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Faculty of Education Education and clinical psychology |
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SAKAI Motohiro
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Degree 【 display / non-display 】
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教育学士 ( 1999.4 宮崎大学 )
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人間科学修士 ( 2001.3 早稲田大学 )
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博士（人間科学） ( 2005.3 早稲田大学 )
Research Areas 【 display / non-display 】
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Humanities & Social Sciences / Clinical psychology
Papers 【 display / non-display 】
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Functional assessment of hikikomori behaviors: Functional types and psycho-behavioral factors Reviewed
Nonaka S., Takeda T., Sakai M.
Journal of Behavior Therapy and Experimental Psychiatry 88 102038 2025.9
Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Behavior Therapy and Experimental Psychiatry
Hikikomori is a condition of prolonged social withdrawal (at least six months) characterized by not working or attending school, not socializing outside one's home, and staying at home on most days except for solitary outings. Currently, there are no adequate tools for the assessment of individual differences in hikikomori functions. This study involved the development of the Hikikomori Functional Assessment Scale (HFAS), which quantitatively assesses the perceived functions of hikikomori. Three data samples were collected at different time periods and included 490 participants with hikikomori and 251 without hikikomori. An item pool was analyzed resulting in 17 items and three factors: intrapersonal-positive (pursuing activities and self-stimulatory behaviors), intrapersonal-negative (alleviating discomfort), and social-negative (avoiding social interactions) reinforcement. The HFAS showed good internal consistency reliability, moderate-to-good test-retest reliability, acceptable construct validity, and good criterion-related validity. Furthermore, social-negative reinforcement correlated positively with measures of depressive symptoms and subjective social functioning impairment and negatively with adaptive behavior and quality of life. Intrapersonal-negative reinforcement was weakly correlated with most of the related scales, and intrapersonal-positive reinforcement showed no significant correlations. Future studies are needed to confirm the consistency of functional assessment results with those of the HFAS, using behavioral observations by researchers and clinicians, and follow the changes in hikikomori functioning longitudinally.
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Shunsuke Nonaka, Hiroaki Kubo, Tomoya Takeda, Motohiro Sakai
International Journal of Social Psychiatry 207640241310189 2025
Language：English Publishing type：Research paper (scientific journal) Publisher：SAGE Publications
Background:
Currently, paradoxical findings exist regarding the level of functioning in individuals with Hikikomori (prolonged social withdrawal).
Aims:
This systematic review aimed to clarify the functioning, disability, and health of individuals with Hikikomori and their families in comparison to those without Hikikomori.
Method:
Relevant studies were searched from April 22 to 25, 2022, using MEDLINE, PsycINFO, Scopus, and two Japanese databases. Functions were categorized into ‘body functions”; “structure”; and “activity and participation’, which were further classified into subcategories.
Results:
Of the 8,181 studies screened, 24 studies with 1,769 individuals with Hikikomori were included. Twelve, three, and four indicators from six studies on depression and anxiety, three on addiction, and two on thought problem symptoms, respectively, were higher in the Hikikomori group than in the comparison group, with at least moderate effect sizes. Three indicators from three studies on interpersonal relationships were worse in the Hikikomori group, with at least moderate effect sizes. The meta-analyses showed that internalizing symptoms, externalizing symptoms, and thought disorders were significantly higher in the Hikikomori group than those in the comparison group with moderate-to-high effect sizes. Contrastingly, communication/interpersonal interactions were significantly lower in the Hikikomori group than those in the comparison group. No significant differences were observed in daily life/social life and the families’ communication/interpersonal interactions and relationship.
Conclusions:
The study limitations include a high risk of bias and heterogeneity. Overall, individuals with Hikikomori often have impaired mental and interpersonal interaction functions; thus, comorbidities of this condition should be carefully assessed. PROSPERO: CRD42022320592.DOI： 10.1177/00207640241310189
Other Link： https://journals.sagepub.com/doi/full-xml/10.1177/00207640241310189
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Development of a questionnaire for evaluating supporters’ skills in Hikikomori support Reviewed
Kubo H., Naono-Nagatomo K., Sakai M., Nonaka S., Funahashi H., Ishida Y., Hirano Y.
Current Psychology 2025
Publishing type：Research paper (scientific journal) Publisher：Current Psychology
Enhancing the skills of hikikomori supporters inherently contributes to improving the quality of support provided. However, a comprehensive skills assessment tool for these supporters has not yet been developed. This study aimed to develop a self-rated questionnaire, the Hikikomori Supporter’s Skills Checklist (HSSC). Based on a preliminary survey involving 43 supporters, the HSSC draft was revised. The revised version comprises 39 items addressing various aspects of consultation support. In the main survey, questionnaires were posted to 118 hikikomori community support centers. To assess convergent and discriminant validity and derive clinical insights, respondents completed the HSSC along with measures of stigmatic attitudes toward hikikomori and psychiatric patients, workplace psychological flexibility, burnout, and demographics, including prior experience in hikikomori-related learning and support. Analysis of 238 valid responses revealed a single-factor structure; however, 12 items were removed due to lower item factor loadings. The refined 27-item HSSC demonstrated acceptable internal consistency (Cronbach’s α = 0.74). HSSC scores showed a significant correlation with the number of training sessions undertaken (ρ = 0.24), along with other theoretically consistent but statistically non-significant correlations, supporting the checklist’s validity. Furthermore, in the comparison involving specific questions with relatively low correct response rate, a linear increase in the total HSSC score was observed across the low-, middle-, and high correct response rate groups. However, score distribution deviated from normality due to limited data from lower-scoring participants, restricting parametric analysis. Although further validation is necessary, the HSSC appears valuable for promoting self-reflection among hikikomori supporters and evaluating training outcomes.
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Sakai M., Yoshinaga N., Thew G.R., Clark D.M.
Frontiers in Psychiatry 15 1368722 2024.5
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Frontiers in Psychiatry
Hikikomori (prolonged social withdrawal) has been discussed as a hidden worldwide epidemic and a significant social and healthcare issue. Social anxiety disorder is the most common psychiatric disorder preceding the onset of Hikikomori. Although studies exist suggesting the effectiveness of family-support interventions, little is known about psychotherapeutic approaches for Hikikomori individuals. Here, we present a case of Hikikomori wherein an internet-delivered cognitive therapy for social anxiety disorder (iCT-SAD) worked effectively in improving the client’s social anxiety symptoms and social interaction behaviors. This case study demonstrates the principle that evidence-based psychological interventions focusing on social anxiety can be effective for clients with Hikikomori. Furthermore, the online mode of treatment delivery, along with a variety of relevant modules, may facilitate clients’ engagement with treatment at home. The findings suggest that iCT-SAD might be a promising option for Hikikomori clients who have social anxiety problems, within the recommended stepped-intervention approach.
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小学校における学級崩壊 ─ 小学校教員への半構造化面接から ─
立元 真, 境 泉洋, 尾之上 高哉
宮崎大学教育学部紀要 ( 103 ) 102 - 113 2024.3
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
Books 【 display / non-display 】
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福祉心理学
古村, 健, 丹羽, 健太郎, 下山, 真衣, 陶, 貴行, 森本, 浩志, 境, 泉洋（ Role： Joint editor）
講談社サイエンティフィク 2024.5
Language：Japanese Book type：Textbook, survey, introduction
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臨床行動療法テキスト : 子どものための新世代の行動療法
園田, 順一, 前田, 直樹, 境, 泉洋（ Role： Edit）
金剛出版 2024.4
Language：Japanese Book type：Scholarly book
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発達障害と青年期のひきこもり
境 泉洋（ Role： Contributor , CRAFTを応用した発達障害がある（疑われる）ひきこもり青年への家族支援）
金子書房 2023.6
Language：Japanese Book type：Scholarly book
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オンラインを活用したひきこもり支援の在り方に関する調査報告書
境 泉洋、野中俊介、尾之上麗、前川由貴子、KHJ全国ひきこもり家族会連合会（ Role： Joint author）
KHJ全国ひきこもり家族会連合会 2023.3
Language：Japanese Book type：Report
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現代の臨床心理学５ 臨床心理学と心の健康
境 泉洋（ Role： Contributor , ひきこもりの社会的支援）
東京大学出版会 2023.3
Language：Japanese Book type：Scholarly book
MISC 【 display / non-display 】
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Sakai Motohiro
Waseda journal of human sciences 18 105 - 106 2005.3
Language：Japanese Publishing type：Rapid communication, short report, research note, etc. (scientific journal) Publisher：Waseda University
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Nonaka S., Kim J.Y., Kang R.N., Kim E.S., Kubo H., Takeda T., Kwak M.S., Kang M.G., Sakai M.
Asian Journal of Psychiatry 110 104570 2025.8
Language：English Publishing type：Rapid communication, short report, research note, etc. (scientific journal) Publisher：Asian Journal of Psychiatry
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ひきこもりから社会参加までをシームレスにつなぐ心理支援 Invited
境 泉洋
医学のあゆみ 293 ( 2 ) 2025.4
Authorship：Lead author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)
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ひとりで悩まないで誰かに話をしてみませんか Invited
境 泉洋
広報くしま ( 2025年1月号 ) 24 - 24 2025.1
Authorship：Lead author Language：Japanese
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ひきこもりを新たな人生の準備期間にするために
境 泉洋
市広報みやざき ( 974 ) 8 - 8 2024.12
Authorship：Lead author Language：Japanese
Presentations 【 display / non-display 】
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医療と他領域の連携、協働について考えよう-福祉編-
境 泉洋, 巣黒 慎太郎, 東 健太郎, 澤田 梢, 金澤 潤一郎, 高橋 史
公認心理師の会 2024 年度 年次総会・研修会 2025.5.2
Event date： 2025.5.11 - 2025.5.12
Language：Japanese Presentation type：Oral presentation (general)
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ひきこもりについて様々な視点から考える～当事者、支援者、支援者支援～ Invited
境 泉洋，佐藤まゆみ，菊池まゆみ，福井里江
第４回日本公認心理師学会学術集会千葉大会 2024.12.15
Event date： 2024.12.15
Language：Japanese Presentation type：Symposium, workshop panel (nominated)
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福祉分野における行動科学的支援の導入にむけて
福留 尚典, 西中 宏吏, 辻田 真凜, 黒田 翔子, 境 泉洋, 石川 律，嶋田 洋徳
日本健康心理学会大会発表論文集 2024.11.24 一般社団法人 日本健康心理学会
Event date： 2024.11.23 - 2024.11.24
Language：Japanese Presentation type：Symposium, workshop panel (public)
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認知行動療法の社会実装に向けて
戸ヶ﨑 泰子，土井 理美，岡島 義，境 泉洋，日下 菜穂子，栗田 駿一郎
日本認知行動療法学会第50回大会 2024.9.24
Event date： 2024.9.22 - 2024.9.24
Language：Japanese Presentation type：Symposium, workshop panel (nominated)
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ケーススタディ座長「アルコール問題を抱えるひきこもり状態の女性に対するオンライン認知行動療法 ―標的行動の選択に迷うケースの対応―」
料崎 智秀，境 泉洋
日本認知行動療法学会第50回大会 2024.9.24
Event date： 2024.9.22 - 2024.9.24
Language：Japanese
Awards 【 display / non-display 】
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本明賞
2018 日本健康心理学会
野中俊介・嶋田洋徳・境 泉洋
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内山記念賞
2016.10 日本認知・行動療法学会
境 泉洋
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徳島大学共通教育賞
2015.8 徳島大学
境 泉洋
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康楽賞
2015.1 公益財団法人康楽会
境 泉洋
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学会奨励賞
2014.3 日本カウンセリング学会
境 泉洋
Grant-in-Aid for Scientific Research 【 display / non-display 】
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ひきこもり支援のためのコミュニティワイド認知行動療法（CWCBT-H）の開発
Grant number：23K20772 2024.04 - 2026.03
独立行政法人日本学術振興会 科学研究費基金 基盤研究(B)
Authorship：Principal investigator
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ひきこもり生物心理社会的病態理解に基づく多元的な支援法開発
Grant number：22H00494 2022.04 - 2026.03
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(A)
Authorship：Coinvestigator(s)
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iCT-SADを統合した「ひきこもり支援のためのコミュニティワイド認知行動療法」の開発
Grant number：22KK0192 2022.04 - 2026.03
独立行政法人日本学術振興会 科学研究費基金 国際共同研究加速基金(国際共同研究強化(A))
Authorship：Principal investigator
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ひきこもり支援のためのコミュニティワイド認知行動療法（CWCBT-H）の開発
Grant number：21H00951 2021.04 - 2026.03
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(B)
Authorship：Principal investigator
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思春期からの社会経験が剥奪されたひきこもり経験者の主体価値が人生に与える影響
Grant number：19H04882 2019 - 2021
科学研究費補助金 新学術領域研究
Authorship：Principal investigator