A bigger brain alone can’t guarantee you a pass to the best jobs in the world as researchers have found that an increase in brain volume contributes very little to a person's intelligence and educational attainment.
The study, published in the journal Psychological Science, was based on MRI-derived information about brain size in connection with cognitive performance test results and educational-attainment measures obtained from more than 13,600 people.
The researchers found that a positive relationship does exist between brain volume and performance on cognitive tests, but size was far from everything -- explaining only about two per cent of the variation in smarts.
The findings suggest that factors like parenting style, education, nutrition, stress, and others are likely major contributors to one's smartness.