Abstract
Although several studies have examined the effect of human odor on kin recognition and mate choice, few have focused on the impact of familiarity on recognition of nonrelatives by olfactory cues. As part of a program designed to engage students in scientific research, 53 high school students researched, planned, and implemented a project to analyze the effect of odor on human recognition of, and preference for, friends, sex, and self. A total of 37 students, including friends of their choosing, wore T-shirts for three consecutive nights. During that time, subjects were controlled for exposure to extraneous perfumes, household odors, and other humans. The students were then asked to smell a series of five shirts and evaluate them with respect to pleasantness. Students were also asked to identify the shirts belonging to themselves and their friend, and determine the sex of the person who wore each shirt. Although subjects were unable to distinguish sex by olfactory cues alone, a significant percentage of subjects were able to identify their own odor (51.6%), as well as distinguish the odor cue of their friend (38.7%). Additionally, subjects who could not identify their friend's cue were apt to choose the odor of a member of the opposite sex as their friend. This result was not believed to rely on odor preference as neither individual, friend, nor stranger odors were rated significantly different with respect to odor pleasantness. The ability to recognize friends via odor cues lends credence to the hypothesis that association and familiarity are important aspects of conspecific olfactory recognition in humans. Furthermore, this study augments evidence that olfaction may supplement visual and auditory cues used in human conspecific and kin recognition.


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Acknowledgments
We thank Zoto's International, Inc., for their donation of soap, shampoo, and conditioner; Graphic Connections of Geneva for their assistance in obtaining T-shirts; Dr. Jan Nyrop and the Cornell University Office of Statistical Consulting for assistance with statistical calculations; Dr. Charles E. Linn, Jr., Dr. Wendell Roelofs, Dr. Robert Johnston, Prof. Elaine Wethington, and Sarah Demo for comments on the manuscript; and the Cornell Science Inquiry Partnerships, Geneva High School, the NYS Agricultural Experiment Station, and Dr. Wendell Roelofs' laboratory for their support and assistance. This research is supported by the National Science Foundation Graduate Teaching Fellows in K-12 Education Program and Cornell University through the Cornell Science Inquiry Partnerships Program.
This research was fully researched, planned, and implemented by the following students: Maria Acquilera, Steve Alaimo, Nadine Amsel, Jenn Anderson, Chris Armstrong, Holly Baker, Mallory Barnes, Katherine Beckley, Michael Bianco, Kelsey Blowers, Ariel Brown, Alexis Carter, Jenn Case, Christi Chacchia, Jason Chan, Amy Chen, Nan Choi, Mike Crisanti, Josh Emerson, Antoine Evans, Ron Eveland, Laura Fratangelo, Kyle Frank, Rob Freeman, Morgan Fryer, Lori Guarneri, David Hall, Henry Heaton, Will Hunt, Chris Iannapollo, Hope James, Erika Kerr, Cassie Legg, Lauren Luzzi, Shanna Marshall, Samonn McCoy, Annette Michaels, Mike Moses, Elyse Nepa, Kim Notebaert, Jeannine Ocasio, Alicia Pearson, Caitlin Pratt, Kyle Shane, Krystle Smallwood, Emily Smith, Meg Spruill, Heather Stewart, Catherine Watts, Jasmin Williams, Nick Wisnieski, Jason Wirth, and Tara Wyszkowski.
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This research was designed and implemented by 53 high school General Biology and Advanced Placement students who contributed as fellow authors to this project. Refer to Acknowledgments for a full list of names.
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Olsson, S.B., Barnard, J. & Turri, L. Olfaction and Identification of Unrelated Individuals: Examination of the Mysteries of Human Odor Recognition. J Chem Ecol 32, 1635–1645 (2006). https://doi.org/10.1007/s10886-006-9098-8
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DOI: https://doi.org/10.1007/s10886-006-9098-8

