As above; the others don't exclude subjects, although they may have preferred or required subjects.
Daguerreotypes required subjects that remained still, and there is no subject more patient than the dead.
Latin literature, Latin composition, and Greek literature were required subjects of study.
The study, conducted by University of Minnesota researchers during Tuesday night's Republican debate, required subjects to be connected to electrodes to measure their tolerance for the senator.
The early photographic equipment of the day required subjects to sit still for uncomfortably long times, which tended to produce, as Mr. Williamson put it, a glazed-over effect.
He's leaning on a pillar; back then, the technology required subjects to stand still for an hour to get the proper exposure, and pillars provided assistance.
A few tales stand out, like the Ming Dynasty emperor who required subjects to include crickets as part of their annual tax burden.
The test required subjects to indicate a corresponding Japanese character to that spoken by the examiner.
The DT task required subjects to generate "uses" for conventional and ambiguous objects.
The second study required subjects to keep daily records of their health and mood for 2 weeks.
The strict grading standard was fully automated and required subjects to type the exact name of each item, as decided by the experimenter prior to the experiment.
