Others feel that Freud used too few subjects to test his theories.

Rather, they must be measured through extensive tests using human subjects in laboratory settings.

Functional imaging studies have been performed mainly using human subjects.

One other note - there are usually rules for using human subjects in experiments, so be sure to ask your teacher or principle about them!

Information can be found using subjects or a search function.

The photographs had been previously used in studies using subjects from Western cultures.

The unusually generous funding available at the institute allowed him to use human subjects for the first time.

Talks are given by members of staff, often illustrated or using live subjects.

He would scarcely dare, use human subjects until much more progress has been made.

The new study avoided these issues, largely by using human subjects.