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.

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.

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.


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.