Part 1 Introduction: studies - a status report, Robert J. Sharer what defines Olmec?, David C. Grove. Part 2 The Heartland: Olmex archaeology - what we know and what we wish we know, Richard A. Diehl the heartland - evolution of material culture, Gareth W. Lowe the heartland - evolution of ideology, Michael D. Coe. Part 3 Olmec interaction - the external regions: Coapexo and Tlatilco - sites with materials in the basin of Mexico, Paul Tolstoy Chalcatzingo and its connection, David C. Grove Zapotec chiefdoms and the nature of formative religions, Joyce Marcus the Chiapas Olmec, Thomas A. Lee Jr diffusion - a sculptural view from Pacific Guatemala, John Graham the and the southeastern periphery of Mesoamerica, Robert J. Sharer.
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Stark et al. (1991) studied this question.