[alexvoda]

I understand what you are saying. I guess not all of are are affected by this. I guess at this point it's subjective. I understand why you might feel it's creepy.

As for the study, I believe you are referring to this: http://newsroom.ucla.edu/releases/friends-or-not-laughter-re... I have not read the article but I listened to the sound clips. They are definitely different. But I do not associate either with friends or strangers. If it were just these 2 clips I would probably identify them correctly because one is more involved and energetic and I know there is one of each kind. But I would probably find it more difficult to identify the type of each clip from a set without any extra knowledge.