Sunday, October 20, 2013

MPIG 2013: Thank You Iowa State University!

Another great MPIG conference, this year in Iowa State University. Though this is only my second MPIG conference, I feel like this is one of the greatest regional conference to participate in. Great science and good people all around. It's one of the reason why a Northeasterner like me is in the midwest every year. Thanks for Jill Pruetz and Stacy Lindshield for such great hosts.

Also, thanks to those who stopped me and said hi during the conference. I love meeting my blog readers. You have no idea how happy you make me when you tell me you read my blog!

MPIG 2013 Pre Registration

Keynote Speaker Dr. Paul Garber, Distinguished Primatologist, on Primate Feeding Ecology

MPIG Reception

Dr. Julienne Rutherford presenting the first talk of the conference, "Ten Years of MPIG". Congrats for being 10 years old, MPIG!

Yours truly and his poster.

Saturday, October 19, 2013

MPIG 2013 Poster

Here's my poster for MPIG 2013. The PDF is stored on Google Drive and you can download a PDF copy of it. Please note that there is a slight color distortion when viewing the poster on Google Drive.


Gestural communication is thought to be a precursor to the origin of human language. Since human language is lateralized between brain hemispheres, is there also a lateralization in gestural communication in nonhuman primates?

This preliminary study sought to elucidate whether the hamadryas baboon (Papio hamadryas) troop at the Prospect Park Zoo in Brooklyn, New York exhibits hand preference in gestural communication. Two types of gestural communication were examined: hand slapping and muzzle wiping. An all occurrence sampling method was completed in 3 weeks with a total of 24 hours of observation and data collection. The Handedness Index (HI) for each individual (N=7) was calculated for both hand slapping and muzzle wiping.

This study revealed that most P. hamadryas individuals at the Prospect Park Zoo exhibit a right hand preference for hand slapping, but exhibit no hand preference for muzzle wiping. These results are consistent with previous studies on another baboon species, olive baboons (Papio anubis) (Vauclair et al., 2005; Meguerditchian & Vauclair, 2006; Meguerditchian & Vauclair, 2009). Results from this preliminary study can contribute to the study of nonhuman primate handedness, as well as the evolution of language.

Friday, October 18, 2013

Nonhuman Primate Handedness: Is there is a population-level preference?

Do you write with your left hand or right hand? When ask to open a jar, do you use your left or right hand? A handful of "tasks" can be used to determine your hand preference. Just because someone uses their right hand to write doesn't automatically makes them a right-handed person; some cultures frown upon left hand use and taught left-handed children to write with their right hand.

Humans are usually righties (right-handed), preferring to use their right hands for most manual tasks. Most, I said, because there are instances where reaching over with the closest hand would suffice. About 70% to 90% of the world population is right-handed. Then you have the lefties (left-handed) who basically are going to hell because they are the devil's minion (no, not really LOL!). Sprinkled among them are the ambidextrous, those that use their left and right hand with no preference. But is this true in nonhuman primates? Ever wonder if other primates have hand preference like we do?

Handedness is due to the lateralization of the brain hemispheres (Knecht et al., 2000). Individuals that are right-handed have a more dominant left brain hemisphere, while those that are left-handed have a more dominant right brain hemisphere. In most humans (Homo sapiens), the left brain hemisphere is more dominant, thus the majority of the human population is right-handed (Knecht et al., 2000). The human left brain hemisphere is also involved in language and is where Broca’s area and Wernicke’s area are located (Knecht et al., 2000). Broca’s area is involved in speech production while Wernicke’s area is involved in language comprehension. Lateralization results in a preference for handedness in humans (Knecht et al., 2000). That is, an individual is left-handed or right-handed due to brain lateralization, while ambidextrous individuals are not lateralized at all.

A meta analysis by McGrew and Marchant (1997) on hand laterality in nonhuman primates concluded that nonhuman primates do not show patterns of hand preference. Instead, the authors claim that even though individuals might be lateralized and have a preference for either left or right hand, there is no evidence that hand preference exists in population-level. The only nonhuman primates that have a population bias in handedness are chimpanzees (Pan troglodytes) but are from captive populations (McGrew & Marchant, 1997). The authors claim that patterns of handedness in nonhuman primates cannot be used as a theoretical framework for the evolution of handedness and brain lateralization in humans because only few primates display handedness and most are from captive settings (McGrew & Marchant, 1997).

However, Hopkins (1999) argued that the criteria used by McGrew and Marchant (1997) to measure individual and population-level handedness were inaccurate, therefore oversimplifying the results. Instead, Hopkins (1999) offered new methodologies and a theoretical framework to interpret population-level nonhuman primate handedness. While McGrew and Marchant (1997) claimed that population-level hand preference is absent in nonhuman primates, Hopkins (1999) argued that McGrew and Marchant (1997) had left out a few significant studies in their meta analysis which showed population-level handedness. These studies have shown that population-level hand preference can be found in captive chimpanzees (Pan troglodytes), bonobos (Pan paniscus), and squirrel monkeys (Saimiri sciureus) (Aruguete et al., 1992; Colell et al., 1995; Hopkins, 1995 ; Hopkins and de Waal, 1995; Hopkins et al., 1993; Shafer, 1997). Similar studies on prosimians (Ward et al., 1990; Ward et al., 1993), New World Monkeys (Diamond & McGrew, 1994; Westergaard & Suomi, 1993) Old World Monkeys (Fagot et al., 1991; Vauclair et al., 2005; Meguerditchian & Vauclair, 2006; Meguerditchian & Vauclair, 2009), and great apes (Hopkins & Morris, 1993) have also shown patterns of population-level hand preference. 

A study by Vauclair et al (2005) found that olive baboons (Papio anubis) have a population-level preference for right handedness when performing bimanual tasks but no significant preference in handedness when performing unimanual tasks. Later, Meguerditchian & Vauclair (2006) found that olive baboons (P. anubis) have a preference for right handedness when communicating. Specifically, olive baboons use their right hands to hand slap when presented with agonistic stimuli by experimenters. Subsequent study on communicative gestures and non-communicative actions in olive baboons suggests that preference for right handedness may be due to the left brain hemisphere dominance, and that lateralization may have favored right handedness in communicative gestures as opposed to pure motor functions in unimanual tasks (Meguerditchian & Vauclair, 2009).

Picture of an adult Olive baboon performing the TUBE task. (Vauclair et al., 2005)

Although there were a few studies on hand preference in Old World monkeys, only rhesus macaques (Macaca mulatta) (Fagot et al., 1991) and olive baboons (Papio anubis) (Vauclair et al., 2005; Meguerditchian & Vauclair, 2006; Meguerditchian & Vauclair, 2009) were tested for hand preference. So far, no hand preference study has been published on hamadryas baboons (Papio hamadryas) to elucidate whether these baboons exhibit population-level handedness.

BLOGGER'S NOTE: I will be presenting a poster on hamadryas baboon hand preference in gestural communications at the Midwest Primate Interest Group (MPIG) 2013. Please read my next post for a PDF version of the poster.


Aruguete, M. S., Ely, E. A., and King, J. 1992. Laterality in spontaneous motor activity of chimpanzees and squirrel monkeys. Am. J. Primatol. 27: 177-188.

Colell, M., Segarra, M. D., and Pi, J. S. 1995. Manual laterality in chimpanzees (Pan troglodytes) in complex tasks. J. Comp. Psychol. 109: 298-307.

Diamond, A.C., & McGrew, W.C. 1994. True handedness in the cotton-top tamarins (Saguinus oedipus). Primates 35: 69-77.

Fagot, J., Drea, C.M., & Wallen, K. 1991. Asymmetrical hand use in rhesus monkeys (Macaca mulatta) in tactually and visually regulated tasks. Journal of Comparative Psychology 150: 260-268.

Hopkins, W.D. 1995. Hand Preferences for a Coordinated Bimanual Task in 110 Chimpanzees (Pan troglodytes): Cross-Sectional Analysis. Journal of Comparative Psychology 109(3): 291 - 297.

Hopkins, W.D. 1999. On the Other Hand: Statistical Issues in the Assessment and Interpretation of Hand Preference Data in Nonhuman Primates. International Journal of Primatology 20 (6).

Hopkins, W.D., & Morris, R.D. 1993. Handedness in great apes. A review of findings. International of Journal of Primatology 14: 1-25.

Hopkins, W. D., and de Waal, F. D. 1995. Behavioral laterality in captive bonobos (Pan paniscus): Replication and extension. Int. J. Primatol. 16: 261-276.

Knecht, S., Dräger, B., Deppe, M., Bobe, L., Lohmann, H., Flöel, A., et al. 2000. Handedness and hemispheric language dominance in healthy humans. Brain 123: 2512–2518.

McGrew W.C., & Marchant L.F. 1997. On the Other Hand: Current Issues in and Meta-Analysis of the Behavioral Laterality of Hand Function in Nonhuman Primates. Yearbook of Physical Anthropology 40:201–232.

Meguerditchian, A. & Vauclair, J. 2006. Baboons communicate with their right hand. Behavioural Brain Research 171 (2006) 170–174.

Meguerditchian, A. & Vauclair, J. 2009. Contrast of hand preferences between communicative gestures and non-communicative actions in baboons: Implications for the origins of hemispheric specialization for language. Brain & Language 108 (2009) 167–174.

Shafer, D. D. 1997. Hand preference behaviors shared by two groups of captive bonobos. Primates 38: 303-313.

Vauclair et al., 2005. Hand preferences for unimanual and coordinated bimanual tasks in baboons (Papio anubis). Brain Res Cogn Brain Res. 25(1): 210–216.

Ward, J.P., Milliken, G.W., & Stafford, D.K. 1993. Patterns of lateralized behavior in prosimians. In J.P. Ward & W.D. Hopkins (Eds.), Primate laterality: Current behavioral evidence of primate asymmetries (pp. 43-76). New York: Springer-Verlag.

Ward, J.P., Milliken, G.W., Dodson, D.L., Stafford, D.K., & Wallace, M. 1990. Handedness as a function of sex and age in a large population of Lemur. Journal of Comparative Psychology 104: 167-173.

Westergaard, G.C., & Suomi, S.J. 1993. Hand preference in capuchin monkeys varies with age. Primates 34: 295-300.

Thursday, September 19, 2013

Please fill out this survey for Lawrence Jacobsen Library to evaluate its digital resources

Please fill out the survey for Lawrence Jacobsen Library to evaluate its digital resources so it can receive appropriate funding. This is the site where I personally access to use Primate Lit, Primate News, Primate Jobs and Primate Fact Sheet. As you can tell, this site is very important and dear to me.

The staff of the Lawrence Jacobsen Library of the Wisconsin National Primate Research Center (WNPRC) has developed several websites and related services. We are evaluating the usefulness of these resources to various user communities and using this information to plan a grant application for their continuing support. Please help us by completing this survey and sharing the survey with interested colleagues. Your input is critically important to this process.

So, please fill out this short survey. I use this resource a lot, and I am sure a lot of people do so as well for their primate resources. I would love for the Lawrence Jacobsen Library to receive appropriate funding so it can be maintained.

Thank you!

Monday, August 26, 2013

MPIG 2013: Iowa State University

The 10th annual Midwest Primate Interest Group (MPIG) will be held in Iowa State University, Iowa on October 18th and 19th this year. The amazing Dr. Jill Pruetz will be the local host. I will be at the conference and I look forward to seeing familiar and new faces there.

Here are some info you might find useful if you are interested in attending or presenting at the conference. Thanks for Dr. Katherine MacKinnon for the write up!

1. Abstracts
Abstracts are due Sunday, September 1. Send your abstracts as a Word document to Dr. Julienne Rutherford: Indicate in your email your preference for poster or podium presentation. Abstracts are limited to 275 words. Please use 12 point Arial font (if possible) and format the title/author information as follows:

Developing the brain: A potential role for the placenta in hominin brain evolution

Authors: Julienne Rutherford 1,2,*, Elizabeth Abrams 2, Kate Clancy 3, Victoria DeMartelly 1, Sana Said 2

1 University of Illinois at Chicago, Comparative Primate Biology Laboratory
2 UIC, Department of Anthropology
3 University of Illinois at Urbana-Champaign, Department of Anthropology

* < full contact information for corresponding/presenting author >

2. Meeting Registration
Registration fees are $15 for students and $40 for faculty. Please make your check payable to the Midwest Primate Interest Group and mail to Dr. Robert Sussman, MPIG Treasurer, Department of Anthropology, Washington University, Campus Box 1114, One Brookings Drive, St. Louis, MO 63130.

(You may register onsite as well).

3. Hotels and Travel Info
MPIG has a group block of hotel rooms from October 17-19 at the Hotel Memorial Union on the Iowa State University campus.

--Single-queen $80 (after discount)

--Single-king $90 (after discount)

For reservations, call 1-800-433-3449 and mention the Midwest Primate Interest Group to get the group discount.

MU Hotel website:
More lodging options can be found at:
Des Moines International Airport:

4. 2013 Distinguished Primatologist Award
Dr. Paul Garber will be the recipient of this year's award and his Friday evening talk is titled "Time Vs. Energy: New Perspectives on Primate Feeding Ecology", to be followed by the opening reception. Make sure you get to Ames by late Friday afternoon and/or in time for the opening festivities! (see #5)

5. Schedule for the 2-day meeting
As in past years, the MPIG meeting schedule generally goes something like this (subject to slight revisions as we organize this year's program...)

Friday (10/18)
7pm – The Distinguished Primatologist Award, followed by reception from 8:00-9:30pm

Saturday (10/19)

8am – 10am Light breakfast provided

8:30am – 12:00pm Podium presentations

12:00 – 1:30pm Lunch break (on your own)

1:30 – 3:00pm Podium presentations

3:00 – 5:00pm Poster presentations

5:00pm -- Closing remarks, followed by party (time/place TBA)

Just a reminder: as we transition from our old website to a new one, please check the MPIG facebook page for all the latest information and updates.

The 9th MPIG conference at University of Northern Illinois with my homegirl Ashlee of This is Serious Monkey Business blog.