Reminds me of a complementarity I sometimes see between being in society, which allows to share, collaborate, etc., and being in solitude, which allows to think

Reminds me of a complementarity I sometimes see between being in society, which allows to share, collaborate, etc., and being in solitude, which allows to think, contemplate, etc., and of a south american indigenous tribe I forgot the name of, where the elders somehow transcend this opposition: for important deliberations, they gather in a dark hut and whisper their views, for those who speak not to be identified, as if they formed a single mind. I would appreciate if anyone could remind me the name of this tribe.