Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-BLACKWELL  

Young children occasionally draw rotated figures such as an inverted face; however, little is known about the details of this phenomenon. In this paper, we addressed when and how rotated drawing emerges in normal child development. Study 1 reported that rotated drawings appeared spontaneously in a longitudinal observation of 33 children. The rotation occurred in 6.3% of all representational figures in free drawing trials, whereas 12.5% of representational drawing occurred in imitation task trials, among children 2 years and 11 months to 4 years and 11 months old. To clarify the developmental process in which rotated figures emerge, Study 2 investigated the different ages of children as to whether triggering stimuli cause them to draw rotated images. Rotation occurred more frequently in younger children who begin to produce representational drawing, and they seem to be indifferent to the orientation used in drawing representations. We discuss the reflection of the development of the concept to represent an object as well as the development of spatial cognition by the "viewer-centered" and "viewpoint-independent" referential frame in representational space on a picture-plane.

DOI： 10.1111/j.1468-5884.2011.00495.x

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Landes Bioscience   Participation form：Joint(The vice charge)  

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：心理学評論刊行会  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：the Public Library of Science   Participation form：Joint(The vice charge)  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ROYAL SOC  

The brain activity of a fully awake chimpanzee being presented with her name was investigated. Event-related potentials (ERPs) were measured for each of the following auditory stimuli: the vocal sound of the subject's own name (SON), the vocal sound of a familiar name of another group member, the vocal sound of an unfamiliar name and a non-vocal sound. Some differences in ERP waveforms were detected between kinds of stimuli at latencies at which P3 and Nc components are typically observed in humans. 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.

DOI： 10.1098/rsbl.2009.0864

Web of Science

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本赤ちゃん学会  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：PUBLIC LIBRARY SCIENCE  

Background. For decades, the chimpanzee, phylogenetically closest to humans, has been analyzed intensively in comparative cognitive studies. Other than the accumulation of behavioral data, the neural basis for cognitive processing in the chimpanzee remains to be clarified. To increase our knowledge on the evolutionary and neural basis of human cognition, comparative neurophysiological studies exploring endogenous neural activities in the awake state are needed. 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. Methodology/Principal Findings. We measured auditory event-related potentials (ERPs) of a fully awake chimpanzee, with reference to a well-documented component of human studies, namely mismatch negativity (MMN). In response to infrequent, deviant tones that were delivered in a uniform sound stream, a comparable ERP component could be detected as negative deflections in early latencies. Conclusions/Significance. The present study reports the MMN-like component in a chimpanzee for the first time. In human studies, various ERP components, including MMN, are well-documented indicators of cognitive and neural processing. The results of the present study validate the use of noninvasive ERP measurements for studies on cognitive and neural processing in chimpanzees, and open the way for future studies comparing endogenous neural activities between humans and chimpanzees. This signifies an essential step in hominid cognitive neurosciences.

DOI： 10.1371/journal.pone.0001442

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE INC  

This study describes the developmental course of the social context of feeding behavior in infants and yearlings of Japanese macaques in a provisioned free-ranging troop. Results of this longitudinal study revealed that infants and yearlings exhibited synchronous feeding behavior in the majority of cases in which they had feeding neighbors within I m. They consistently showed feeding behavior more often when their closest neighbor fed than when they did not. In feeding situations, infants tended mainly to be in close proximity with their mothers in the early stages of life and, later, also with peers. The results imply that potential opportunities for the social transmission of food selection habits are available for young Japanese macaques in the wild. (c) 2005 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.infbeh.2005.04.001

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

We investigated infant response toward novel food in captive chimpanzees under the condition in which they can explore such items freely together with their mother. Infants first approached novel foods rather than familiar ones when presented simultaneously. However, they did not ingest novel food immediately, but always sniff-licked it first. Infants tended to pay attention to their mothers before mouthing or ingesting novel foods themselves, but never did so with familiar ones. In response to the infant's activity, mother chimpanzees were tolerant rather than actively interfering. Those results imply that chimpanzee infants respond to novel foods in a neophobic way and refer to their mother for some kind of cue before attempting to ingest them. (C) 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.beproc.2004.09.002

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Newborn humans are known to show specific facial expressions in response to various kinds of taste stimuli and are presumed to be able to discriminate those kinds of tastes from just after birth. As the closest relatives to humans, the taste reactivity (threshold, preference and taste-elicited facial expression) of non-human primates has long been of great interest. To date, however, there have been few investigations in newborn non-human primates. In the present study, we investigated the facial expressions elicited in response to four basic taste stimuli, sweet, salty, sour and bitter, in the newborns of two non-human primate species, rhesus macaques and chimpanzees. The taste-elicited facial expressions were compared among the kinds of taste stimuli and between the two species. Rhesus macaques of less than 7 days old showed different patterns of facial expressions for water/sweet than for bitter, and chimpanzees less than 30 days old did so for sweet and bitter. The differences between these two species were evident in the presence and absence of certain facial expressions and the emerging patterns of certain components for each stimulus. In particular, chimpanzee response patterns to the bitter stimulus resembled to those of humans rather than rhesus macaques. Overall, rhesus macaques and chimpanzees responded differently to the same kinds of tastes, presumably reflecting differences in their evolutionary backgrounds. (C) 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.bbr.2004.02.014

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER TOKYO  

Food sharing among chimpanzees is known to occur particularly between mothers and infants and has been proposed to be a form of parental investment. To explore the function of food sharing, it is essential to know how and what is transferred to an infant from its mother. We investigated details of interactions leading to food transfer and characteristics of items transferred in three mother-infant ( < 2 years old) pairs in captivity. We gave one kind of fruit or vegetable to a mother and observed interactions between the mother and her infant. Tested items consisted of familiar and novel foods for infants. Two patterns of direct food transfer, so-called sharing, were recognized: (1) "infant-initiated sharing" in which the infant attempted to take food and the mother did not resist, and (2) "mother-initiated sharing" in which the mother spontaneously offered a part of her food without the infant's attempts to take it. There were clear differences in the characteristics of items transferred in these two patterns of sharing. In infant-initiated sharing, palatable parts of the same food that the mother was eating were transferred. In contrast, in mother-initiated sharing, only unpalatable parts of food in the mother's possession were transferred. Mothers seemed to be reluctant to give nutritious foods to their infants during this study period. Infants, rather than mothers, were responsible for initiating and experiencing the diversity of adult foods in chimpanzees.

DOI： 10.1007/s10329-004-0085-9

Web of Science

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：岐阜  

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Kyoto  

Presentation type：Public lecture, seminar, tutorial, course, or other speech  

取材協力

取材協力

公開講座講師

公開講座講師/赤ちゃん学入門講座/大阪

その他/熊本発！発達支援者要請プロジェクト第6回勉強会/九州ルーテル学院大学/熊本