Tag Archives: Ian Deary

Higher childhood IQ related to a lower risk mortality

3 Jul

The Lothian birth-cohort studies continue to contribute to our understanding of cognitive aging. Here is the latest paper, published in the journal Intelligence. And here are the paper’s highlights;

• 94% of the participants of the Scottish Mental Survey 1947 were traced.
• Higher childhood IQ was related to a lower risk of all-cause mortality by age 79.
• The effect was slightly stronger in women than in men.
• The decline in risk across categories of IQ scores was graded across the full range.
•This is the only study of IQ and mortality in an entire year-of-birth cohort.

Here is Ian Deary’s brief description of the Lothian birth-cohort studies

Age related cognitive decline is real

7 Mar

While we may be able to do some things to slow cognitive decline, a recent study published in the journal Intelligence reports evidence that age related cognitive decline is real:

“Processing speed is an important human cognitive capability that might underlie differences in other cognitive skills and their aging. We aimed to test aging-related processing speed differences using a novel cross-sectional design that adjusted for cognitive ability tested in youth. We examined aging differences on three different ways of assessing processing speed: psychometric, experimental, and psychophysical. We compared large narrow-age cohorts of 70- and 83-year-old people who were matched for cognitive ability in childhood. There were decrements of substantial effect size in all processing speed assessments in the older group that were not accounted for by prior cognitive ability, health, or fitness differences, though these factors also contributed to processing speed differences. These findings confirm age-related cognitive slowing using an unusual research design, and provide evidence against recent theories characterizing aging-related cognitive decline as a myth.”

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