London: People who are at a greater genetic risk of schizophrenia are more likely to see a fall in IQ as they age, even if they do not develop the condition, according to a study. Scientists at the University of Edinburgh say the findings could lead to new research into how different genes for schizophrenia affect brain function over time. They also show that genes associated with schizophrenia influence people in other important ways besides causing the illness itself. The researchers used the latest genetic analysis techniques to reach their conclusion on how thinking skills change with age. They compared the IQ scores of more than 1,000 people from Edinburgh who were tested for general cognitive functions in 1947, when the subjects were aged 11, and again when they were around 70 years old.
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