First thing’s first, I need to clear one (possible) misunderstanding: strictly speaking, IQ is correlated with introversion, not shyness. Someone who is shy will exhibit an unusually strong fear response towards social interaction, whereas an introvert might not; introverts simply prefer to be alone and get exhausted from being around too many people very quickly, without necessarily being scared of social interaction. Of course, shy introverts do exist – common, even – but talkative introverts, and shy extroverts for that matter, do exist as well. To the best of my knowledge, intelligent people do seem to be disproportionately introverted, but not necessarily shy.
With that out of the way, onwards with the rest of the answer – I shall list out a few interesting traits and behaviours which are at least seemingly affected by IQ:
- Obedience. More intelligent individuals are less likely to respect a higher power, as they are much quicker to question the competence or authority of their superiors than their peers – for the obvious reason that they are smart enough to notice the mistakes made by their superiors.
- Aggression. People falling between around 80 to 95 IQ points commit a disproportionate number of crimes. I suspect this is due to them being just smart enough to pull criminal acts off, but too dimwitted to fully consider the consequences of their actions. Not entirely certain on the causal link here, though.
- Speech. This is a big one – in fact, this is probably the quickest and most accurate metric by which you can estimate someone’s intelligence. A very intelligent person (say, above 120 IQ points) is likely to use more complex sentence structures and more sophisticated vocabulary than your average Joe. They are also more likely to use abstractions and hypotheticals as they communicate, and frequently expect their listeners to read between the lines. On the other hand, someone with a very low IQ (say, 80 and below) is likely to speak like Forest Gump: simple, direct sentences with little sophistication, and a nonexistent ability to read between the lines. Of course, there are a number of people who use complex words without actually knowing what they mean in an attempt to look more intelligent, but they usually won’t speak with a complexity comparable with someone who actually is smarter than average.
- Tidiness. This one I’m not so certain about, but supposedly highly intelligent individuals dont tend to bother tidying up their rooms or desks as much as their peers. I’m guessing this is because intelligent people are more able to keep track of everything in their own heads – they might even perform better when their senses are saturated, such as in a messy room or desk – and so they don’t feel the need to keep everything organized, whereas their less able peers do. I’m a little iffy about this one though, so take it with a pinch of salt.