Difficulty of having profound scientific discussions with more than 2 or 3 people? I am a physicist and the other day, a friend of mine pointed out something that I had never noted explicitly before. This is an empirical observation, but it seems true to me, and it may raise a lot of questions about the current organization of research. I wonder whether this has already been documented and studied, either from the sociological or psychological points of view.

The observation is that fundamental discussions on physics (i.e. implying non-standard physics and epistemology) often occur in discussions involving at most 2 or 3 good friends (all being physicists). The more people you involve (5 or 6 good friends), the harder it is to speak about these subjects. It is not "explicit"; it is just a personal feeling that a kind of "social pressure" appears and tends to bring the discussion closer to "standard discussion subjects". And it seems to occur even if all possible subgroups of 2 or 3 people among the global group of 5 or 6 people are OK with having fundamental discussions on physics when they are isolated from each other.

My questions are:


Is this a well-known effect? (Any links to studies?)
What is its origin?
How to avoid it?
It seems to be related to a kind of "Peer pressure".

This is due the change of the context. A profound discussion is regarded as confidential talk and you will notice that the voice volume is lower than a discussion with many people.

But why is a profound discussion regarded as confidential?

Maybe because you could touch scientific taboos. Every time you touch the foundation of a world view you will confront all participants with their fears. The world view represents a aspect of security. Exposing lacks in a world view will expose the fears of them too. Then it's much more difficult to find a common ground for a solution. Not everybody is willed to accept the implication of a certain insight.

A discussion with more people will tend to go towards superficial topics, cars, home, family, weather and so on.

But it depends on who initiate the talk and if this person is keen enough to enforce this topic. And I think that Keegan is right, sometimes we just want to be polite and we want the discussion to be more open ... maybe more open to the "general context" of the situation itself.