The proposed research will investigate non-human primate vocal communication and it's possible biological and evolutionary relationships to human language. Laboratory studies will be conducted on how baboons recognize differences their own highly vowel-like """"""""grunt"""""""" vocalizations, and the results contrasted with how humans perceive the same baboon vocalizations. The studies will focus on the perception of both natural and synthetic variants of the affiliative """"""""grunt"""""""" calls of baboons, and will complement prior work on both vocal analyses and field studies of these same baboon grunt calls. One set of experiments will determine how baboons use the acoustic features of vowel-like grunt calls to recognize a vocalizer's sex, and to test for the relative importance of specific acoustic cues that are likely to be important in these discriminations. Experiments will examine, in both baboons and humans, the generalization of male/female grunt calls to new tokens, use synthetic grunts to test the relative importance of fundamental frequency (F0) and formant patterning in these discriminations, and measure discrimination thresholds for recognition of vocalizer sex. A second set of experiments will determine how baboons use the acoustic features of vowel-like grunt calls to recognize other individuals, and also test for the relative importance of specific acoustic cues (F0, formant spacing) that are likely to be important in these discriminations. A third set of experiments will determine how baboons categorize vowel-like grunts based on their functional significance (i.e., """"""""move"""""""" versus """"""""infant"""""""" grunts) in the face of acoustic variation related to the sex and individual identity of the vocalizer. Experiments will characterize discrimination and labeling functions for natural and synthetic """"""""move"""""""" and """"""""infant"""""""" grunts in both baboons and humans (as a control group) to determine whether these grunt types are perceived in a linguistic-like fashion. The proposed research will extend our knowledge of the acoustic communication abilities of baboons and their relationships to the evolution of human communication.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Research Project (R01)
Project #
5R01MH065317-02
Application #
6801815
Study Section
Biobehavioral and Behavioral Processes 3 (BBBP)
Program Officer
Kurtzman, Howard S
Project Start
2003-09-15
Project End
2007-07-31
Budget Start
2004-08-01
Budget End
2005-07-31
Support Year
2
Fiscal Year
2004
Total Cost
$273,366
Indirect Cost
Name
Johns Hopkins University
Department
Psychiatry
Type
Schools of Medicine
DUNS #
001910777
City
Baltimore
State
MD
Country
United States
Zip Code
21218
Bliss-Moreau, Eliza; Barrett, Lisa Feldman; Owren, Michael J (2010) I Like the Sound of Your Voice: Affective Learning about Vocal Signals. J Exp Soc Psychol 46:557-563
Makagon, Maja M; Funayama, E Sumie; Owren, Michael J (2008) An acoustic analysis of laughter produced by congenitally deaf and normally hearing college students. J Acoust Soc Am 124:472-83
Owren, Michael J (2008) GSU Praat Tools: scripts for modifying and analyzing sounds using Praat acoustics software. Behav Res Methods 40:822-9
Owren, Michael J; Berkowitz, Michael; Bachorowski, Jo-Anne (2007) Listeners judge talker sex more efficiently from male than from female vowels. Percept Psychophys 69:930-41
Riede, Tobias; Arcadi, Adam Clark; Owren, Michael J (2007) Nonlinear acoustics in the pant hoots of common chimpanzees (Pan troglodytes): vocalizing at the edge. J Acoust Soc Am 121:1758-67
Patel, Erik R; Owren, Michael J (2007) Acoustics and behavioral contexts of ""gecker"" vocalizations in young rhesus macaques (Macaca mulatta). J Acoust Soc Am 121:575-85
Owren, Michael J; Cardillo, Gina C (2006) The relative roles of vowels and consonants in discriminating talker identity versus word meaning. J Acoust Soc Am 119:1727-39
Hienz, Robert D; Weerts, Elise M (2005) Cocaine's effects on the perception of socially significant vocalizations in baboons. Pharmacol Biochem Behav 81:440-50
Riede, Tobias; Mitchell, Brian R; Tokuda, Isao et al. (2005) Characterizing noise in nonhuman vocalizations: Acoustic analysis and human perception of barks by coyotes and dogs. J Acoust Soc Am 118:514-22
Hienz, Robert D; Jones, April M; Weerts, Elise M (2004) The discrimination of baboon grunt calls and human vowel sounds by baboons. J Acoust Soc Am 116:1692-7