Published online by Cambridge University Press: 17 May 2016
Previous studies at the Program for Biosocial Research at Northern Illinois University utilized an electronic instrument to conduct voice analysis for the purpose of determining the amount of psychophysiological stress experienced by a political speaker. These studies then tested the technique on the speeches of three presidents during international crises: John F. Kennedy during the 1961 Berlin crisis, Lyndon B. Johnson during the crisis in the Dominican Republic, and Richard M. Nixon during the United States incursion into Cambodia.