Lethbridge publications 2007-

In Press
L. Barrett. What is human nature, if it is anything at all? In: The Routledge Handbook of Evolution and Philosophy. (ed, R. Joyce), Routledge.

L. Barrett & G. Stulp. Evolutionary Psychology. In: International Encyclopedia of Anthropology (Ed. C. Power). Wiley-Liss.

L. Barrett, J. Parker & S.P. Henzi. Primate reproductive synchrony. In: International Encyclopaedia of Primate Behavior (Ed. A. Fuentes), Wiley-Liss.

L. Barrett. The (r)evolution of primate cognition: does the social intelligence hypothesis lead us around in anthropocentric circles? In: The Routledge Handbook of the Social Mind (ed, Julian Kiverstein), Routledge.

L. Barrett. The evolution of cognition: a 4e perspective. In: The Oxford Handbook of  4e Cognition (eds, Albert Newen, Leon de Bruin, Shaun Gallagher), Oxford University Press.

T.R. Bonnell, P. M. Clarke, S.P. Henzi & L. Barrett. Individual-level movement bias leads to the formation of higher-order social structure in a mobile group of baboons. Royal Society Open Science 4: doi.org/10.1098/rsos.170148.

C. Young, R. McFarland, L. Barrett & S.P. Henzi. Formidable females and the power trajectories of socially integrated male vervet monkeys. Animal Behaviour 125: 61-67.

R. McFarland, D. Murphy, D. Lusseau, S.P. Henzi, J.L. Parker, T.V. Pollet & L. Barrett. The “strength of weak ties” among female baboons: fitness-related benefits of social bonds. Animal Behaviour  126: 101-106.

S.P. Henzi, R. Hetem, A. Fuller, S. Maloney, C. Young, D. Mitchell, L. Barrett & R. McFarland. Consequences of sex-specific sociability for thermoregulation in male vervet monkeys during winter. Journal of Zoology 302: 193–200.

G. Stulp, R. Sear & L. Barrett. The reproductive ecology of industrial societies, Part I: why measuring fertility matters. Human Nature 27: 422-444.

G. Stulp, R. Sear, S.B. Schaffnit, M.C. Mills & L. Barrett. The reproductive ecology of industrial societies, Part II: the association between wealth and fertility. Human Nature 27: 445-470.

T. Bonnell, S.P. Henzi & L. Barrett. Direction matching for sparse movement datasets: determining interaction rules in social groups. Behavioral Ecology: 28: 193-203.

M.J. Dostie, D. Lusseau, T. Bonnell, P.M.R. Clarke, G. Chaplin, S. Kienzle, L. Barrett & S.P. Henzi. Proof of principle: The adaptive geometry of social foragers. Animal Behaviour 119: 173-178. Link.

L. Barrett. Why brains are not computers, why behaviourism isn’t Satanism, and why dolphins are not aquatic apes. Behavior Analyst 39: 9-23.

L. Barrett & G. Stulp.  Revolution, reconciliation, integration: is there a way to bring social and biological anthropology together? Evolutionary Anthropology 25: 174-182.

N. Josephs, T. Bonnell, M. Dostie, L. Barrett & S.P. Henzi. Working the crowd: Sociable vervets benefit by reducing exposure to risk. Behavioral Ecology 27: 988-994. Link

G. Stulp & L. Barrett. Wealth, fertility and adaptive behaviour in industrial populations. Philosophical Transactions of the Royal Society, Series B 371: 20150153

L. Barrett & S.P. Henzi. Understanding antagonism: a comment on Sheehan & Bergman. Behavioral Ecology 27: 17-18.

G. Stulp & L. Barrett. Evolutionary perspectives on human height variation. Biological Reviews 91: 216-234. 

N. Freeman, C. Young, L. Barrett & S.P. Henzi. Coalition formation by male vervet monkeys (Chlorocebus pygerythrus) in South Africa. Ethology 122: 45-52.

R. McFarland, S.P. Henzi, L. Barrett, A. Wanigaratne, E. Coetzee, A. Fuller, R.S. Hetem, D. Mitchell & S. Maloney. Thermal consequences of increased pelt loft infer an additional utilitarian function for grooming. American Journal of Primatology  78: 456-461.

A.S. Barrett, L. Barrett, S.P. Henzi and L. Brown. Resource selection on woody plant species by vervet monkeys (Chlorocebus pygerythrus) in mixed-broad leaf savanna. African Journal of Wildlife Research 46: 14-21.


L. Barrett. A better kind of continuity. The Southern Journal of Philosophy 53 (s1): 28-49.

L. Barrett, G. Stulp & T. Pollet. Evolved biocultural beings (who invented computers). Frontiers in Psychology 6: 1047. http://dx.doi.org/10.3389/fpsyg.2015.01047

J. Havlíček, K. Cobey, L. Barrett, K. Klapilová & C. Roberts. The spandrels of Santa Barbara? A new perspective on the peri-ovulation paradigm. Behavioral Ecology 26: 1249-1260.

J. Havlíček, K. Cobey, L. Barrett, K. Klapilová & C. Roberts. Greater precision, not parsimony, is the key to testing the peri-ovulation spandrel hypothesis: a response to comments on Havlíček et al. 2015. Behavioral Ecology 26: 1265-1267.

G. Stulp & L. Barrett. Fertility theory: Theory of life history evolution. In: The International Encyclopedia of the Social and Behavioral Sciences, 2nd edition, Vol 9 (Ed. J. Wright), Oxford: Elsevier. pp. 40–45.

G. Stulp, T.V. Pollet & L. Barrett. The not-always-uniquely predictive power of an evolutionary approach to understanding our not-so computational nature. Frontiers in Psychology 6: Article 419.doi: 10.3389/fpsyg.2015.00419

G. Stulp, L. Barrett, F. Tropf & M. Mills. Does natural selection favour taller stature among the tallest people on earth? Proceedings of the Royal Society London B.

T. Pollet, G. Stulp, S.P. Henzi & L. Barrett. Taking the aggravation out of data aggregation: a conceptual guide to dealing with statistical issues related to the pooling of individual-level observational data. American Journal of Primatology 77: 727–740. DOI: 10.1002/ajp.22405

L. Barrett. Back to the rough ground and into the hurly-burly: why cognitive ethology needs Wittgenstein’s razor. In: Mind, Language and Action: Proceedings of the 36th International Wittgenstein Symposium (eds. D. Moyal-Sharrock, V. Munz & A. Coliva). De Gruyter, Berlin, pp. 299-316.

R. McFarland, A. Fuller, R. Hetem, D. Mitchell, S. Maloney, S.P. Henzi & L. Barrett. Social integration confers thermal benefits in a gregarious primate. Journal of Animal Ecology 84: 871–878.
Comment: National Geographic

A. Bissonnette , S. Perry, L. Barrett, J.C. Mitani, M. Flinn,S. Gavrilets & F.M. de Waal. Coalitions in theory and reality: a review of pertinent variables and processes. Behaviour 152: 1-56. DOI:10.1163/1568539X-00003241

L. Abell, P. Qualter, G. Brewer, A. Barlow, M. Stylianou, S.P. Henzi and L. Barrett. 2015. Why machiavellianism matters in childhood: The relationship between children's Machiavellian traits and their peer interactions in a natural setting. Europe's Journal of Psychology 11: 484–493.

K. Norman, S.M. Pellis, L. Barrett & S.P. Henzi. Down but not out: Supine postures as facilitators of play in domestic dogs. Behavioural Processes 110:  88-95. DOI:10.1016/j.beproc.2014.09.001
Comment: Scientific American, Psychology Today

L. Barrett, T. Pollet & G. Stulp. From computers to cultivation: Reconceptualising evolutionary psychology. Frontiers in Psychology 5: 1-14. doi: 10.3389/fpsyg.2014.00867

N. Ducheminsky, S.P. Henzi & L. Barrett. Responses of vervet monkeys in large troops to terrestrial and aerial predator alarm calls. Behavioral Ecology 25: 1474-1484. doi:10.1093/beheco/aru151

L. Barrett. What counts as (non) cognitive? A comment on Rowe and Healy. Behavioral Ecology 25: 1293-1295. doi:10.1093/beheco/aru114

A. Ibanez, S.A. Kotz, L. Barrett, J. Moll and M. Ruz. Situated affective and social neuroscience. Frontiers In Human Neuroscience 8: Article 57. DOI: 10.3389/fnhum.2014.00547

A. Lubbe, R.S. Hetem, R. McFarland, L. Barrett, S.P. Henzi, D. Mitchell, L.C.R. Meyer, S.K. Maloney & A. Fuller. Thermoregulatory plasticity in free-ranging vervet monkeys, Chlorocebus pygerythrus. Journal of Comparative Physiology B. 184: 799-809.

G. Stulp,  M. Mills, T.V. Pollet & L. Barrett. Non-linear associations between stature and mate choice characteristics for American men and their spouses. American Journal of Human Biology 26: 530-537.

S.M. Pellis, V.C. Pellis, L. Barrett & S.P. Henzi. One good turn deserves another: Combat versus other functions of acrobatics in the play fighting of vervet monkeys (Chlorocebus aethiops). Animal Behavior and Cognition 1: 128-143.

L. Barrett & B. Würsig. Why dolphins are not aquatic apes. Animal Behavior and Cognition 1: 1-18.

K.J. Rotenberg, P. Qualter, N. Holt, R.A. Harris, L. Barrett, L. & S.P. Henzi. When trust fails: The relation between children’s trust beliefs in peers and their peer interactions in a natural setting. Journal of Abnormal Child Psychology 42: 967-980.

S.P. Henzi & L. Barrett. Baboon mechanics. In: Primate Ethnographies (Ed. K.B. Strier), Pearson, New Jersey, pp. 107-117.

R. McFarland, L. Barrett, R. Boner, N. Freeman & S.P. Henzi.  Behavioral flexibility of vervet monkeys in response to climatic and social variability. American Journal of Physical Anthropology 154: 357–364.

L. Barrett & G. Stulp. Four more reasons why ethology matters: Tinbergen and the human sciences.
Human Ethology Bulletin
28: 39-49.

G. Stulp & L. Barrett. Binomial tests and randomization approaches: the case of US presidential candidate height and election outcomes. SAGE Research Methods Cases. SAGE Publications Ltd.DOI: http://dx.doi.org/10.4135/978144627305013509772

N. Andrienko, G. Andrienko, L. Barrett, M. Dostie & S.P. Henzi. Space transformation for understanding group movement. IEEE Transactions on Visualization and Computer Graphics 19: 2169-2178.

B.A. Patel, A.M. Horner, N.E. Thompson, L. Barrett & S.P. Henzi. Ontogenetic scaling of fore- and hind limb posture in wild chacma baboons (Papio hamadryas ursinus). PLoS ONE 8: e71020.

L. Barrett & S.P. Henzi. Social coordination: patience is a virtue for vervet monkeys. Current Biology 23: R311-R313.

R. McFarland, R. Hetem, A. Fuller, D. Mitchell, S.P. Henzi & L. Barrett. Assessing the reliability of biologger techniques to measure activity in a free-ranging primate. Animal Behaviour 85: 861-866.

L. Barrett & G. Stulp. The pleasures and pitfalls of studying humans from a behavioural ecological perspective. Behavioral Ecology 24: 1045-1046.

P.M. Kappeler, L. Barrett, D.T. Blumstein & T.H. Clutton-Brock (eds). Flexibility and Constraint in the Evolution of Mammalian Social Behaviour. Philosophical Transactions of the Royal Society London B.

P.M. Kappeler, L. Barrett, D.T. Blumstein & T.H. Clutton-Brock. Constraint and flexibility in mammalian social behaviour: introduction and synthesis. Philosophical Transactions of the Royal Society London B. 368: 1-10. doi.org/10.1098/rstb.2012.0337

L. Barrett, D.T. Blumstein, T.H. Clutton-Brock & P.M. Kappeler. Taking note of Tinbergen, or: The promise of a biology of behaviour. Philosophical Transactions of the Royal Society London B. 368: 1-5. doi.org/10.1098/rstb.2012.0352.

S.P. Henzi, N. Forshaw, R. Boner, L. Barrett & D. Lusseau. Scalar social dynamics in female vervet monkey cohorts. Philosophical Transactions of the Royal Society London B. 368: 1-9. doi.org/10.1098/rstb.2012.0351.

G.M. Pasternak, L.R. Brown, S.W. Kienzle, A. Fuller, L. Barrett & S.P. Henzi. Population ecology of vervet monkeys in a high latitude, semi-arid riparian woodland. Koedoe 55: 1-9. doi.org/10.4102/koedoe.v55i1.1078.

P. Qualter, K. Rotenberg, L. Barrett, S.P. Henzi, A. Barlow, M. Stylianou & R. Harris. Investigating hypervigilance for social threat of lonely children. Journal of Abnormal Child Psychology 41: 325-338.

L. Barrett. Minds and morals. Essay Review. Biosciences 62: 307-310.

E. Galway, L. Barrett & J. Newberry. How to make good subjects: guiding girls, creating citizens, constructing consumers. Jeunesse 12: 107-118.

L. Barrett, S.P. Henzi & D. Lusseau. Taking sociality seriously: The structure of multi-dimensional social networks as a source of information for individuals. Philosophical Transactions of the Royal Society London B. 367: 2108-2118.

N.J. Freeman, G.M. Pasternak, T.L. Rubi, L. Barrett & S.P. Henzi. Evidence for scent marking in vervet monkeys? Primates 53: 311-315.

P.M.R. Clarke, S.P. Henzi & L. Barrett. Estrus synchrony in a non-seasonal breeder: adaptive strategy or population process? Behavioral Ecology 23: 573-581.

L. Barrett. Why Behaviourism Isn't Satanism. In: Oxford Handbook of Comparative Evolutionary Psychology (Eds. J. Vonk & T. Shakelford), Oxford University Press, New York.

S.P. Henzi, L. Brown, L. Barrett & H. Marais. Troop size, habitat use and diet of chacma baboons (Papio hamadryas ursinus) in commercial pine plantations: implications for management. International Journal of Primatology 32: 1020-1032.

D. Lusseau, L. Barrett & S.P. Henzi. Formalising the multidimensional nature of social networks. arXiv:1101.3735v1

L. Barrett. Beyond the Brain: How Body and Environment Shape Animal and Human Minds. Princeton University Press, NJ.

L. Barrett. Embodied and distributed cognition. In: Encyclopedia of Animal Behaviour Vol. 1 (Eds. M. Breed & J. Moore), pp. 543-547, Elsevier, Amsterdam.

L. Barrett. Too much monkey business. In: Grounding Sociality: Neurons, Minds and Culture (Eds. G. Semin & G. Echterhoff), Psychology Press, London.

P.M.R. Clarke, J. Halliday, L. Barrett & S.P. Henzi. Chacma baboon mating markets: Competitor suppression mediates potential for intersexual exchange. Behavioral Ecology 21: 1211-1220.

A. Barrett, L. Brown, L. Barrett & S.P. Henzi. A floristic description and utilisation of two home ranges by vervet monkeys in Loskop Dam Nature Reserve, South Africa. Koedoe 52: 1-12.

P. McDougall, N. Forshaw, L. Barrett & S.P. Henzi. Leaving home: responses to water depletion by vervet monkeys. Journal of Arid Environments 74: 924-927.

S. P. Henzi, P.M.R. Clarke, C.P. van Schaik, G. Pradhan & L. Barrett. Infanticide and reproductive restraint in a polygynous social mammal. Proceedings of the National Academy of Sciences (USA) 107: 2130-2135.

L. Barrett & D. Rendall. Out of our minds: The neuroethology of primate strategic behavor. In: Primate Neuroethology (Eds. A. Ghazanfar & M. Platt), Oxford University Press, New York.

L. Barrett. 2009. A guide to practical babooning: Historical, social and cognitive contingency. Evolutionary Anthropology 18: 91-102.

P.M.R. Clarke, S.P. Henzi & L. Barrett. Sexual conflict in chacma baboons (Papio hamadyras ursinus): absent males select for proactive females. Animal Behaviour 77: 1217-1225.

P.M.R. Clarke, L. Barrett & S.P. Henzi. What role do olfactory cues play in chacma baboon mating? American Journal of Primatology 71: 1-10.

S.P. Henzi & L. Barrett. Comment on Strier. Current Anthropology 50: 221-222.

V. Coetzee, J.M. Greeff, L. Barrett & S. P. Henzi. Facial based ethnic recognition: Insights from two closely related but ethnically distinct groups. South African Journal of Science 105: 464-466.

S.P. Henzi, D. Lusseau, T. Weingrill, C.P. van Schaik & L. Barrett. Cyclicity in the structure of female baboon social networks. Behavioural Ecology and Sociobiology 63: 1015-1021.

F. Aureli, C. Schaffner, C. Boesch, S.K. Bearder, J. Call, C.A. Chapman, R. Connor, A. DiFiore, R.I.M. Dunbar, S.P. Henzi, K. Holekamp, A.H. Korstjens, R. Layton, P. Lee, J. Lehmann, J.H. Manson, G. Ramos-Fernandez, K.B. Strier & C.P. van Schaik. Fission-Fusion Dynamics: New Research Frameworks. Current Anthropology 49: 627-654.

L. Barrett & S.P. Henzi. Baboons. Current Biology 18: R404-R406.

P. Clarke, S.P. Henzi, L. Barrett & D. Rendall. On the road again: competitive effects and condition-dependent dispersal by male chacma baboons. Animal Behaviour 76: 55-63.

S.P. Henzi & L. Barrett. Coexistence in female-bonded primate groups. Advances in the Study of Behaviour 37: 43-81.

S.P. Henzi, L.F. de Sousa Pereira, D. Hawker-Bond, J. Stiller, R.I.M. Dunbar & L. Barrett. Look who’s talking: developmental trends in the size of conversational cliques. Evolution and Human Behavior 28: 66-74.

L. Barrett, S.P. Henzi & D. Rendall. Social brains, simple minds: does social complexity really require cognitive complexity? Philosophical Transactions of the Royal Society B. 362: 561-575.

V. Coetzee, L. Barrett, J.M. Greeff, S.P. Henzi, D.I. Perrett & A. Wadee. Common HLA alleles associated with health, but not with facial attractiveness. PLoS ONE 2: e640.

R.I.M. Dunbar & L. Barrett (eds). The Oxford Handbook of Evolutionary Psychology. Oxford University Press.

Other indicative current lab. member publications

T.R. Bonnell, R. Sengupta, C.A. Chapman & T.L. Goldberg. 2010. An agent-based model of red colobus resources and disease dynamics implicates key resource sites as hot spots of disease transmission. Ecological Modelling 221: 2491–2500.

C.A. Chapman, V.A.M. Schoof, T.R. Bonnell, J.F. Gogarten & S. Calme 2015. Competing pressures on populations: long-term dynamics of food availability, food quality, disease, stress and animal abundance. Philosophical Transactions of the Royal Society London B 370: 20140112.

D.L. Forrester, D.P. VanderLaan, J.L. Parker & P.L. Vasey. 2011. Male sexual orientation and avuncularity in Canada: Implications for the kin selection hypothesis. Journal of Cognition and Culture 11: 339-352.

F. Koch, J. Signer, P. Kappeler & C. Fichtel. 2016.  The role of the residence-effect on the outcome of intergroup encounters in Verreaux's sifakas. Scientific Reports. DOI: 10.1038/srep28457.

C. Young, B. Majolo, M. Heistermann, O. Schülke & J. Ostner. 2014. Responses to social and environmental stress are attenuated by strong male bonds in wild macaques. Proceedings of the National Academy of Sciences (USA) 111: 18195-18200.