An individual's personality appears to be linked partly to the size of different parts of the brain, new research from the University of Minnesota reveals.
Extroverts, for example, are generally more involved in the quest for rewards.
What the findings mean
Using a computer program to compare the relative sizes of different structures in each brain image, the authors noted that participants who described themselves as extroverted had a significantly larger medial orbitofrontol cortex - a part of the brain active in considering rewards. Perhaps not surprisingly, those self-described as conscientious had a bigger lateral prefrontal cortex - a section of the brain involved in planning and controlling behaviour.