Ikuma Adachi

Assistant Professor



My long-term research goal is to better understand the evolution of cognitive abilities in human and non-human animals. My current research has focused on whether non-human animals form cross-modal representations of familiar individuals and species as well as underlying perceptual system behind this. I'm also interested in multi-species comparison and I have studied a wide variety of species, including chimpanzees, four species of old-world monkeys, three species of new-world monkeys, pigeons, dogs, horses. These investigations were conducted in the laboratory using both operant and non-operant paradigms to measure cognitive function.

  • Research Keywords:
  • Comparative cognitive science
  • Evolution of cognitive abilities
  • Cognitive development
  • Mnemonic processes
  • Cross-modal representation
  • Cross-modal correspondence
  • Social concepts in non-human animals
  • Intermodal transfer of representations
  • Face recognition
  • Perception of Biological motion


2001(Mar) BA Psychology, Faculty of Letters, Kyoto University, Kyoto, Japan
2003(Mar):MA Psychology, Graduate School of Letters, Kyoto University, Kyoto, Japan
2006(Mar):PhD. Psychology, Graduate School of Letters, Kyoto University, Kyoto, Japan

After completing my degree, I was awarded a JSPS(Japan Society for the Promotion of Science) Postdoctral fellowship for research abroad and moved to the Yerkes National Primate Research Center. I studies social representation in rhesus macaques such as face perception, cross-modal representation, and dominance relationship with Prof Robert Hampton. In 2009, I moved back to Japan to carry my second postdoc at Primate Research Institute, Kyoto University. From 2010, I moved to my current position as an assistant professor in CICAPS.

Selected Publications

  • Adachi I (2014).
    Spontaneous spatial mapping of learned sequence in Chimpanzees: evidence for a SNARC-like effect
    PLoS ONE, 9(3): e90373. doi:10.1371/journal.pone.0090373
  • Dahl CD*, Adachi I* (2013).
    Conceptual metaphorical mapping in chimpanzees (Pan troglodytes)
    eLife, in press
    *Corresponding Authors
  • Dahl CD*, Rasch MJ, Tomonaga M, Adachi I* (2013).
    The face inversion effect in non-human primates revisited - an investigation in chimpanzees (Pan troglodytes)
    Scientific Reports 3, Article number: 2504 doi:10.1038/srep02504
    *Corresponding Authors
  • Dahl CD, Rasch MJ, Tomonaga M, Adachi I (2013).
    Laterality Effect for Faces in Chimpanzees (Pan troglodytes)
    The Journal of Neuroscience, 33(33): 13344-13349, doi: 10.1523/​JNEUROSCI.0590-13.2013
  • Imura T, Adachi I, Hattori Y, Tomonaga M (2013).
    Perception of the motion trajectory of objects from moving cast shadows in infant Japanese macaques (Macaca fuscata)
    Developmental Science, Volume 16, Issue 2, pages 227–233, March 2013
  • Dahl DC*, Rasch MJ, Tomonaga M, Adachi I* (2013).
    Developmental processes in face perception
    Scientific Reports, 3: doi:10.1038/srep01044. *Corresponding Authors
  • Ludwig V*, Adachi I*, Matsuzawa T (2011).
    Visuoauditory mappings between high luminance and high pitch are shared by chimpanzees (Pan troglodytes) and humans
    Proceedings of the National Academy of Sciences, 1112605108v1-201112605.
    * These authors contributed equally to this work and co-corresponding authors of the paper
  • Adachi I, Hampton RR (2011)
    Rhesus monkeys see who they hear: Spontaneous cross-modal memory for familiar conspecifics
    PLoSONE, 6(8): e23345. doi:10.1371/journal.pone.0023345
  • Adachi I, Anderson JM, Fujita K (2011)
    Reverse-Reward Learning in squirrel monkeys (Saimiri sciureus): Five-Year Assessment, and Tests for Qualitative Transfer
    Journal of Comparative Psychology, 125, 84-90
  • Adachi I, Dina P Chou, & Rober R Hampton (2009)
    Thatcher effect in monkeys demonstrates conservation of face perception across primates
    Current Biology, Volume 19, Issue 15, pp. 1270-1273
  • Adachi I (2009)
    Cross-modal representations in primates and dogs: A new framework of recognition of social objects
    Intraction Studies, Volume 10, Issue 2, pp. 225-251
  • Adachi I, Kuwahata H, Fujita K, Tomonaka M, & Matsuzawa T (2009)
    Plasticity of ability to form cross-modal representations in infant Japanese macaques
    Developmental Science, Volume 12, Issue 3, pp 446-452
  • Adachi I & Fujita K (2007)
    Cross-modal representation of human caretakers in squirrel monkeys
    Behavioural Processes, Volume 74, Issue 1, pp. 27-32
  • Adachi I, Kuwahata H, and Fujita K (2007)
    Dogs recall owner's face upon hearing owner's voice
    Animal Cognition, Volume 10, Issue 1, pp. 17-21
  • Adachi I, Kuwahata H, Fujita K, Tomonaga M, and Matsuzawa T (2006)
    Japanese macaques form a multi-modal representation of their own species in their first year of life
    Primates, Volume 47, Issue 4, pp. 350-354


    Center for International Collaboration and
    Advanced Studies in Primatology
    Primate Research Institute, Kyoto University
    41-2 Kanrin, Inuyama, Aichi, 484-8506, Japan

    Fax: +81 (0)568-61-1050