Originally Posted by Ryzorian
He couldn't explain this behavior, but found it interesting.
Group dynamic studies would tend to verify what that Babylon 5 experiment showed, though not quite as pronounced. One thing that enhanced his results is that actors who work on similar roles or together in scenes, as these did, tend to socialize on set with the same people they are with in the scenes. This skewed his results, but the underlying assumption is valid.
Humans are more comfortable with those they perceive to be most like themselves, whether it be visual, language or mannerisms. There are anomallies (like myself) whose curiosity or attraction to the unknown override that basic response, but even then the response still happens, we just suppress it.