My Interests

Humans are so diverse.
I study how human diversity emerges, with special attentions on environment, behavior, and culture.

I am particularly interested in the diversity of human fecundity. Fecundity refers to the biological ability to conceive. Whereas fertility is easily measured by the number of children born, fecundity cannot be directly measured. Thus time to pregnancy (TTP) is used to measure fecundity. TTP refers to the duration between discontinuing contraception and conception, and is believe to inversely associated with fecundity.

I have conducted a couple of studies on TTP and its correlates targeting Japanese couples.

In our new collaborative project “Interdisciplinary Investigation on Technology, Environment, and Fertility (IITEF)”, we study the environmental, behavioral, and cultural factors that are related to fecundity of Japanese men.