The concepts of the "Sister Complex" ( Siscon ) and "Brother Complex" ( Brocon ) are heavily utilized tropes in Japanese media. They explore extreme attachment or hyper-fixation between family members.

In Japanese culture, siblings are addressed based on their relative age and the level of formality required.

In the future, we can expect to see more sophisticated and culturally sensitive studies that build upon the foundations laid by the Spikespen Test. These studies will not only enhance our understanding of human psychology but also highlight the importance of cultural considerations in shaping our behaviors and decisions. As we continue to navigate an increasingly interconnected world, such insights will be invaluable in fostering greater understanding and cooperation across cultural boundaries.