'During the 1930s, many articles appeared that claimed illustrators' – meaning conversational gestures – 'were inborn and that the "inferior races," such as the Jews or gypsies, made many large, sweeping illustrators compared to the "superior," less gesturally expansive Aryans. No mention was made of the grand illustrators shown by Germany's Italian ally! David Efron, an Argentinian Jew studying at Columbia University with the anthropologist Franz Boas, examined the illustrators of people living on the Lower East Side of New York City. He found that immigrants from Sicily used illustrators that draw a picture or show an action, while Jewish Lithuanian immigrants used illustrators that give emphasis or trace the flow of thought. Their offspring born in the United States who attended integrated schools did not differ from one another in the use of illustrators. Those of Sicilian parentage used illustrators similar to those used by children of Jewish Lithuanian parents. The style of illustrators is acquired, Efron showed, not inborn.'
from Telling Lies by Paul Ekman