A new study by researchers at UC Davis found that people born in the 1970s had brains that were both 6.6% larger in volume and 15% larger in surface area than people born in the 1930s.

Bigger brains could increase so-called “mental reserve,” potentially reducing the overall risk of age-related dementia, according to the study. They could even help explain the recent decrease in the amount of people affected by Alzheimer's.

For more on this, KCBS Radio news anchor Holly Quan spoke with Professor Prashanthi Vemuri, neuroimaging scientist at the Mayo Clinic