- Role of mothers in the acquisition of tool-use behaviours by captive infant chimpanzees
Primate Research Institute, Kyoto University, Inuyama, Kanrin, 484 8506 Aichi, Japan
Anim Cogn 6:235-44. 2003
- An experimental study of leaf swallowing in captive chimpanzees: insights into the origin of a self-medicative behavior and the role of social learning
Michael A Huffman
Primate Research Institute, Kyoto University, 41 2 Kanrin, Inuyama, Aichi 484 8506, Japan
Primates 45:113-8. 2004
..This study provides support for the hypothesis that leaf swallowing originated in the wild from opportunistic feeding behavior and was later passed down in the form of a self-medicative behavioral tradition...
- A note on the responses of chimpanzees (Pan troglodytes) to live self-images on television monitors
Great Ape Research Institute, Hayashibara Biochemical Laboratories Inc, Okayama, Japan
Behav Processes 75:85-90. 2007
- Facial perception of conspecifics: chimpanzees (Pan troglodytes) preferentially attend to proper orientation and open eyes
Hayashibara Biochemical Laboratories, Inc, Great Ape Research Institute, Tamano, Okayama, Japan
Anim Cogn 13:679-88. 2010
..These results suggest the possibility that open eyes play an important role in the configural processing of faces and that chimpanzees perceive and process open and closed eyes differently...
- Chimpanzee social intelligence: selfishness, altruism, and the mother-infant bond
Hayashibara Biochemical Laboratories, Inc, Great Ape Research Institute, 952 2 Nu, Tamano, Okayama, 706 0316, Japan
Primates 50:3-11. 2009
..Mother-infant interactions appear to be particularly important to understanding the manifestation of social intelligence from an evolutionary perspective...
- Chimpanzees (Pan troglodytes) learn to act with other individuals in a cooperative task
Great Ape Research Institute, Hayashibara Biochemical Laboratories, Inc, 952 2 Nu, Tamano, Okayama, 706 0316, Japan
Primates 48:13-21. 2007
..Thus, the chimpanzees could learn to coordinate their behavior through trial and error. Communicative behavior emerged during the task, but the communication differed according to the identity of the partner...
- Brain response to affective pictures in the chimpanzee
Great Ape Research Institute, Hayashibara Co Ltd, Tamano, Okayama, Japan
Sci Rep 3:1342. 2013
..This suggests that at least a part of the affective process is similar between humans and chimpanzees. The results have implications for the evolutionary foundations of emotional phenomena, such as emotional contagion and empathy...
- Event-related potentials in response to subjects' own names: A comparison between humans and a chimpanzee
Hayashibara Biochemical Laboratories, Inc Great Ape Research Institute Okayama, Japan
Commun Integr Biol 4:321-3. 2011
..This may indicate that initial orientation to the sound of one's own name is delayed in the chimpanzee...
- Fetal brain development in chimpanzees versus humans
Primate Research Institute, Kyoto University, Inuyama, Aichi 484 8506, Japan Electronic address
Curr Biol 22:R791-2. 2012
..This suggests that maintenance of fast development of the human brain during intrauterine life has contributed to the remarkable brain enlargement observed in humans...
- Humans and chimpanzees attend differently to goal-directed actions
Graduate School of Education, Kyoto University, Yoshida Honmachi, Sakyo ku, Kyoto 606 8501, Japan
Nat Commun 3:693. 2012
..These findings indicate that humans have a predisposition to observe goal-directed actions by integrating information from the actor...
- The visual strategy specific to humans among hominids: a study using the gap-overlap paradigm
Primate Research Institute, Kyoto University, Inuyama, Japan
Vision Res 51:2348-55. 2011
..peripheral visual stimuli) on the other hand. In particular, humans showed longer saccade latency under the overlap condition compared to the other great apes, which may reflect this species' unique means of visual processing...
- Brain activity in an awake chimpanzee in response to the sound of her own name
Great Ape Research Institute of Hayashibara Biochemical Laboratories, Inc, 952 2 Nu, Tamano, 706 0316 Okayama, Japan
Biol Lett 6:311-3. 2010
..Following stimulus onset, an Nc-like negative shift at approximately 500 ms latency was observed, particularly in response to SON. Such specific ERP patterns suggest that the chimpanzee processes her name differently from other sounds...
- Mechanism of birth in chimpanzees: humans are not unique among primates
Great Ape Research Institute of Hayashibara Biochemical Laboratories Inc, 952 2 Nu, Tamano, 706 0316 Okayama, Japan
Biol Lett 7:686-8. 2011
..Our observations raise the need to reconsider the evolutionary scenario of human birth...
- The formation of the brush-sticks: modification of chimpanzees or the by-product of folding?
Primate Research Institute, Kyoto University, Inuyama, Aichi 484 8506, Japan
Primates 46:183-9. 2005
..We conclude that the vegetation surrounding termite mounds might influence how chimpanzees combine different types of tools, i.e., digging stick, brush-stick and fishing tool, for obtaining termites...
- Mitochondrial DNA genealogy of chimpanzees in the Nimba mountains and Bossou, West Africa
Makoto K Shimada
Division of Population Genetics, National Institute of Genetics, Mishima, Japan
Am J Primatol 64:261-75. 2004
..This suggests that the Bossou-Nimba populations derived only recently from the common ancestral population of the West African chimpanzees, and did not pass through a bottleneck...
- Auditory ERPs to stimulus deviance in an awake chimpanzee (Pan troglodytes): towards hominid cognitive neurosciences
The University of Tokyo, Tokyo, Japan
PLoS ONE 3:e1442. 2008
..However, to date, such studies have rarely been reported in non-human hominid species, due to the practical difficulties in conducting non-invasive measurements on awake individuals...