Professor fisher observes a group of participants over a period of 10 years to chart changes in memory. what kind of research is this?

It is a placed or running longitudinally round something. Though it relates to the length in the dimension of an object or the length of a place. It also includes the repeated measurement or analysis of a set of titles over time with regard to one or numerous research variables.

just don't strip down in public lol

answer; cultural trait;