Participants shared their opinions on certain topics & thoughts on the others’ opinions
They not only believed their opinions to be widepread, but made neative assumptions about those that disagreed
We assume that what we believe and feel are the same as what everyone else believes and feels
See the full study here :
Ross, L., Greene, D., & House, P. (1977). The “false consensus effect”: An egocentric bias in social perception and attribution processes. Journal of experimental social psychology, 13(3), 279-301, https://doi.org/10.1016/0022-1031(77)90049-X