 The phonological features traditionally distinguishing informal Quebec French and formal European French have gradually acquired varying sociolinguistic status, so that certain traits of Quebec French are perceived neutrally or positively by Quebecers, while others are perceived negatively.Sociolinguistic studies conducted in the 1960s and 1970s showed that Quebecers generally rated speakers of European French heard in recordings higher than speakers of Quebec French in many positive traits, including expected intelligence, education, ambition, friendliness and physical strength.The researchers were surprised by the greater friendliness rating for Europeans, since one of the primary reasons usually advanced to explain the retention of low-status language varieties is social solidarity with members of one's linguistic group.