Ensures that pre-experimental differences between experimental conditions are “neutralized” or distributed evenly.

Designed to reduce the impact of reactive measurement due to the experimenter.

In an experiment, the validation of the operational definition of the independent variable.

Because the laboratory situation was an uncommon experience for subjects in the epileptic seizure experiment, the study was low in ________.

The epileptic seizure study was high in ________ because the experiment engaged subjects and had an impact on them.

May be strengthened through replication.

This procedure is intended to reduce participants’ preoccupation with the true purpose of the experiment.

A major strength of experiments.

A true experiment that is conducted in a natural setting.

Aspects of an experiment that communicate unintentional cues to subjects about how they ought to act.

At this stage, participants may be questioned directly about their experience during the experiment.