Creative Education 2012. Vol.3, No.4, 533-539 Published Online August 2012 in SciRes (http://www.SciRP.org/journal/ce) http://dx.doi.org/10.4236/ce.2012.34081 Copyright © 2012 SciRes. 533 Influence of Maternal Praise on Developmental Trajectories of Early Childhood Social Competence Ryoji Shinohara1,2, Yuka Sugisawa1,3, Lian Tong1,3, Emiko Tanaka1,3, Taeko Watanabe1,3, Yoko Onda1,3, Yuri Kawashima1,3, Maki Hirano1,3, Etsuko Tomisaki1,3, Yukiko Mochizuki1,3, Kentaro Morita1,3, Gan-Yadam Amarsanaa1,3, Yuko Yato1,4, Noriko Yamakawa1,5, Tokie Anme1,3 1Research Institute of Science and Technology for Society, Japan Science and Technology Agency, Tokyo, Japan 2Center for Birth Cohort Studies, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan 3Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaragi, Japan 4College of Letters, Ritsumeikan University, Kyoto, Japan 5Clinical Research Institute, Mie-Chuo Medical Center National Hospital Organization, Mie, Japan Email: rshinohara@yamanashi.ac.jp Received April 27th, 2012; revised May 25th, 2012; accepted June 12th, 2012 We aimed to clarify the effects of the praise of mothers on their 18-month-old offspring by tracing the trajectory of the latters’ social competence from this time to 30 and 42 months. The participants were 226 mother-child dyads whose interaction was observed when the children were 18, 30, and 42 months old. The features of mother-child interaction, and specifically the social proficiency of the children, were ex- amined using the Interaction Rating Scale (IRS) as an aspect of social competence. Our findings indicate that caregivers’ praise of 18-month-old children is very important in promoting a high-level trajectory of child social competence from that time to 30 and 42 months. It is hoped that caregivers and health care professionals will use these findings appropriately when providing care giving support to parents. Keywords: Child Development; Praise; Social Competence; Caregiver-Child Interaction; Longitudinal Study Introduction Many studies suggest that positive parenting behavior is as- sociated with the development of social competence in children. A secure parent-child attachment, which partly flows from the sensitivity and responsiveness of the caregiver, provides chil- dren with personal resources, such as emotional security and a sense of autonomy. Subsequently, these resources empower children to explore peer relationships (Ainsworth et al., 1978; Belsky et al., 1984; Lamb et al., 1985). Children derive work- ing models from attachment relationships to their parents, that is, they internalize an enduring blueprint or a set of expecta- tions concerning the operation of interpersonal relationships in general (Bowlby, 1969; Sroufe & Fleeson, 1985). In addition, parental warmth and engagement are associated with prosocial behavior among young peers (Attili, 1989; Hinde & Tamplin, 1983). Mothers who are constructive and agreeable tend to have children who exhibit similar forms of behavior in their own interactions with others (Putallaz, 1987). Inductive disciplinary styles, in which parents emphasize reasoning, are predictive of children’s use of prosocial behavior (Becker, 1964; Zahn- Waxler et al., 1979). Within positive parent-child relationships, “praise” is the one of the most important factors leading to the development early social skills. Previous studies on “praise” suggest that a par- ent’s constructive verbal feedback is related to a child’s achieve- ment incentive in the early stage of development (Kamins & Dweck, 1999; Kelly et al., 2000); furthermore, a high frequency of praise is related to high self-esteem in the child (Felson & Zielinski, 1989; Kelly et al., 2000; Stipek et al., 1992). How- ever, these reports focus on a 14-year-old child, who had been followed from 2 years of age. Few similar studies on toddlers exist in the literature. With the increase in the antisocial behavior and aggression of school-aged children, the development of social competence in youngsters is of high interest. Health care and welfare special- ists must urgently develop an evaluation method for assessing the development of social competence in children and for em- ploying it to support childcare. However, Japan, possesses few such methods. Therefore, we developed a Japanese version of the Interaction Rating Scale (IRS), which can be easily and accurately used to assess several aspects of social competence in children. The reliability and validity of the IRS is found to be satisfactory in another study (Anme et al., 2007; Anme et al., 2010). In a previous study, we examine the longitudinal relationship between the social competence of children at 18 months of age and the caregiver’s attitude of “praise,” with particular empha- sis on the change in child attitudes at 4 and 9 months of age, after controlling for confounding factors. We find that the “praise” of caregivers influenced children’s social competence at 18 months of age (Shinohara et al., 2009; Shinohara et al., 2010). In an effort to trace the impact of such praise over time, we go on to assess the children’s social competence at 30 and 42 months and indicate the changes in their attitudes from the time when these youngsters were 4 and 9 months old. We place
R. SHINOHARA ET AL. particular emphasis on the actual behaviors of caregivers ex- tending praise, in a situation involving mothers and 18-month- old children. We use a group-based semiparametric approach (Nagin, 1990: Nagin, 2005) to analyze the trajectory social competence development in children. This statistical technique enables us to evaluate subgroups of participants, multiple patterns of change in the outcome, and the shape of the change over time, etc. This model can be estimated using The SAS Trajectory Procedure “ProcTraj” described in Jones, Nagin, and Roeder (2001), and Jones and Nagin (2007). Further, Arrandale, Koehoorn, Mac- Nab, and Kennedy (2006) offer explanations of “ProcTraj”. The present study is longitudinal in nature and examines re- lationship between three variables: first, the trajectory of social competence in children from 18 months to 30 and 42 months; second, the actual behaviors of caregivers offering praise at 18 months; and finally, the change in the attitudes of children over time, beginning at 4 and 9 months. Demographic variables with the potential to influence this relationship are controlled for. The actual behaviors of caregivers offering praise to 18-month- old children are emphasized. Methods Participants and Overview Data was obtained from 231 mother-child dyads enrolled in a longitudinal study of social development conducted as part of a project initiated by the Japan Science and Technology Agency (JST). The children and their parents were recruited from two Japanese cities (Mie and Osaka). Laboratory-based videotaped observations of all dyads were made three times, once when the children were18 months old in 2007, and the others at 30 and 42 months, in 2008 and 2009 respectively. However, the ana- lyses are restricted to the 226 dyads for which the mothers pro- vided demographic data and completed a questionnaire on their attitudes towards the importance of praise when their children were 4 months and 9 months old. All mothers gave informed written consent before participating in the study, the protocol of which was approved by the ethics committee of the JST. Measures Demographic data and attitudes regarding praise were ob- tained from the questionnaire. Demographic variables include the gender of the child, the presence of siblings, the family type (nuclear or extended), and the age of the mother (see Table 1). The item addressing the caregiver’s attitude towards the impor- tance of praise is termed “Praising child”; it has four response options: 1) Not at all important; 2) Of minor importance; 3) Fairly important; and 4) Very important (see Table 2). Table 1. Demographic information. Variable Category n % Gender Boy 0 116 51.3 Girl 1 110 48.7 0 115 50.9 1 88 38.9 2 22 9.7 Numbers of sibl ings 3 1 0.5 Family type Nuclear 0 193 85.4 Extended 1 33 14.6 Mother’s age 20 - 29 57 25.2 30 - 39 158 69.9 40 - 49 Continuous variable 11 4.9 Table 2. Caregiver’s attitude towards the importance of praise. Respondent Child’s age (months) Attitude Category n % 1. Not at all important 0 0.0 2. Of minor importance 0 0.0 3. Fairly important 0 10 4.4 4 4. Very important 1 21695.6 1. Not at all important 0 0.0 2. Of minor importance 1 0.4 3. Fairly important 0 12 5.3 Mother 9 4. Very important 1 21394.3 The IRS was used to assess social competence in children and child-rearing competence in mothers. This measure has 10 subscales, five addressing each of the child-related and care- giver-related factors*. Scores for all IRS subscales are derived from laboratory-based observations of mother-child interactions. The 36 items of the IRS are based on items of the Nursing Child Assessment Satellite Training (NCAST) teaching scales (Sumner & Spietz, 1994); we also refer to the Home Observa- tion for Measurement of the Environment (HOME; Caldwell & Bradley, 1984) and the Social Skills Rating Systems (SSRS; Gresham & Elliot, 1990). *The child-related subscales are 1) Autonomy: Child initiates interaction with caregiver; 2) Responsiveness: Child is responsive to caregiver’s be- havioral cues; 3) Empathy: Child behaves in accord with caregiver’s affec- tive expression; 4) Motor regulation: Child’s behavior is clearly directed toward the task and he/she is not overactive/underactive; and 5) Emotional regulation: Child adjusts his/her emotional state to a comfortable level. The caregiver-related subscales are 6) Respect for the development of autonomy Partner encourages child’s autonomy; 7) Respect for the development o responsiveness: Partner encourages child’s responsiveness; 8) Respect for the development of empathy: Partner encourages the child to develop em- pathy; 9) Respect for cognitive development: Caregiver encourages child’s cognitive development; and 10) Respect for social-emotional development: Caregiver encourages child’s social-emotional development. The internal consistencies (Cronbach’s alpha = α) ofIRS (Sugisawa et al., 2010) were as follows. The internal consis- tency of the whole level of IRS was 0.91, and the α values in the domains of the child and caregiver were 0.88 and 0.85, respectively. Regarding the internal consistencies in the five subscales related to the child, the child’s 1) Autonomy (α = 0.74); 2) Responsiveness (α = 0.61); 3) Empathy (α = 0.70); 4) Motor regulation (α = 0.43) and (5) Emotional regulation (α = Copyright © 2012 SciRes. 534
R. SHINOHARA ET AL. 0.66). In the subscales related to thecaregivers; 6) Respect for the development of autonomy (α = 0.59); 7) Respect for the development of responsiveness (α = 0.62); 8) Respect for the development of empathy (α = 0.43); 9) Respect for cognitive development (α = 0.70); and (10) Respect for social-emotional development (α = 0.45). Regarding the validity of IRS (Sugi- sawa et al., 2010), pearson’s correlation coefficient between IRS and NCATS total scores was 0.89 (p < 0.001), the coeffi- cient of correlation between the child’s total IRS and total scores NCATS was 0.70 (p < 0.001), and the coefficient of correlation between the caregiver’s total IRS and total scores NCATS was 0.98 (p < 0.001). For the actual behaviors of caregivers offering praise, we use the two following items of the subscale (7): (7)-1. Caregiver praises child’s efforts at least once during the episode; (7)-2. Caregiver verbally praises child during the episode. Mother-Child Interactions Mother-child interactions took place in a playroom (4 m × 4 m) that was furnished with a small table and a child-sized chair and that contained toys (small dolls, mini cars, and plastic toys). This was a relatively natural setting, conducive both to sponta- neous interaction and to a certain degree of experimental con- trol. The play activity was standardized in being restricted to building blocks, an age-appropriate activity popular in Japan, and began when the each parent was given a box containing the blocks. Her child then took the blocks from the box, played with them, and then put them back in the box. Mothers were asked to play with their children as they would normally at home (providing instructions or help). The play activity lasted for 5 minutes. Three mother-child interactions were allowed in each task. Children who completed the task on the first attempt were not asked to perform additional tasks. Mother-child inter- actions were videotaped from five different angles (cameras were in each corner of the room and on the ceiling) and sound- recorded. Coding of Mother-Child Interactions Coders had to be sensitive to the cues of both mothers and children. In the latter, such clues were often ambiguous or con- fusing and quite transitory. Sensitivity was achieved via one month of training in the coding of videotaped parent-child in- teractions. The coders, doctoral or master’s students, achieved at least 80% inter-rater agreement during training with pilot tapes. The reliability of the coding procedure was evaluated by having two coders each analyze a sample of tapes from the study (25% of the total) and was verified if the inter-rater agreement attained 87%. Data Treatment Attitude Variables Responses to the “Praising child” item were converted to a binary variable, with the response option “Very important” assigned a score of 1 (positive attitude) and all other response options assigned a score of 0 (negative attitude). From these values we construct a variable representing the transition of the attitude towards praise across the period at which the child was 4 months and 9 months old (see Table 3). This variable (Atti- tude variables) has four categories: 0, reflecting a negative atti- tude at both ages (consistently negative); 1, reflecting a change Table 3. Caregiver’s change of attitude towards the importance of praise. Binary variable Respondent 4 months9 months Attitude variables n % 0 0 0 4 1.8 1 0 1 9 4.0 0 1 2 6 2.7 Mother 1 1 3 20791.5 in attitude from positive at 4 months to negative at 9 months (inconsistently negative); 2, reflecting a change in attitude from negative at 4 months to positive at 9 months (inconsistently positive); and 3, reflecting a positive attitude at both ages (con- sistently positive). Behavior Dummy Variables The two items measuring praise (Behavior variables) are (7)-1 Caregiver praises child’s efforts at least once during the episode (yes = 1, no = 0) and (7)-2 Caregiver verbally praises child more than once during the episode (yes = 1 no = 0). From these values we construct the dummy variables (Behavior dummy variables: X1, X2, X3), representing the occurrence of the two items (see Table 5). Children’s Social Competence Child-related subscale items of the IRS were assigned a score of 1 if coded as “yes” and a score of 0 if coded as “no”; the summed score across all five subscales constitute the child’s total score (maximum = 25). The summed score at 18, 30, and 42 months was calculated. Statistical Approach The Statistical Analysis System (SAS) statistical package (Ver. 9.1) was used for the analysis. In performing this task, we calculated the descriptive demographic data, the attitude vari- ables, the behavior variables, the behavior dummy variables, and the children’s social competence at three points. The tra- jectories of children’s social competence from 18 months to 30 and then to 42 months were estimated by using a group-based semiparametric approach (Nagin, 1990; Nagin, 2005). This meth- od focuses on describing the trajectory, or pattern, of change over time in the dependent variables, and the ProcTraj estimates a regression model for each discrete group within the popula- tion (Arrandale, Koehoorn, MacNab, & Kennedy, 2006). The Bayesian information criteria (BIC) were used to decide on the optimum number of groups. In the ProcTraj procedure, the BIC values given in the output are negative; the best-fit model is the one with the smallest negative number (Jones, Nagin, & Roeder, 2001; Arrandale et al., 2006). After deciding on the optimum number of groups, we estimated the relationship between the trajectories of children’s social competence, the attitude vari- ables, and the behavior dummy variables. Results The demographic details, the attitude variables, the behavior variables, the behavior dummy variables, and the children’s Copyright © 2012 SciRes. 535
R. SHINOHARA ET AL. social competence at three points of the 226 mother-child dyads who participated in this study are summarized in Tables 1-6. A group-based semiparametric approach (Nagin, 1990: Na- gin, 2005) enables us to evaluate subgroups of participants, multiple patterns of change in the outcome, and the shape of the change over time. To analyze the trajectory social competence development in children and evaluate subgroups of participants, we calculated the BIC values from one to four groups. The optimum number of groups was two (the BIC = −1332.72) (see Table 7). Therefore, for the trajectory of children’s social com- petence, two groups (Low group vs High Group) were adopted in this study (see Figure 1). There was a general trend for each child’s social competence to increase with age. In addition, to analyze the relationship between the trajectory social competence development in children from 18 to 42 months of age and the caregiver’s behavior of “praise” when Table 4. Distribution of behavior variables. Variable Category n % (7)-1 Praise no 0 64 28.3 yes 1 162 71.7 (7)-2 Praise no 0 77 34.1 yes 1 149 65.9 Note: (7)-1 Praise: caregiver praises the child’s efforts at least once during the episode; (7)-2 Praise: caregiver verbally praises the child during the episode. Table 5. Distribution of behavior dummy variables. Behavior variables Behavior dummy variables (7)-1 Praise (7)-2 Praise n % X1 0 0 62 27.4 0 0 0 0 1 15 6.6 1 0 0 1 0 2 1.0 0 1 0 1 1 147 65.0 0 0 1 Note: (7)-1 Praise: caregiver praises the child’s efforts at least once during the episode; (7)-2 Praise: caregiver verbally praises the child during the episode. Table 6. Child’s social competence at three points of age. Child’s social competence Age of child Mean SD 18 months 21.420 3.545 30 months 22.452 2.944 42 months 22.961 2.565 19 20 21 22 23 24 18 30 42 IRSscore Months Highgroup Lowgroup Figure 1. Development trajectories of child’s social competencefrom 18 to 42 months. their children were 18 months of age, multinomial logistic re- gressions in the ProcTraj carried out. The results show that after controlling for the effects of the demographic data, in the direction of the High group based on the Low group, the attitude variables (β = 1.203, p = 0.036) and the behavior dummy variables X3 (β = 2.619, p = 0.005) were significantly related to the trajectory of the children’s social competence (Low group vs High Group). Additionally, for the demographic data, the results reveal that the gender of the child (Girls: β = 1.889, p = 0.026), siblings (Yes: β = 1.024, p = 0.045) was significantly related to the trajectory of social com- petence (Low Group vs High Group) (see Table 8). Discussion Characteristics of This Research This study is unique in the following respects. In Japan, there are few previous studies to assess the trajectory social compe- tence development in infancy. We examined the longitudinal- relationship between the trajectory social competence devel- opment in children from 18 to 42 months of age and the par- ent’s attitude towards the importance of praising the child when he/she was 4 or 9 months old, and the caregiver’s behavior of “praise” when their children were 18 months of age. Meanwhile, this research has limitations that hinder gener- alization because the participants were those who live in two cities. Moreover, the number of participants was low. However, the use of the results can be expected given that the subjects represent ordinary families in Japan. The Trajectory of Children’s Social Competence and the Caregi ver’s Behavior of “Pr ai s e” The children were active and had more potential than we ex- pected, although they could not have managed without their mothers’ help and support. White (1959) explains the rich po- tential of competence encouragement in ensuring the healthy development of a child. Competence is defined as those “abili- ties [though which] the person is effectively related with the environment.” In the development of a child’s competence, his/her mother’s response to him/her is important; that is, the Copyright © 2012 SciRes. 536
R. SHINOHARA ET AL. Copyright © 2012 SciRes. 537 Table 7. The optimal number of trajectories (Liner model). Numbers of groups Group number n (%) Intercept p value Linear (β) p value BIC 1 1 100.0 20.294 <0.001 0.097 <0.001 −1333.22 1 31.0 16.286 <0.001 0.146 0.003 2 2 69.0 22.161 <0.001 0.071 0.010 −1332.72 1 25.5 14.642 <0.001 0.192 <0.001 2 21.3 17.978 <0.001 0.289 0.039 3 3 53.2 23.261 <0.001 0.004 0.944 −1338.17 1 25.5 14.642 <0.001 0.192 <0.001 2 21.3 17.978 <0.001 0.289 0.039 3 47.2 23.261 <0.001 0.004 0.965 4 4 6.0 23.262 0.178 0.004 0.994 −1346.30 N = 226; BIC: Bayesian information criterion. Table 8. Multinominal logistic analyses for predicting child’s social competence trajectories group memberships. Low vs High Independent variables β p value Constant −4.659 0.132 Gender (based on boy) 1.889 0.026 Numbers of siblings (based on 0 person) 1.024 0.045 Family type (based on nuclear family) −0.691 0.502 Mother’s age (continuous variable) −0.065 0.397 Attitude variables (based on 0) 1.203 0.036 Behavior dummy variables (based on 0) X1 2.522 0.123 X2 15.503 0.994 X3 2.619 0.005 accumulation of quick and appropriate responses of the mother to her child’s needs (the baby’s cries, calls for help, etc.) leads to the development of the child’s self-esteem. An infant’s posi- tive response to the environment affects the development of his/her social competence later on in life. However, regarding the parent-child interaction after infancy, many studies show that the more positive the parent-child in- teraction, the higher the child’s level of social competence later in life. Mothers with high levels of social competence and their children display more positive behaviors and emotions (La- Freniere & Dumas, 1992), and the extent to which mothers give their children autonomy during play and teaching predicts posi- tive assertiveness in preschoolers (Denham et al., 1990). This outcome is explained by the constructive response of mother to their children’s emotions (Eisenberg et al., 1996); the latter then imitate these social and emotional behavioral patterns (Putallaz, 1987). In a recent neuroscience study, 19 college students partici- pated in functional magnetic resonance imaging (fMRI) ex- periments involving monetary and social rewards. Izuma et al. reported that the acquisition of a good reputation robustly acti- vates reward-related brain areas, notably the striatum, and these overlap with the areas activated by monetary rewards (Izuma et al., 2008). This research suggests that the attitudes of parents toward positive interactions with their child, particularly through the use of praise, has a very significant effect on the development of their children’s social competence later in life. Such praise at 18 months influences the trajectory of social competence in children from 18 to 30 and 42 months. A follow-up study should be conducted to further clarify the mechanism underly- ing the effect of interactions involving praise, one that consid- ers not just the praise-related behaviors of mothers but also those of fathers. It is hoped that caregivers and health care pro- fessionals will use these findings appropriately when providing parenting support to parents. Acknowledgements The research described in this report received financial sup- port from the R&D Area “Brain-Science & Society” of JST/ RISTEX as part of the “Exploration of factors affecting chil- dren’s cognitive and behavioral development in Japan” project. We are grateful to all of the researchers in groups cooperating on this project, and to all of the families who participated in the study. And this research was supported by the Grants-in-Aid for Scientific Research (23330174). REFERENCES Ainsworth, M. S., Blehar, M. C., Waters, E., & Wall, S. (1978). Pat- terns of attachment: A psychological study of the Strange Situation. Hillsdale, NJ: Lawrence Erlbaum Associates. Anme, T., Yato, Y., Shinohara, R., &Sugisawa, Y. (2007). The reliabil- ity and validity of the assessment method for children’s social com- petence: Parent-child interaction rating scale. Japanese Journal of Human Science of Heal th-Social Services, 14, 23-31 Anme, T., Shinohara, R., Sugisawa, Y., Tong, L., Tanaka, E., Watanabe, T., Onda, Y., Kawashima, Y., Hirano, M., Tomisaki, E., Mochizuki,
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R. SHINOHARA ET AL. Appendix Japan Children’s Study Group Chairmen Zentaro Yamagata (Department of Health Sciences, School of Medicine, University of Yamanashi), Hideaki Koizumi (Ad- vanced Research Laboratory, Hitachi, Ltd.) Participating Researchers Kevin K. F. Wong, Yoko Anji, Hiraku Ishida, Mizue Iwasaki, Aya Kutsuki, Misa Kuroki, Haruka Koike, Daisuke N. Saito, Akiko Sawada, Yuka Shiotani, Daisuke Tanaka, Shunyue Cheng, Hiroshi Toyoda, Kumiko Namba, Tamami Fukushi, Tomoyo Morita, Hisakazu Yanaka (Research Institute of Sci- ence and Technology for Society, Japan Science and Technol- ogy Agency), Yoichi Sakakihara (Department of Child Care and Education, Ochanomizu University), Kanehisa Morimoto (Graduate School of Medicine, Osaka University), Kayako Nakagawa (Graduate School of Engineering, Osaka University), Shoji Itakura (Graduate School of Letters, Kyoto University), Kiyotaka Tomiwa (Graduate School of Medicine, Kyoto Uni- versity), Shunya Sogon (The Graduate Division of the Faculty of Human Relations, Kyoto Koka Women’s University), Toyo- jiroMatsuishi (Department of Pediatrics and Child Health, Ku- rume University), Tamiko Ogura (Graduate School of Humani- ties, Kobe University), Masako Okada (Koka City Educational Research Center), Hiroko Ikeda (National Epilepsy Center Shizuoka Institute of Epilepsy and Neurological Disorder), Norihiro Sadato (National Institute for Physiological Sciences, National Institutes of Natural Sciences), Mariko Y. Momoi, Hirosato Shiokawa, Takanori Yamagata (Department of Pediat- rics, Jichi Medical University), Tadahiko Maeda, Tohru Ozaki (The Institute of Statistical Mathematics, Research Organiza- tion of Information and Systems), Tokie Anme (Graduate School of Comprehensive Human Sciences, University of Tsu- kuba), Takahiro Hoshino (Graduate School of Arts and Sci- ences, The University of Tokyo), Osamu Sakura (Interfaculty Initiative in Information Studies, The University of Tokyo), Yukuo Konishi (Department of Infants' Brain & Cognitive De- velopment, Tokyo Women's Medical University), Katsutoshi Kobayashi (Center for Education and Society, Tottori Univer- sity), Tatsuya Koeda, Toshitaka Tamaru, Shinako Terakawa, Ayumi Seki, Ariko Takeuchi (Faculty of Regional Sciences, Tottori University), Hideo Kawaguchi (Advanced Research Laboratory, Hitachi, Ltd.), Sonoko Egami (Hokkaido Univer- sity of Education), Yoshihiro Komada (Department of Pediatric and Developmental Science, Mie University Graduate School of Medicine Institute of Molecular and Experimental Medicine), Hatsumi Yamamoto, Motoki Bonno, Noriko Yamakawa (Clini- cal Research Institute, Mie-chuo Medical Center, National Hos- pital Organization), Masatoshi Kawai (Institute for Education, Mukogawa Women’s University), Yuko Yato (College of Let- ters, Ritsumeikan University), Koichi Negayama (Graduate School of Human Sciences, Waseda University). Copyright © 2012 SciRes. 539
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