging (MRI) is an established technique which over the years has made it possible for researchers and healthcare professionals to study biological phenomena in the body without using ionising radiation, for example X-rays.

The images produced by normal MRI are, to put it simply, pictures of water in the body, since the body is largely made up of water. MRI produces images of the hydrogen nuclei in water molecules. It can also be used to study other types of nuclei in many other interesting molecules. The only problem is that the concentration of molecules that are interesting to track is so low that they are not visible on a normal MRI scan. It is this problem that the researchers have now solved by constructing a 'polariser'.

In the polariser, the researchers make these molecules visible to the MRI scanner by hyperpolarising them. The molecules are then injected into their natural body tissue.

"Then we can follow the specific molecule and see the reactions in which it is involved. This gives us a unique opportunity to see and measure enzymatic reactions directly in the living tissue," explains Professor Deniz Kirik.

The technology could be used to study molecules in many different types of tissue in the body. Deniz Kirik, who is a Professor of Neuroscience, will focus on developing this technology to study the brain -- something which has not been done before.

"The brain is not an easy target!" he observes. "When we look inside the brain today using MRI, we see the molecules that are most numerous. However, it is rarely these common molecules we want to study. We want to study how molecules that have a low concentration in the tissue behave, for example how signal substances are produced, used and broken down. It is when these processes don't work that we become ill.

"This technology has the potential to help us do just that. If we can make it work, it will be a breakthrough not only for neuroscience but also for other research fields such as diabetes, cancer and inflammation, where similar obstacles limit our understanding of the basic molecular processes which lead to disease."

Professor Hindrik Mulder is one of the co-applicants for the project and he will develop and use the technology in diabetes research. Dr Vladimir Denisov from the Lund University Bioimaging Centre is leading the technical development within the project.

At present there are only a few polarisers in the world and Lund's newly built device is the only one in Scandinavia to be fully available for academic research. "All the other equivalent instruments are purchased commercially and come with restrictions placed by the manufacturer. We therefore chose to take the longer and more complicated route of building the instrument ourselves," explains a pleased and proud Deniz Kirik.

Now that the instrument has become operational, the researchers have started on the first experiments.

"This is the first of two steps," says Deniz Kirik. "The next step in this frontline research is to develop the unique technology by constructing an even more sophisticated polariser which will enable advanced experiments on animal models for various diseases."

The project has been made possible through a grant from the Swedish Research Council and earlier grants from the Swedish Foundation for Strategic Research.

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