Article seems pretty bad. It already starts of horrendously when they call the journal "ScienceDirect.com". That's just Elsevier's site. The journal is called "Personality and Individual Differences."

Furthermore, this is how the study assessed creativity:

> creativity was assessed with 10 items (e.g., “I have a vivid imagination”) from the International Personality Item Pool [...]. Participants rated the accuracy of the items as they applied to themselves on a 5-point scale (1 = Very inaccurate, 5 = Very accurate).

Meaning that they self-assessed how creative they currently feel. It was not measured how creative they actually are (though I wouldn't know how you could do that)

And these are the findings:

> shyness was related positively to both types of aggression, anxiety sensitivity, and social anhedonia, and was related negatively to creativity. Avoidance was related positively to both types of aggression and social anhedonia, and was related negatively to creativity. Of note, unsociability was related negatively to both types of aggression, and was related positively to creativity.

This directly contradicts the article's claims of "the character traits of 'shyness, avoidance, [and] unsociability' [...] are positively associated with creativity."

And, as others pointed out happiness != creative output as implied in the article: "Furthermore, intelligent people are happier when they have less social interaction, even with their friends"

So it seems like it's not as clear cut as they make it out to be.