You stop at a shop window and wonder why someone inside is blatantly staring at you — until you realize this person is you. Scenarios like this are impossible for us to imagine, but quite common for sufferers of acquired prosopagnosia (AP), a condition which can occur after brain damage, hindering the ability to recognize faces.
In a new study published in the March 2010 issue of Elsevier's Cortex (http://www.elsevier.com/locate/cortex), researchers have found that the condition is linked to an inability to process faces as a whole, or holistically.
Meike Ramon and Dr Bruno Rossion from the Université de Louvain in Belgium have been investigating the case of PS, a 59 year-old kindergarten teacher and one of the few cases of pure acquired prosopagnosia in the world. She has been suffering from AP since having sustained closed head injury in 1992. Past accounts of the condition have focused on AP sufferers' difficulty in processing the eye-region of a face, or perceiving relative distances between facial features. In their new study, Ramon and Rossion found that both impairments are linked to a common cause: the inability to process faces as a whole.
Participants in the study were asked to match images of faces, which had been manipulated to differ either in a single feature or the distance between two features. As expected, the patient PS had difficulty in the matching task when changes to the faces occurred randomly. Strikingly, however, when told which feature had been changed (e.g. distance between the eyes), her performance profile paralleled that of healthy subjects.
The findings suggest that AP patients are unable to process different elements of the face in parallel and instead "apply a locally restricted, serial processing style, which is particularly inefficient for certain types of information." Knowing which information to look for makes this strategy relatively more efficient. While this may not help AP patients in real-life situations, "it does however shed light on what makes normal face recognition so overwhelmingly efficient: our capacity to simultaneously integrate the multiple facial elements into a unique representation", commented Ramon.
Notes to Editors:
The article is "Impaired processing of relative distances between features and of the eye region in acquired prosopagnosia - Two sides of the same holistic coin?" by Meike Ramon and Bruno Rossion and appears in Cortex, Volume 46, Issue 3 (March 2010), published by Elsevier in Italy. Full text of the article featured above is available to members of the media upon request. Please contact the Elsevier press office, email@example.com. To schedule an interview, contact Meike Ramon, firstname.lastname@example.org.
Cortex is an international journal devoted to the study of cognition and of the relationship between the nervous system and mental processes, particularly as these are reflected in the behaviour of patients with acquired brain lesions, normal volunteers, children with typical and atypical development, and in the activation of brain regions and systems as recorded by functional neuroimaging techniques. It was founded in 1964 by Ennio De Renzi. The Editor in-chief of Cortex is Sergio Della Sala, Professor of Human Cognitive Neuroscience at the University of Edinburgh. Fax: 0131 6513230, e-mail: email@example.com. Cortex is available online at http://www.sciencedirect.com/science/journal/00109452
Elsevier is a world-leading publisher of scientific, technical and medical information products and services. The company works in partnership with the global science and health communities to publish more than 2,000 journals, including The Lancet (www.thelancet.com) and Cell (www.cell.com), and close to 20,000 book titles, including major reference works from Mosby and Saunders. Elsevier's online solutions include ScienceDirect (www.sciencedirect.com), Scopus (www.scopus.com), Reaxys (www.reaxys.com), MD Consult (www.mdconsult.com) and Nursing Consult (www.nursingconsult.com), which enhance the productivity of science and health professionals, and the SciVal suite (www.scival.com) and MEDai's Pinpoint Review (www.medai.com), which help research and health care institutions deliver better outcomes more cost-effectively.
A global business headquartered in Amsterdam, Elsevier (www.elsevier.com) employs 7,000 people worldwide. The company is part of Reed Elsevier Group PLC (www.reedelsevier.com), a world-leading publisher and information provider, which is jointly owned by Reed Elsevier PLC and Reed Elsevier NV. The ticker symbols are REN (Euronext Amsterdam), REL (London Stock Exchange), RUK and ENL (New York Stock Exchange).
Valeria Brancolini | EurekAlert!
Drone vs. truck deliveries: Which create less carbon pollution?
31.05.2017 | University of Washington
New study: How does Europe become a leading player for software and IT services?
03.04.2017 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
23.06.2017 | Physics and Astronomy
23.06.2017 | Physics and Astronomy
23.06.2017 | Information Technology