It also depends on the level of "usage" of the student as an experimental animal. If it involves any experiment in the physical body Not only is unethical but also in some countries is a felony. There are some crimes against medical treatment that did not request informed consent. In any case due to the principles of bioethics, one should always consider other people as equals (is the least one can do) and request informed consent. But like I said, it depends on the level of the "usage" of the student as an experimental animal. If is only about asking some questions, that is part of the process of education that I teacher can do without asking for a written consent. But if it involves touching the body or experimenting with drugs or precedures, is necessary to ask for the written informed consent. Good luck!

When I experiment with different teaching techniques in a class in order to determine which approach is most effective with a particular group of students, I don't think I need their permission. In fact, letting them in on what I am trying to do would probably undermine the process.

It also depends on the level of "usage" of the student as an experimental animal. If it involves any experiment in the physical body Not only is unethical but also in some countries is a felony. There are some crimes against medical treatment that did not request informed consent. In any case due to the principles of bioethics, one should always consider other people as equals (is the least one can do) and request informed consent. But like I said, it depends on the level of the "usage" of the student as an experimental animal. If is only about asking some questions, that is part of the process of education that I teacher can do without asking for a written consent. But if it involves touching the body or experimenting with drugs or precedures, is necessary to ask for the written informed consent. Good luck!