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Eye movement differs in British and Chinese populations
Date:3/24/2011

The team, working with Sichuan University in Chengdu, China, investigated eye movements in Chinese and British people to further understanding of the brain mechanisms that control them and how they compare between different human populations. They found that a type of eye movement, that is rare in British people, is much more common in Chinese people, suggesting that there could be subtle differences in brain function between different populations.

Tests of eye movements can be used to help identify signs of brain injury or disease, such as schizophrenia and multiple sclerosis, in populations across the world. Research at Liverpool, however, has shown that within the Chinese population there are a high proportion of healthy people that exhibit a pattern of eye movements previously thought to be rare in the absence of injury or disease. Findings, published in the journal Experimental Brain Research, suggest that this pattern may not be as effective as a signal of altered brain function, in every global community, as originally thought.

Working in China and in Britain, the team tested fast eye movements, called saccades. Participants in the study were asked to respond to spots of light with their eyes as they appeared suddenly to the right or left of their line of sight. The reaction time of the eye movements was the key measure that differentiated between Chinese and non-Chinese groups.

Dr Paul Knox, from the Institute of Ageing and Chronic Disease, explains: "In a person from any country in the world we would expect the reaction time of fast eye movements to be approximately a fifth of a second. Very rarely we find some people with eye movement reaction times that are much shorter than this, at around a tenth of a second. This, however, is usually assumed to be a sign of an underlying problem that makes it difficult to keep the eyes pointing where you would like for a long enough period.

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Contact: Samantha Martin
samantha.martin@liv.ac.uk
01-517-942-248
University of Liverpool
Source:Eurekalert

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