Medically healthy individuals who have higher intelligence generally tend to be more open to new experiences and ideas
People with high intelligence are able to think about information differently from than their own perspective, and possibly adjust how they see things.
Not everyone with a high IQ will like their office to be a wreck, but repeated research has shown that people with high intelligence tend to have more cluttered spaces.
Research has also correlated high intelligence with being a night owl.
You don't have to be a nervous nelly to be a brain, but anxiety can be a sign that you have a generous intelligence level.
Research has shown that if you tend to retain information well, it can be a sign of high intelligence.