There have been lots of studies throughout the years in regards to what might make a person more or less intelligent than the rest. While some of these studies are a bit confusing a lot of them seem to really put things into perspective.
In the past few decades, it seems many have been looking into the link between neuroticism and lower IQs as it seems those with this trait tend to score much lower on tests. One study from back in 2012 actually found that the genetic correlation between IQ and neuroticism was quite prominent. They noted that low neuroticism and high agreeableness contributed to higher IQ scores.
They wrote as follows within their abstract:
IQ is positively correlated with agreeableness and openness to experience. ► IQ is negatively correlated with neuroticism. ► Genetic factors explain nearly half of these associations. ► Genetic correlations were 0.3–0.4 between IQ with agreeableness and openness. ► Genetic correlations were −0.18 between IQ with neuroticism.
For those who might not quite be sure neuroticism is one of the Big Five higher-order personality traits when it comes to psychology. People with this trait or who score as having higher levels of it are more likely to be moody, depressed, frustrated, worried, anxious, and so forth. They are not necessarily as grounded as those with lower levels. Neuroticism is not fun and it really plagues a lot of people.
For the study mentioned above hundreds of Dutch twins were given personality and IQ tests. Through this researchers were able to assess their intelligence levels, test-taking abilities, and their personalities in general. While some argue their findings might not be as clear-cut as they seem the information is still there.
What do you think about this? Could the neuroticism be holding these people back or is it some kind of fluke? Surely more testing in regards will be done in the future, only time will tell. For more information on the Big Five feel free to check out the video below.