Juko Ando - Academia.edu (original) (raw)

Papers by Juko Ando

The Proceedings of the Annual Convention of the Japanese Psychological Association, Sep 11, 2012

This study examined whether universality of the 5-factor model (FFM) of personality operationaliz... more This study examined whether universality of the 5-factor model (FFM) of personality operationalized by the Revised NEO Personality Inventory is due to genetic influences that are invariant across diverse nations. Factor analyses were conducted on matrices of phenotypic, genetic, and environmental corre-lations estimated in a sample of 1,209 monozygotic and 701 dizygotic twin pairs from Canada, Germany, and Japan. Five genetic and environmental factors were extracted for each sample. High congruence coefficients were observed when phenotypic, genetic, and environmental factors were compared in each sample as well as when each factor was compared across samples. These results suggest that the FFM has a solid biological basis and may represent a common heritage of the human species.

proposed that the Big Five personality traits showed a higher-order structure with 2 factors he l... more proposed that the Big Five personality traits showed a higher-order structure with 2 factors he labeled ␣ and ␤. These factors have been alternatively interpreted as heritable components of personality or as artifacts of evaluative bias. Using structural equation modeling, the authors reanalyzed data from a cross-national twin study and from American cross-observer studies and analyzed new multimethod data from a German twin study. In all analyses, artifact models outperformed substance models by root-mean-square error of approximation criteria, but models combining both artifact and substance were slightly better. These findings suggest that the search for the biological basis of personality traits may be more profitably focused on the 5 factors themselves and their specific facets, especially in monomethod studies.

Etiology of factor structure in the Kaufman Assessment Battery for Children Sub Title Author 藤澤, ... more Etiology of factor structure in the Kaufman Assessment Battery for Children Sub Title Author 藤澤, 啓子(Fujisawa, Keiko K.) 安藤, 寿康(Ando, Juko) Publisher Centre for Advanced Research on Logic and Sensibility The Global Centers of Excellence Program, Keio University Publication year 2012 Jtitle CARLS series of advanced study of logic and sensibility Vol.5, (2011. ) ,p.119126 Abstract Notes I. Study of Logic and Sensibility

Twin Research and Human Genetics, 2001

Journal of Affective Disorders, 2021

Psychological Medicine, 2019

Background The phenotypic and aetiological architecture of depression symptomatology has been mos... more Background The phenotypic and aetiological architecture of depression symptomatology has been mostly studied in Western samples. In this study, we conducted a genetically informed factor analysis to elucidate both the phenotypic and aetiological architectures of self-reported depression among a Japanese adult twin sample. Methods Depressive symptoms assessed by Zung's Self-rating Depression Scale were self-rated by 425 twin pairs (301 monozygotic and 124 dizygotic twin pairs) in a community sample in Japan. Results An exploratory factor analysis extracted three symptom domains representing cognitive, affective and somatic symptomatology. A confirmatory factor analysis demonstrated that a bi-factor solution fitted better than the alternative solutions, implying that depression may be defined as a combination of a single general construct and three factors specific to each of the three symptom domains. A multivariate genetic analysis with the bi-factor solution showed that the gen...

Journal of Personality and Social Psychology, 2018

Frontiers in psychology, 2015

Why does decision making differ among individuals? People sometimes make seemingly inconsistent d... more Why does decision making differ among individuals? People sometimes make seemingly inconsistent decisions with lower expected (monetary) utility even when objective information of probabilities and reward are provided. It is noteworthy, however, that a certain proportion of people do not provide anomalous responses, choosing the alternatives with higher expected utility, thus appearing to be more "rational." We investigated the genetic and environmental influences on these types of individual differences in decision making using a classical Allais problem task. Participants were 1,199 Japanese adult twins aged 20-47. Univariate genetic analysis revealed that approximately a third of the Allais problem response variance was explained by genetic factors and the rest by environmental factors unique to individuals and measurement error. The environmental factor shared between families did not contribute to the variance. Subsequent multivariate genetic analysis clarified that d...

Behavior Genetics

Working memory (WM) encompasses both short-term memory (storage) and executive functions that pla... more Working memory (WM) encompasses both short-term memory (storage) and executive functions that play an essential role in all forms of cognition. In this study, the genetic structure of storage and executive functions engaged in both a spatial and verbal WM span task is investigated using a twin sample. The sample consists of 143 monozygotic (MZ) and 93 dizygotic (DZ) Japanese twin pairs, ages 16 to 29 years. In 155 (87 MZ, 62 DZ) of these pairs, cognitive ability scores from the Kyodai Japanese IQ test are also obtained. The phenotypic relationship between WM and cognitive ability is confirmed (r = 0.26–0.44). Individual differences in WM storage and executive functions are found to be significantly influenced by genes, with heritability estimates all moderately high (43%–49%), and estimates for cognitive ability comparable to previous studies (65%). A large part of the genetic variance in storage and executive functions in both spatial and verbal modalities is due to a common geneti...

Twin Research and Human Genetics, 2005

The Japanese Journal of Personality, 2011

Twin Research and Human Genetics, 2013

The Keio Twin Research Center has conducted two longitudinal twin cohort projects and has collect... more The Keio Twin Research Center has conducted two longitudinal twin cohort projects and has collected three independent and anonymous twin data sets for studies of phenotypes related to psychological, socio-economic, and mental health factors. The Keio Twin Study has examined adolescent and adult cohorts, with a total of over 2,400 pairs of twins and their parents. DNA samples are available for approximately 600 of these twin pairs. The Tokyo Twin Cohort Project has followed a total of 1,600 twin pairs from infancy to early childhood. The large-scale cross-sectional twin study (CROSS) has collected data from over 4,000 twin pairs, from 3 to 26 years of age, and from two high school twin cohorts containing a total of 1,000 pairs of twins. These data sets of anonymous twin studies have mainly targeted academic performance, attitude, and social environment. The present article introduces the research designs and major findings of our center, such as genetic structures of cognitive abilit...

Twin Research and Human Genetics, 2012

This study examined the link between sibling relationships and children's social adjustment b... more This study examined the link between sibling relationships and children's social adjustment by comparing twin siblings and siblings with different ages (singleton siblings), and clarified the role of reciprocity in sibling relationships on children's social development. Mothers of 58 monozygotic twin pairs, 48 dizygotic twin pairs, and 86 singleton sibling pairs reported their children's sibling relationships and social adjustment. This study showed that the effects of sibling relationships on the prosocial behaviors and conduct problems of each child are stronger for twins than for singleton siblings. Moreover, positivity toward one's sibling increased peer problems only among monozygotic twins. The opposite tendency was present among dizygotic twins and singleton siblings. This study suggests the importance for children's social development of having many interactions with siblings and establishing reciprocity in sibling relationships. Moreover, our results sug...

Personality and Individual Differences, 2007

Although there is a great deal of interest in the Behavioral Inhibition System (BIS) and Behavior... more Although there is a great deal of interest in the Behavioral Inhibition System (BIS) and Behavioral Activation System (BAS)—two temperaments formulated by Gray's reinforcement sensitivity theory—few studies have examined the genetic and environmental etiology ...

The Japanese Journal of Educational Psychology, 2009

The Proceedings of the Annual Convention of the Japanese Psychological Association, Sep 11, 2012

This study examined whether universality of the 5-factor model (FFM) of personality operationaliz... more This study examined whether universality of the 5-factor model (FFM) of personality operationalized by the Revised NEO Personality Inventory is due to genetic influences that are invariant across diverse nations. Factor analyses were conducted on matrices of phenotypic, genetic, and environmental corre-lations estimated in a sample of 1,209 monozygotic and 701 dizygotic twin pairs from Canada, Germany, and Japan. Five genetic and environmental factors were extracted for each sample. High congruence coefficients were observed when phenotypic, genetic, and environmental factors were compared in each sample as well as when each factor was compared across samples. These results suggest that the FFM has a solid biological basis and may represent a common heritage of the human species.

proposed that the Big Five personality traits showed a higher-order structure with 2 factors he l... more proposed that the Big Five personality traits showed a higher-order structure with 2 factors he labeled ␣ and ␤. These factors have been alternatively interpreted as heritable components of personality or as artifacts of evaluative bias. Using structural equation modeling, the authors reanalyzed data from a cross-national twin study and from American cross-observer studies and analyzed new multimethod data from a German twin study. In all analyses, artifact models outperformed substance models by root-mean-square error of approximation criteria, but models combining both artifact and substance were slightly better. These findings suggest that the search for the biological basis of personality traits may be more profitably focused on the 5 factors themselves and their specific facets, especially in monomethod studies.

Etiology of factor structure in the Kaufman Assessment Battery for Children Sub Title Author 藤澤, ... more Etiology of factor structure in the Kaufman Assessment Battery for Children Sub Title Author 藤澤, 啓子(Fujisawa, Keiko K.) 安藤, 寿康(Ando, Juko) Publisher Centre for Advanced Research on Logic and Sensibility The Global Centers of Excellence Program, Keio University Publication year 2012 Jtitle CARLS series of advanced study of logic and sensibility Vol.5, (2011. ) ,p.119126 Abstract Notes I. Study of Logic and Sensibility

Twin Research and Human Genetics, 2001

Journal of Affective Disorders, 2021

Psychological Medicine, 2019

Background The phenotypic and aetiological architecture of depression symptomatology has been mos... more Background The phenotypic and aetiological architecture of depression symptomatology has been mostly studied in Western samples. In this study, we conducted a genetically informed factor analysis to elucidate both the phenotypic and aetiological architectures of self-reported depression among a Japanese adult twin sample. Methods Depressive symptoms assessed by Zung's Self-rating Depression Scale were self-rated by 425 twin pairs (301 monozygotic and 124 dizygotic twin pairs) in a community sample in Japan. Results An exploratory factor analysis extracted three symptom domains representing cognitive, affective and somatic symptomatology. A confirmatory factor analysis demonstrated that a bi-factor solution fitted better than the alternative solutions, implying that depression may be defined as a combination of a single general construct and three factors specific to each of the three symptom domains. A multivariate genetic analysis with the bi-factor solution showed that the gen...

Journal of Personality and Social Psychology, 2018

Frontiers in psychology, 2015

Why does decision making differ among individuals? People sometimes make seemingly inconsistent d... more Why does decision making differ among individuals? People sometimes make seemingly inconsistent decisions with lower expected (monetary) utility even when objective information of probabilities and reward are provided. It is noteworthy, however, that a certain proportion of people do not provide anomalous responses, choosing the alternatives with higher expected utility, thus appearing to be more "rational." We investigated the genetic and environmental influences on these types of individual differences in decision making using a classical Allais problem task. Participants were 1,199 Japanese adult twins aged 20-47. Univariate genetic analysis revealed that approximately a third of the Allais problem response variance was explained by genetic factors and the rest by environmental factors unique to individuals and measurement error. The environmental factor shared between families did not contribute to the variance. Subsequent multivariate genetic analysis clarified that d...

Behavior Genetics

Working memory (WM) encompasses both short-term memory (storage) and executive functions that pla... more Working memory (WM) encompasses both short-term memory (storage) and executive functions that play an essential role in all forms of cognition. In this study, the genetic structure of storage and executive functions engaged in both a spatial and verbal WM span task is investigated using a twin sample. The sample consists of 143 monozygotic (MZ) and 93 dizygotic (DZ) Japanese twin pairs, ages 16 to 29 years. In 155 (87 MZ, 62 DZ) of these pairs, cognitive ability scores from the Kyodai Japanese IQ test are also obtained. The phenotypic relationship between WM and cognitive ability is confirmed (r = 0.26–0.44). Individual differences in WM storage and executive functions are found to be significantly influenced by genes, with heritability estimates all moderately high (43%–49%), and estimates for cognitive ability comparable to previous studies (65%). A large part of the genetic variance in storage and executive functions in both spatial and verbal modalities is due to a common geneti...

Twin Research and Human Genetics, 2005

The Japanese Journal of Personality, 2011

Twin Research and Human Genetics, 2013

The Keio Twin Research Center has conducted two longitudinal twin cohort projects and has collect... more The Keio Twin Research Center has conducted two longitudinal twin cohort projects and has collected three independent and anonymous twin data sets for studies of phenotypes related to psychological, socio-economic, and mental health factors. The Keio Twin Study has examined adolescent and adult cohorts, with a total of over 2,400 pairs of twins and their parents. DNA samples are available for approximately 600 of these twin pairs. The Tokyo Twin Cohort Project has followed a total of 1,600 twin pairs from infancy to early childhood. The large-scale cross-sectional twin study (CROSS) has collected data from over 4,000 twin pairs, from 3 to 26 years of age, and from two high school twin cohorts containing a total of 1,000 pairs of twins. These data sets of anonymous twin studies have mainly targeted academic performance, attitude, and social environment. The present article introduces the research designs and major findings of our center, such as genetic structures of cognitive abilit...

Twin Research and Human Genetics, 2012

This study examined the link between sibling relationships and children's social adjustment b... more This study examined the link between sibling relationships and children's social adjustment by comparing twin siblings and siblings with different ages (singleton siblings), and clarified the role of reciprocity in sibling relationships on children's social development. Mothers of 58 monozygotic twin pairs, 48 dizygotic twin pairs, and 86 singleton sibling pairs reported their children's sibling relationships and social adjustment. This study showed that the effects of sibling relationships on the prosocial behaviors and conduct problems of each child are stronger for twins than for singleton siblings. Moreover, positivity toward one's sibling increased peer problems only among monozygotic twins. The opposite tendency was present among dizygotic twins and singleton siblings. This study suggests the importance for children's social development of having many interactions with siblings and establishing reciprocity in sibling relationships. Moreover, our results sug...

Personality and Individual Differences, 2007

Although there is a great deal of interest in the Behavioral Inhibition System (BIS) and Behavior... more Although there is a great deal of interest in the Behavioral Inhibition System (BIS) and Behavioral Activation System (BAS)—two temperaments formulated by Gray's reinforcement sensitivity theory—few studies have examined the genetic and environmental etiology ...

The Japanese Journal of Educational Psychology, 2009