 In 2002, the anthropologists Corey S. Sparks and Richard L. Jantz claimed that differences between children born to the same parents in Europe and America were very small and insignificant and that there was no detectable effect of exposure to the American environment on the cranial index in children.They argued that their results contradicted Boas's original findings and demonstrated that they may no longer be used to support arguments of plasticity in cranial morphology.However, Jonathan Marks—a well-known physical anthropologist and former president of the General Anthropology section of the American Anthropological Association—has remarked that this revisionist study of Boas's work "has the ring of desperation to it (if not obfuscation), and has been quickly rebutted by more mainstream biological anthropology".