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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Behav Ecol Sociobiol. 2013 Feb 21;67(9):10.1007/s00265-013-1491-z. doi: 10.1007/s00265-013-1491-z

Fig. 1.

Fig. 1

Exemplars of the facial expressions produced concomitantly with vocalizations. Rhesus monkey coo and scream calls taken at the midpoint of the expressions with their corresponding spectrograms