A thought-provoking list was published by Business Insider that summarizes some science-based commonalities between smart people. Certainly, this is the perfect place to mention that correlation doesn't imply causation. Surprising signs of intelligence include better rhythm, liking dark humour, being prone to worry, sleeping late and more…
  • No. 1 - Daydreamer
Being a daydreamer is a sign that you are intelligent and creative, new research concludes. The result comes from a study in which over 100 people had their brains scanned while they stared at a fixed point for five minutes.



The researchers wanted to see how their brains worked in unison when they were given nothing in particular to do. People whose brains worked more efficiently had greater intellectual abilities and also reported more daydreaming in their everyday lives.
  • No. 2 - Appreciating dark humour
People who appreciate dark humour are likely to be more intelligent, research finds. Those who prefer twisted comedy also score higher on tests of emotional stability.



To get twisted humour, it seems you need to be laidback and clever. The reason intelligence may be linked to appreciating dark humour is that it can take a little work.
  • No. 3 - Stronger perceptual skills
People with high IQs have stronger basic perceptual skills, research finds. For example, they can tell which way objects are moving more quickly.



They are also better at blocking out background information to make their judgement. A higher IQ makes the brain faster at a fundamental level.
  • No. 4 - Worry
People of high intelligence are more prone to anxiety than those of moderate intelligence.



Indeed, anxiety may have co-evolved with intelligence — worrying may have given early humans a survival benefit in the ancient past. It’s just a pity that it’s left intelligent people with higher levels of anxiety disorders.
  • No. 5 - Larger pupils
People with larger pupils have higher intelligence and the difference is visible to the naked eye, research finds. A larger pupil size reflects both a higher fluid intelligence and a greater working memory capacity.



The pupils are the black part at the centre of the eye which dilate in response to changes in light. Psychologists have found they also respond to brain activity: the faster our brains are working, the more the pupil widens.
  • No. 6 - New ideas
Set against the higher levels of mental illness and anxiety, is the fact that one of the signs of intelligence is being more likely to come up with new ideas. Historically, that might mean rejecting superstition and finding new ways of organising society.



One study argues that this explains why more intelligent people are more likely to be atheists and more likely to be politically liberal. This study found that young adults who described themselves as ‘very conservative’ had an average IQ of 95, while those who described themselves as ‘very liberal’ had an average IQ of 106.
  • No. 7 - Loners
The more that intelligent people socialise with their friends, the less satisfied they are with life, recent research finds. The finding challenges the accepted idea that socialising generally makes people happier.



It may be that for some people — especially those with high intelligence — socialising does not increase life satisfaction.
  • No. 8 - The very bright sleep late
Another of the signs of intelligence is going to bed later and getting up later.The study examined the sleep habits of 20,745 adolescent Americans and found that on a weekday the ‘very dull’ went to bed at an average of 11:41 and woke up at 7:20.



In contrast, the ‘very bright’ went to bed at 12:29 and got up at 7:52. At the weekend the differences were even more pronounced.
  • No. 9 - Trusting
Intelligent people are more likely to trust others, according to a new analysis of US public opinion poll data. This may be because more intelligent people are better judges of character.



They found that people who were more trusting were also happier and had higher levels of physical health.
  • No. 10 - Laziness
Lazy people are more likely to enjoy thinking, new research finds. On the other hand, those with who don’t enjoy it need to ‘do more stuff’ in order to escape their own thoughts.



Previous studies have found that people who like to think more have better memories and often take more time to make decisions and end up making better ones.

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