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Hollow mask illusion fails to fool schizophrenia patients
Date:4/6/2009

ing the illusion faces 99 percent of the time. By contrast, all 13 patients with schizophrenia could routinely distinguish between hollow and normal faces, with an average of only six percent mis-categorisation errors for illusion faces.

The results of the brain imaging analysis suggested that in the healthy volunteers, connectivity between two parts of the brain, the parietal cortex involved in top-down control, particularly spatial attention, and the lateral occipital cortex involved in bottom-up processing of visual information, increased when the hollow faces were presented. In the patients with schizophrenia, this connectivity change did not occur. These results suggest that patients with schizophrenia have difficulty coordinating responses between different brain areas, also known as 'dysconnectivity', and that this may contribute to their immunity to visual illusions. The research group is now investigating dysconnectivity in schizophrenia further, which will hopefully advance our understanding of this disorder.

Danai Dima, Hannover Medical School, says: "The term 'schizophrenia' was coined almost a century ago to mean the splitting of different mental domains, but the idea has now shifted more towards connectivity between brain areas. The prevailing theory is that perception principally comprises three components: firstly, sensory input (bottom-up); secondly, the internal production of concepts (top-down); and thirdly, a control (a 'censor' component), which covers interaction between the two first components. Our study provides further evidence of 'dysconnectivity' between these components in the brains of people with schizophrenia."

Dr Jonathan Roiser, UCL Institute of Cognitive Neuroscience, says: "Our findings also shed light on studies of visual illusions which have used psychomimetics drugs that mimic the symptoms of psychosis. Studies using natural or synthetic tetrahydrocannabinol (THC), the ingredient of cannabis resin r
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Contact: Jenny Gimpel
j.gimpel@ucl.ac.uk
44-207-679-9726
University College London
Source:Eurekalert

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