In 2001, Terrence Kaufman presented linguistic evidence suggesting that an important ethnic group in Teotihuacan was of Totonacan or Mixe–Zoquean linguistic affiliation. He uses this to explain general influences from Totonacan and Mixe–Zoquean languages in many other Mesoamerican languages, whose people did not have any known history of contact with either of the above-mentioned groups. Other scholars maintain that the largest population group must have been of Otomi ethnicity because the Otomi language is known to have been spoken in the area around Teotihuacan both before and after the Classic period and not during the middle period.