The Olmecs were the earliest known major civilization in Mexico following a progressive development in Soconusco. They lived in the tropical lowlands of south-central Mexico, in the present-day states of Veracruz and Tabasco. It has been speculated that the Olmecs derive in part from neighboring Mokaya or Mixe-Zoque. The Olmecs flourished during Mesoamerica's formative period, dating roughly from as early as 1500 BCE to about 400 BCE. Pre-

While the actual ethno-linguistic affiliation of the Olmec remains unknown, various hypotheses have been put forward. For example, in 1968 Michael D. Coe speculated that the Olmec were Mayan predecessors.  In 1976, linguists Lyle Campbell and Terrence Kaufman published a paper in which they argued a core number of loanwords had apparently spread from a Mixe-Zoquean language into many other Mesoamerican languages. Campbell and Kaufman proposed that the presence of these core loanwords indicated that the Olmec - generally regarded as the first "highly civilized" Mesoamerican society - spoke a language ancestral to Mixe-Zoquean. The spread of this vocabulary particular to their culture accompanied the diffusion of other Olmec cultural and artistic traits that appears in the archaeological record of other Mesoamerican societies.  Mixe-Zoque specialist Soren Wichmann first critiqued this theory on the basis that most of the Mixe-Zoquean loans seemed to originate only from the Zoquean branch of the family. This implied the loanword transmission occurred in the period after the two branches of the language family split, placing the time of the borrowings outside of the Olmec period. However, new evidence has pushed back the proposed date for the split of Mixean and Zoquean languages to a period within the Olmec era. Based on this dating, the architectural and archaeological patterns and the particulars of the vocabulary loaned to other Mesoamerican languages from Mixe-Zoquean, Wichmann now suggests that the Olmecs of San Lorenzo spoke proto-Mixe and the Olmecs of La Venta spoke proto-Zoque.  At least the fact that the Mixe-Zoquean languages are still spoken in an area corresponding roughly to the Olmec heartland, and are historically known to have been spoken there, leads most scholars to assume that the Olmec spoke one or more Mixe-Zoquean languages.

What else did they do as a society?
The spread of this vocabulary particular to their culture accompanied the diffusion of other Olmec cultural and artistic traits that appears in the archaeological record of other Mesoamerican societies.