Publications
Edited Books and Special Issues
Hopper, L.M. (2022). Primatology in Zoos. American Journal of Primatology, 84(10). VIEW HERE
Ross, S.R., & Hopper, L.M. (2022). Chimpanzee Memoirs: Stories of Studying and Saving Our Closest Living Relatives. Columbia University Press: New York, USA. MORE INFO.
Hopper LM & Ross SR (2020). Chimpanzees in Context: A Comparative Perspective on Chimpanzee Behavior, Cognition, Conservation, and Welfare. University of Chicago Press: Chicago, USA. MORE INFO
Hopper, L.M., van de Waal, E., & Caldwell, C.A. (2018). Machiavellian Intelligence. Journal of Comparative Psychology, 132(4).
In Press
Hopper, L.M. (in press). Precariously prosocial: examining if, when, and why primates choose to help others. In U. Segerstrale (Ed.), The Evolution of Cooperation and the Role of Hamilton’s Rule. Oxford University Press.
2024
Hopper, L.M., Allen, J.V., Huynh, V., Painter, M.C., Izzi, J., & Hutchinson, E.K. (2024). The use of guanfacine to mediate anxiety-related reactivity and reduce associated agonistic behavior in two pigtail macaques (Macaca nemestrina). Comparative Medicine. DOWNLOAD
Westra, E., Fitzpatrick, S., Brosnan, S.F., Gruber, T., Hobaiter, C., Hopper, L.M., Kelly, D., Krupenye, C., Luncz, L.V., Theriault, J., & Andrews, K. (2024). In search of animal normativity: a framework for studying social norms in non-human animals. Biological Reviews, 99(3), 1058-1074. DOWNLOAD
2023
Jimenez, I.A., Craney, M.C., Painter, M.C., Burch-Strong, K.E., Plunkard, J.C.M., Villano, J.S., & Hopper, L.M. (2023). Behavioral evaluation of laboratory-housed ferrets (Mustela putorius furo) in different enclosure sizes. Journal of the American Association for Laboratory Animal Science, 62(5), 382-394. DOWNLOAD
Haertel, A.J., Beisner, B.A., Buehler, M.S., Capuano, S., Carrol, K.E., Church, T., Cohen, J.K., Crane, M.M., Dutton, J.W., Falkenstein, K.P., Gill, L., Hopper, L.M., Hotchkiss, C.E., Lee, G.H., Malinowski, C.M., Mendoza, E., Sayers, K., Scorpio, D.G., Stockinger, D., & Taylor, J.M. (2023). The impact of housing on birth outcomes in breeding macaque groups across multiple research centers. American Journal of Primatology, 85(11), e23554. DOWNLOAD
Hopper, L.M., Allen, J.V., Painter, M.C., Koenig, K.L., Maxwell, A.R., Izzi, J.M., & Hutchinson, E.K. (2023). Strategies for the in-place retirement of surplus and former research nonhuman primates. Laboratory Animal Science Professional, 11(3), 48-50.
Krall, C., Hopper, L.M., & Hutchinson, E.K. (2023). Mice just want to have fun: playpens facilitate faster training in non-invasive techniques for improved refinement and well-being. Laboratory Animal Science Professional, 11(3), 22-24. DOWNLOAD
2022
Guerrero-Martin, S.M., Brill, S., Carlson, B.W., Graham, M.L., Hopper, L.M., & Metcalf Pate, K. (2022). Development and implementation of a positive reinforcement training program for nonhuman primates in biomedical research. Laboratory Animal Science Professional, 10(1), 48-51.
Ross, S.R., Leinwand, J.G., & Hopper, L.M. (2022). Ethical considerations in conducting primate cognition research. In M.J. Beran & B.L. Schwartz (Eds.), Primate Cognitive Studies. (pp. 551-583). Cambridge University Press. VIEW HERE
ManyPrimates, Aguenounoun, G., Allritz, M., Altschul, D.M., Ballesta, S. Beaud, A., Bohn, M., Bornbusch, S.L., Brandão, A., Brooks, J., Bugnyar, T., Bustamante, L., Call, J., Canteloup, C., Caspar, K.R., de Sousa, A.A., DeTroy, S. E., Eppley, T.M., Fichtel, C., Fischer, J., Gong, C., Grange, J. A., Grebe, N.M., Hanus, D., Haus, D., Haux, L.M., Héjja-Brichard, Y., Helman, A., Hernadi, I., Hernandez-Aguilar, R.A., Hermann, E., Hopper, L.M., Howard, L.H., Huang, L., Huskisson, S.M., Jacobs, I., Jin, Z., Joly, M., Kani, F., Keupp, S., Kiefer, E., Knakker, B., Kóczán, K., Kraus, L., Kwok, S.C., Lefrançois, M., Lewis, L., Liu, S., Llorente, M., Lonsdorf, E., Loyant, L., Majecka, K., Maurits, L., Meunier, H., Mobili, F., Morino, L., Motes-Rodrigo, A., Nijman, V., Ihomi, C. N., Persson, T., Pietraszewski, D., Parrish, J.F.R., Roig, A., Sánchez-Amaro, A., Sato, Y., Sauciuc, G-A., Schrock, A.E., Schweinfurth, M.K., Seed, A., Shearer, C. L., Šlipogor, V., Su, Y., Sutherland, K., Tan, J., Taylor, D., Troisi, C.A., Völter, C.J., Warren, E., Watzek, J., Zablocki-Thomas, P. (2022). The evolution of primate short-term memory. Animal Behavior and Cognition, 9(4), 428-516. DOWNLOAD
Hopper, L.M. (2022). Primatology in zoos: studying behavior, cognition, and welfare. American Journal of Primatology, e23385. DOWNLOAD
Lutz, C.K., Coleman, K., Hopper, L.M., Novak, M.A., Perlman, J.E., & Pomerantz, O. (2022). Nonhuman primate abnormal behavior: etiology, assessment, and treatment. American Journal of Primatology, 84(6), e23380. DOWNLOAD
Hopper, L.M., Lake, B.R., Leinwand, J.G., Fultz, A., & Ross, S.R. (2022). Assessing chimpanzees' fluency of movement: applications for monitoring health and welfare. Applied Animal Behaviour Science, 250, 105612. VIEW HERE
Leinwand, J.G., Fidino, M., Ross, S.R., & Hopper, L.M. (2022). Familiarity mediates apes' attentional biases towards human faces. Proceedings of the Royal Society B: Biological Sciences, 289, 20212599. VIEW HERE
Kano, F., Furuichi, T., Hashimoto, C., Krupenye, C., Leinwand, J.G., Hopper, L.M., Martin, C.F., Otsuka, R., & Tajima, T. (2022). What is unique about the human eye? Comparative image analysis on the external eye morphology of human and nonhuman great apes. Evolution and Human Behavior, 43(3), 169-180. VIEW HERE
Fowler, K. J., Hopper, L. M., Ross, S. R., Leahy, M., & Santymire, R. M. (2022). Monitoring the behaviour and stress physiology of male gorillas Gorilla gorilla gorilla for one year following bachelor group formation. Journal of Zoo and Aquarium Research, 10(1), 40–46. VIEW HERE
Hopper, L. M. (2022). Editor-in-Chief introduction and welcome. Animal Behavior and Cognition, 9(1), 1-2. VIEW HERE
2021
Ross, SR, Lake BR, Fultz, A & Hopper LM (2021). An evaluation of thermal imaging as a welfare monitoring tool for captive chimpanzees. Primates, 62(6), 919-927. DOWNLOAD
Doelling, C.R., Cronin, K.A., Ross, S.R., & Hopper, L.M. (2021). The relationship between personality, season, and wounding receipt in zoo-housed Japanese macaques (Macaca fuscata): a multi-institutional study. American Journal of Primatology, 83(12), e23332.
Nelson, R.S., Connelly, E.C., & Hopper, L.M. (2021). Social learning in chimpanzees. In A.B. Kaufman, J. Call, & J.C. Kaufman (Eds.) The Cambridge Handbook of Animal Cognition. pp. 534-558. Cambridge University Press: Cambridge, UK.
Huskisson, S.M., Doelling, C.R., Ross, S.R., & Hopper, L.M. (2021). Assessing the potential impact of zoo visitors on the welfare and cognitive performance of Japanese macaques. Applied Animal Behaviour Science, 243, 10543. DOWNLOAD
Hopper LM, Gulli RA, Howard LH, Kano F, Krupenye C, Ryan AM & Paukner A (2021). The application of non-invasive, restraint-free eye-tracking methods for use with nonhuman primates. Behavior Research Methods, 53, 1003-1030. VIEW HERE
Huskisson SM, Ross SR & Hopper LM (2021). Do zoo visitors induce attentional bias effects for primates completing cognitive tasks? Animal Cognition, 24(3), 645-653. DOWNLOAD
Hopper LM (2021). Leveraging social learning to enhance captive animal care and welfare. Journal of Zoological and Botanical Gardens, 2(1), 21-40. VIEW HERE
Hopper LM, Allritz M, Egelkamp CL, Huskisson SM, Jacobson SL, Leinwand JG & Ross SR (2021). A comparative perspective on three primate species' responses to a pictorial emotional Stroop task. Animals, 11(3), 588. VIEW HERE
Huskisson SM, Egelkamp CL, Jacobson SL, Ross SR & Hopper LM (2021). Primates' food preferences predict their food choices even under uncertain conditions. Animal Behavior and Cognition, 8(1), 69-96 VIEW HERE
Leinwand JG, Moyse JA, Hopper LM, Leahy M & Ross SR (2021). The use of biofloors in great ape zoo exhibits. Journal of Zoo and Aquarium Research, 9(1), 41-48. VIEW HERE
2020
Cronin KA & Hopper LM (2020). Do monkeys care what's fair? Frontiers for Young Minds, 8, 00164 VIEW HERE
Tennie C, Bandini E, van Schaik CP & Hopper LM (2020). The Zone of Latent Solutions and its relevance to understanding ape cultures. Biology & Philosophy, 35, 55. VIEW HERE
Hopper LM, Jacobson SL & Howard LH (2020). Problem solving flexibility across early development. Journal of Experimental Child Psychology, 104966. VIEW HERE
Bernstein-Kurtycz LM, Hopper LM, Ross SR & Tennie C (2020). Zoo-housed chimpanzees can spontaneously use tool sets but perseverate on previously successful tool-use methods. Animal Behavior and Cognition, 7(3), 288-309. VIEW HERE
Hansen BK, Hopper LM, Ross SR & Fultz AL (2020). Understanding the effects of public programs on sanctuary-housed chimpanzees. Anthrozoös, 33(4), 481-495 DOWNLOAD
Leinwand JG, Huskisson SM, Egelkamp CL & Hopper LM (2020). Within- and between-species variation in the response of three primate species to a touchscreen gambling task. Learning and Motivation, 71, 101635. VIEW HERE
Earl SC, Hopper LM & Ross SR (2020). Same space, different species: the influence of exhibit design on the expression of zoo-housed apes' species-typical retiring behaviors. Animals, 10(5), 836 VIEW HERE
Fiore AM, Cronin KA, Ross SR & Hopper LM (2020). Food cleaning by Japanese macaques: innate, innovative, or cultural? Folia Primatologica, 91(4), 433-444. DOWNLOAD
Huskisson SM, Jacobson SL, Egelkamp CL, Ross SR & Hopper LM (2020). Using a touchscreen paradigm to evaluate food preferences and response to novel photographic stimuli of food in three primate species (Gorilla gorilla gorilla, Pan troglodytes, and Macaca fuscata). International Journal of Primatology, 41(1), 5-23 VIEW HERE
Hopper, L.M. & Carter, A.J. (2020). Methods to study chimpanzee social learning from a comparative perspective. In L.M. Hopper & S.R. Ross (Eds.), Chimpanzees in Context: A Comparative Perspective on Chimpanzee Behavior, Cognition, Conservation, and Welfare. pp. 167-188.
University of Chicago Press: Chicago, USA.
Tennie, C., Hopper, L.M., & van Schaik, C. (2020). On the origin of cumulative culture: consideration of the role of copying in culture-dependent traits and a reappraisal of the zone of latent solutions hypothesis. In L.M. Hopper & S.R. Ross (Eds.), Chimpanzees in Context: A Comparative Perspective on Chimpanzee Behavior, Cognition, Conservation, and Welfare. pp. 428-453. University of Chicago Press: Chicago, USA.
Hopper, L.M. & Ross, S.R. (2020). Understanding chimpanzees in context. In L.M. Hopper & S.R. Ross (Eds.), Chimpanzees in Context: A Comparative Perspective on Chimpanzee Behavior, Cognition, Conservation, and Welfare. pp. xiii-xvi. University of Chicago Press: Chicago, USA.
2019
Hopper LM & Torrance AW (2019). User innovation: a novel framework for studying animal innovation within a comparative context. Animal Cognition, 22(6), 1185-1190. DOWNLOAD
Hopper LM, Fernandez-Duque E & Williams LE (2019). Testing the weekend effect hypothesis: time of day and lunar phase better predict the timing of births in laboratory-housed primates than day of week. American Journal of Primatology, 81(7), e23026. DOWNLOAD
Hopper LM, Egelkamp CE, Fidino M & Ross SR (2019). An assessment of touchscreens for testing primate food preferences and valuations. Behavior Research Methods, 51(2), 639-650. DOWNLOAD
Frankel JS, Mallot EK, Hopper LM, Ross SR & Amato KR (2019). The effect of captivity on the primate gut microbiome varies with host dietary niche. American Journal of Primatology, 81(12), e23061. DOWNLOAD
ManyPrimates, Altschul DM, Beran MJ, Bohn M, Call J, DeTroy S, Duguid SJ, Egelkamp CE, Fichtel C, Fischer J, Flessart M, Hanus D, Haun DBM, Haux LM, Hernandez-Aguilar R, Herrmann E, Hopper LM, Joly M, Kano F, Keupp S, Melis AP, Rodrigo AM, Ross SR, Sánchez-Amaro A, Sato Y, Schmitt V, Schweinfurth MK, Seed AM, Taylor D, Völter CJ, Warren E & Watzek J (2019). Establishing an infrastructure for collaboration in primate cognition research. PLoS ONE, 14(10), e0223675. VIEW HERE
Egelkamp CL, Jacobson SL, Cronin KA, Wagner KE, Ross SR & Hopper LM (2019). A comparison of sequential learning errors made by apes and monkeys reveals individual but not species differences in learning. International Journal of Comparative Psychology, 32. VIEW HERE
Ross SR, Hansen BK, Hopper LM & Fultz A. (2019). A unique zoo-sanctuary collaboration for chimpanzees. American Journal of Primatology, 81(5), e22941. DOWNLOAD
Saiyed ST, Hopper LM & Cronin KA. Evaluating the behavior and temperament of African penguins in a non-contact animal encounter program. Animals, 9(6), 326. VIEW HERE
Bonnie KE, Bernstein-Kurtycz LM, Shender MA, Ross SR & Hopper LM (2019). Foraging in a social setting: a comparative analysis of captive gorillas and chimpanzees. Primates, 60(2), 125-131. DOWNLOAD
Jacobson SL & Hopper LM (2019). Hardly habitual: chimpanzees and gorillas show flexibility in their motor responses when presented with a causally-clear task. PeerJ, 7, e6195. VIEW HERE
2018
Hopper LM, Cronin KA & Ross SR (2018). A multi-institutional assessment of a short-form personality questionnaire for use with macaques. Zoo Biology, 37(5), 281-289. DOWNLOAD
Hopper LM, van de Waal E & Caldwell CA (2018). Celebrating the continued importance of "Machiavellian Intelligence" 30 years on. Journal of Comparative Psychology, 132(4), 427-431. DOWNLOAD
Hopper LM & Cronin KA (2018). What did you get? What social learning, collaboration, prosocial behavior and inequity aversion tell us about primate social cognition. In LD Di Paolo, F Di Vincenzo & AF d'Almeida (Eds.) Evolution of Primate Social Cognition. Springer.
Hopper LM (2018). Emulation. In J. Vonk & T. Shackelford (Eds.), Encyclopedia of Animal Cognition and Behavior. Springer International Publishing. 10.1007/978-3-319-47829-6. DOWNLOAD
Cronin KA, Bethell EJ, Jacobson SJ, Egelkamp C, Hopper LM & Ross SR (2018) Evaluating mood changes in response to anthropogenic noise with a response-slowing task in three species of zoo-housed primatesAnimal Behavior and Cognition, 5(2), 209-221. DOWNLOAD
Watson SK, Vale GL, Hopper LM, Dean LG, Kendal RL, Price EE, Wood LA, Davis SJ, Schapiro SJ, Lambeth SP & Whiten A (2018) Chimpanzees demonstrate individual differences in social information use. Animal Cognition 21, 639-650. VIEW HERE
Hansen BK, Fultz AL, Hopper LM & Ross SR (2018) An evaluation of video cameras for collecting observational data on sanctuary-housed chimpanzees (Pan troglodytes). Zoo Biology DOI: 10.1002/zoo.21410. DOWNLOAD
Egelkamp CL & Hopper LM (2018). Behavioral and cognitive research. In The International Encyclopedia of Biological Anthropology. W. Trevathan (Ed.). John Wiley and Sons, Inc.
2017
Hopper LM (2017). Social learning and decision making. In SJ Schapiro (Ed.). Handbook of Primate Behavior Management (pp. 225-242). CRC Press, Taylor and Francis Group.
Hopper LM (2017). Cognitive research in zoos. Current Opinion in Behavioral Sciences 16,100-110. DOWNLOAD
Hopper LM (2017). Behavioral and cognitive research. In The International Encyclopedia of Primatology. (pp. 85-90). A Fuentes (Ed.) Chichester, UK: Wiley-Blackwell, John Wiley & Sons, Inc. DOWNLOAD
Hopper LM (2017). Ghost Control. In J. Vonk & T. Shackelford (Eds.), Encyclopedia of Animal Cognition and Behavior. Springer International Publishing. DOI:10.1007/978-3-319-47829-6. DOWNLOAD
Hopper LM (2017). Andrew Whiten. In J. Vonk & T. Shackelford (Eds.), Encyclopedia of Animal Cognition and Behavior. Springer International Publishing. DOI: 10.1007/978-3-319-47829-6. DOWNLOAD
Vale GL, Flynn EG, Kendal J, Rawlings B, Hopper LM, Schapiro SJ, Lambeth SP & Kendal RL (2017). Testing differential use of payoff-biased social learning strategies in children and chimpanzees. Proceedings of the Royal Society: B, 284, 20171751. DOWNLOAD
Cronin KA, Jacobson SL, Bonnie KE & Hopper LM (2017). Studying primate cognition in a social setting to improve validity and welfare: a literature review highlighting successful approaches. PeerJ 5, e3649. VIEW HERE
Jacobson SL, Hopper LM, Shender MA, Ross SR, Leahy M & McNernie J (2017). Zoo visitors' perceptions of chimpanzee welfare are not affected by the provision of artificial environmental enrichment in a naturalistic exhibit. Journal of Zoo and Aquarium Research 5(1), 56-61. VIEW HERE
Howard LH, Wagner KE, Woodward AL, Ross SR & Hopper LM. (2017). Social models enhance apes' memory for novel events. Scientific Reports 7, 40926. VIEW HERE
2016
Hopper LM, Shender MA & Ross SR (2016). Behavioral research as physical enrichment for captive chimpanzees. Zoo Biology 35(4), 293-297. DOWNLOAD
Hopper LM, Freeman HD & Ross SR (2016). Reconsidering coprophagy as an indicator of negative welfare for captive chimpanzees. Applied Animal Behaviour Science 176, 112-119. DOWNLOAD
Hopper LM (2016). The individual and social drivers of primate innovation. PeerJ Preprints, 4, e2276v1. DOWNLOAD
Cronin KA & Hopper LM (2016). A comparative perspective on helping and fairness. In Social Cognition. (pp.26-45). Frontiers in Developmental Science Series. J Sommerville & J Decety (Eds.) Routledge, Taylor and Francis Group: New York, NY.
Beran MJ, Hopper LM, de Waal FBM, Brosnan SF & Sayers K (2016). Chimpanzees, cooking, and a more comparative psychology. Learning & Behavior 44, 118-121. DOWNLOAD
Beran MJ, Hopper LM, de Waal FBM, Sayers K & Brosnan SF (2016). Chimpanzee food preferences, associative learning, and the origins of cooking. Learning & Behavior 44, 103-108. DOWNLOAD
Ross SR & Hopper LM (2016). Seeking a deeper understanding of welfare-related behaviors. Connect. May 8-9. DOWNLOAD
Wagner KE, Hopper LM & Ross SR (2016). Asymmetries in the production of self-directed behavior by chimpanzees and gorillas during a computerized cognitive test. Animal Cognition 19(2), 343-350. DOWNLOAD
2015
Hopper LM, Kurtycz LM, Ross SR & Bonnie KE (2015). Captive chimpanzee foraging in a social setting: a test of problem solving, flexibility, and spatial discounting. PeerJ 3, e833. VIEW HERE
Hopper LM, Lambeth SP, Schapiro SJ & Whiten A. (2015). The importance of witnessed agency in chimpanzee social learning of tool use. Behavioural Processes 112, 120-129. DOWNLOAD
Hopper LM, Tennie C, Ross SR & Lonsdorf EV. (2015). Chimpanzees create and modify probe-tools functionally: A study with zoo-housed chimpanzees. American Journal of Primatology 77(2), 162-170. DOWNLOAD
Brosnan SF, Hopper LM, Richey S, Freeman HD, Talbot CF, Gosling S, Lambeth SP & Schapiro SJ. (2015). Personality influences responses to inequity and contrast in chimpanzees. Animal Behaviour 101,75-87. DOWNLOAD
Claidière N, Whiten A, Mareno MC, Messer E, Brosnan SF, Hopper LM, Lambeth SP, Schapiro SJ & McGuigan N. (2015). Selective and contagious prosocial resource donation in capuchin monkeys, chimpanzees and humans. Scientific Reports 5, 7631. DOWNLOAD
Kendal RL, Hopper LM, Whiten A, Brosnan SF, Lambeth SP, Schapiro SJ & Hoppitt W. (2015). Chimpanzees copy dominant and knowledgeable individuals: implications for cultural diversity. Evolution & Human Behavior.36, 65-72. DOWNLOAD
2014
Hopper LM, Lambeth SP, Schapiro SJ & Brosnan SF. (2014). Social comparison mediates chimpanzees' responses to loss, not frustration. Animal Cognition. 17(6), 1303-1311. DOWNLOAD
Hopper LM, Morgan DB & Ross SR. (2014). The next direction for primatology? A commentary on Setchell (2013). International Journal of Primatology 35(2), 341-348. DOWNLOAD
Hopper LM, Price SA, Freeman HD, Lambeth SP, Schapiro SJ & Kendal RL. (2014). Influence of personality, age, sex, and estrous state on chimpanzee problem-solving success. Animal Cognition. 17(4), 835-847. DOWNLOAD
Pasquaretta C, Levé M, Claidière N, van de Waal E, Whiten A, Macintosh AJJ, Pelé M, Bergstrom M, Borgeaud C, Brosnan SF, Crofoot M, Fedigan LM, Fichtel C, Hopper LM, Mareno MC, Petit O, Schnoell AV, di Sorrentino PE, Thierry B, Tiddi B & Sueur C. (2014). Social networks in primates: smart and tolerant species have more efficient networks. Scientific Reports 4, 7600. DOWNLOAD
Brosnan SF & Hopper LM. (2014). Psychological limits on animal innovation. Animal Behaviour. 92, 325-332. DOWNLOAD
Finestone E, Bonnie KE, Hopper LM, Vreeman VM, Lonsdorf EV & Ross SR. (2014). The interplay between individual, social, and environmental influences on chimpanzee food choices. Behavioural Processes.105, 71-78. DOWNLOAD
2013
Hopper LM, Holmes AN, Williams LE & Brosnan SF. (2013). Dissecting the mechanisms of squirrel monkey (Saimiri boliviensis) social learning. . PeerJ. 1, e13. DOWNLOAD
Hopper LM, Lambeth SP, Schapiro SJ, Bernacky BJ & Brosnan SF. (2013). The ontogeny of social comparisons in rhesus macaques (Macaca mulatta). Journal of Primatology. 2, 109. DOWNLOAD
Hopper LM, Lambeth SP, Schapiro SJ & Brosnan SF. (2013). When given the opportunity, chimpanzees maximize personal gain rather than “level the playing field”. PeerJ. 1, e165. DOWNLOAD
Freeman HD, Sullivan J, Hopper LM, Talbot CF, Holmes AN, Schultz-Darken N, Williams LE & Brosnan SF. (2013). Different responses to reward comparisons by three primate species PLoS ONE. 8(10), e76287. DOWNLOAD
Ross MR, Gillespie KL, Hopper LM, Bloomsmith MA & Maple TL. (2013). Differential preference for ultraviolet light among captive birds from three ecological habitats. Applied Animal Behaviour Science. 147, 278-285. DOWNLOAD
Freeman HD, Brosnan SF, Hopper LM, Lambeth SP, Schapiro SJ & Gosling SD. (2013). Developing a comprehensive and comparative questionnaire for measuring personality in chimpanzees using a simultaneous top-down/bottom-up design. American Journal of Primatology. 75, 1042-1053. DOWNLOAD
Brosnan SF & Hopper LM. (2013). Cooperation, behavioral diversity and inequity responses .In M. Banaji & S. Gelman (Eds.) Navigating the Social World: What Infants, Children, and Other Species Can Teach Us. (pp. 371-376). Oxford University Press: New York, NY.
2012
Hopper LM, Lambeth SP & Schapiro SJ. (2012). An evaluation of the efficacy of video displays for use with chimpanzees (Pan troglodytes). American Journal of Primatology. 74, 442-449. DOWNLOAD
Hopper LM & Brosnan SF. (2012). Primate cognition. Nature Education Knowledge. 5(8), 3. VIEW HERE
Hopper LM & Whiten A. (2012). The evolutionary and comparative psychology of social learning and culture. In J. Vonk & T. K. Shackelford (Eds.) The Oxford Handbook of Comparative Evolutionary Psychology. (pp.451-473). Oxford University Press: New York, NY.
Hopper LM, Marshall-Pescini S & Whiten A. (2012). Social learning and culture in child and chimpanzee. In F.B.M. de Waal & P.F. Ferrari (Eds.) The Primate Mind: Built to Connect with Other Minds. (pp. 99-118). Harvard University Press: Cambridge, MA.
Caldwell CA, Schillinger K, Evans CL & Hopper LM. (2012). End state copying by humans (Homo sapiens): Implications for a comparative perspective on cumulative culture. Journal of Comparative Psychology. 126, 161-169. DOWNLOAD
2011
Hopper LM, Schapiro SJ, Lambeth SP & Brosnan SF. (2011). Chimpanzees’ socially maintained food preferences indicate both conservatism and conformity. Animal Behaviour. 81, 1195-1202. DOWNLOAD
2010
Hopper LM. (2010). ‘Ghost’ experiments and the dissection of social learning in humans and animals. Biological Reviews. 85, 685-701. DOWNLOAD
Hopper LM, Flynn E, Wood LAN & Whiten A. (2010). Observational learning of tool use in children: Investigating cultural spread through diffusion chains and learning mechanisms through ghost displays. Journal of Experimental Child Psychology. 106, 82-97. DOWNLOAD
Hopper LM. (2010). Deferred imitation in children and apes. Children imitate after a delay, but can apes ape in a similar fashion? The Psychologist. 23, 294-297. VIEW HERE
2009
Whiten A, McGuigan N, Marshall-Pescini S & Hopper LM. (2009). Emulation, imitation, over-imitation and the scope of culture for child and chimpanzee. Philosophical Transactions of the Royal Society B. 364, 2417-2428. DOWNLOAD
2008
Hopper LM, Lambeth SP, Schapiro SJ & Whiten A. (2008). Observational learning in chimpanzees and children studied through ‘ghost’ conditions. Proceedings of the Royal Society B. 275, 835–840. DOWNLOAD
2007
Hopper LM, Spiteri A, Lambeth SP, Schapiro SJ, Horner V & Whiten A. (2007). Experimental studies of traditions and underlying transmission processes in chimpanzees. Animal Behaviour. 73, 1021-1032. DOWNLOAD