My current research topic is "universal design in language use," with special reference to order in language and thought. In particular, I am investigating (1) similarities and differences in neural processing of languages with different basic word orders, (2) to what extent the order in non-verbal thought is affected by the order in language, and vice versa, and (3) what is the optimal order in human language and human thought, if any.

Many studies have reported that subject-object (SO) word order, where the subject (S) precedes the object (O), tends to have lower processing costs and is preferred by native speakers compared to object-subject (OS) word order. However, traditional studies have primarily focused on SO languages, such as Japanese and English, where SO word order is the grammatical default. As a result, it remains unclear whether the preference for SO word order reflects the basic word order of individual languages or more universal cognitive characteristics of humans.

• To address this, we are conducting research on the cognitive processing of minority languages that use object-subject (OS) word order as their basic word order—specifically Kaqchikel and Truku, which have not been studied before. This research focuses on the relationship between “word order in language” and “order of thought.” The findings are then compared to the cognitive processing of Japanese and English.
• For this purpose, experimental equipment is brought to the speakers’ regions (Guatemala and Taiwan) to conduct a variety of investigations and experiments, including behavioral experiments, eye-tracking, and brain function measurements. Additionally, for experiments requiring large, non-portable equipment such as MRI scanners, the speakers are invited to Japan for the studies.

Although I am conducting basic research, I believe it helps develop (1) effective language teaching/learning methods, (2) rehabilitation programs for aphasia, (3) dynamic preservation of endangered languages/dialects, and so on.

To prevent loneliness and social isolation in middle-aged and older adults, this study aims to introduce the community-based initiative “Community Shed.” This initiative has been selected for the project-driven track of Tohoku University’s co-creation promotion project, “SOKAP-Connect Projects.” Community Sheds are originated in Australia, into Japan and to scientifically examine its effects. As the number of older adults living alone increases and more people lose a sense of purpose in life, Community Sheds are attracting attention as places that foster social connections and promote the formation of ikigai (a sense of meaning in life). This study is grounded in the theory of the “Social Cure,” which posits that group membership enhances health and well-being.

Conventional interventions have been effective in addressing objective indicators of social isolation but have shown only limited impact in alleviating subjective feelings of loneliness, and they have insufficiently addressed the social structures that generate isolation. In Japan in particular, the isolation of older men after retirement has become a serious issue, with few opportunities available for creating new purposes in life or for seeking consultation. Community Sheds aim not merely to provide opportunities for social interaction but to focus on the quality of social connections and the construction of social identity (a sense of belonging). They are designed to offer a space for autonomous and self-directed activities through which participants can cultivate both a sense of purpose and a sense of belonging.

• In collaboration with the Japan Community Shed Association and JST-RISTEX, pilot Community Sheds have been established in Japan, including “Yorou-ya” and “Dandan-ya” in Mizukami Village, Kumamoto Prefecture, and “Pokke-Kotan” in Nishi Ward, Sapporo City, where their effectiveness is being evaluated. The results so far indicate reductions in feelings of loneliness, improvements in perceived physical health and cognitive function, and an expansion of group memberships and supportive relationships. Building on these findings, this project aims to develop a sustainable, Japan-specific system to prevent unwanted isolation and loneliness.

In collaboration with companies, there is strong potential for joint demonstration projects and service development in areas such as corporate health management, community engagement, and the promotion of well-being. For example, applications may include second-career support programs for retired employees, initiatives to extend healthy life expectancy, and integration with community-based CSR activities. In this way, Community Sheds can be developed as a model that simultaneously addresses societal challenges and enhances corporate value.

• I investigate on the economics of aging, the optimal social welfare policy, low fertility and so on not based on the historical and systematic approach but based on the neo-classical economic theory. I also use econometric method and statistical approach. I often estimate the future projections of the population, public finance, magnitude of private markets, the results of public policies.
• I also research on the comparative studies on East Asia (Japan, China, Korea, Taiwan) and European (especially Scandinavian countries). I provide statistic data and information on the economic and political systems on the aging in Japan.

The future estimation on the financial status , market caused by low fertility and aging. The effective management of the medical institutions, social welfare systems, gender equality societies for the central and local government, research institutions, public enterprises, and financial Institutions.