Yasumasa Kosaka

Relationship between Intimacy and Styles of Sharing Among University Friends 

The Japanese journal of adlescent psychology, 24(2) 111-124, 2013  

Developing an aspect model of romantic relationships in adolescence 

Bulletin of Faculty of Human Studies, (4) 79-89, Mar, 2011  

Three Questions Linking Reality of Adolescents to Research : Comments on OKAJIMA's Article(Comments) 

The Japanese journal of adlescent psychology, 23(2) 211-215, 2011  

Further Progress of Studies on "Sharing" as New Viewpoint to Understand Friendship in Adolescents : A Reply to ENOMOTO's and OHTANI's Comments(Comments) 

The Japanese journal of adlescent psychology, 23(2) 193-197, 2011  

Clarification of Psychological Characteristics of the Adolescents not desiring a steady romantic relationship 

The Japanese journal of adlescent psychology, 23(2) 147-158, 2011  

A Reply to AMAYA's and NAKAMA's Comments on "Developmental Changes of Feeling Generated by Recognized Inferiority in Appearance in Adolescence"(Comments) 

The Japanese journal of adlescent psychology, 22 73-77, 2010  

Relationship between Shared Objects and Psychological Functions of Sharing Among Junior High School Friends 

The Japanese journal of adlescent psychology, 22 1-16, 2010  

Developing the determinant factor model of inferiority feelings in adolescence 

Tsukuba psychological research, (37) 77-86, 2009  

Developmental Changes in the Style of Reflecting and Feeling of Inferiority in Adolescence 

The Japanese journal of adlescent psychology, 21 83-94, 2009  

Developmental Changes of Feeling Generated by Recognized Inferiority in Appearance in Adolescence 

The Japanese journal of adlescent psychology, 20 41-53, 2009  

Developmental changes in inferiority feelings in adolescents and young adults : Important areas of the self 

JAPANESE JOURNAL OF EDUCATIONAL PSYCHOLOGY, 56(2) 218-229, Jun, 2008  

The relation between inferiority feeling and competitiveness in adolescence 

Tsukuba psychological research, (35) 41-48, 2008  

Psychological Jiritsu in Adolescence (IV) : Developmental Process of Psychological Jiritsu 

Journal of Hokkaido University of Education. Education, 57(1) 135-142, Aug, 2006  

Psychological Jiritsu in Adolescence(II) : Construction of Psychological Jiritsu Scale 

Journal of Hokkaido University of Education. Education, 56(2) 17-30, Feb, 2006  

The analysis of Jungian psychology of compromising with shadow in "Peach John" 

Tsukuba psychological research, (31) 59-64, 2006  

Psychological Jiritsu in Adolescence 3 : The Effects of Family Function on Psychological Jiritsu in Adolescence 

Journal of Hokkaido University of Education. Education, 55(2) 77-85, Feb 25, 2005  

The effect of metacognition using "balloon mdthod" in mathmatical learning 

Journal of Hokkaido University of Education. Education, 54(1) 13-23, Sep 30, 2003  

Psychological Independence in Adolescence(I) : Reconceptualization of psychological independence 

Bulletin of the Integrated Center for Educational Research and Training, Hokkaido University of Education, 4 135-144, Mar, 2003  

Positive-Illusion and Depression 

Bulletin of the Integrated Center for Educational Research and Training, Hokkaido University of Education, 4 127-134, Mar, 2003