What term describes the condition of an experiment in which the intervention has not yet been introduced?

The term that describes the condition of an experiment in which the intervention has not yet been introduced is "baseline." In the context of behavioral analysis, baseline refers to the initial data collected before any intervention is applied. This phase is crucial because it establishes a reference point against which the effects of the intervention can be measured. By recording the behavior or response patterns during this period, practitioners can determine whether any changes observed after the intervention are due to the treatment itself or simply a continuation of existing trends.

In contrast, a functional behavioral assessment is a systematic process for identifying the underlying causes of specific behaviors, while a stimulus preference assessment aims to determine which stimuli are most preferred by the individual, potentially guiding the selection of reinforcers. A behavioral assessment encompasses a broader range of evaluations to understand and quantify behaviors but does not specifically refer to the condition before an intervention, as the term "baseline" does. Thus, baseline is the most accurate term for the condition described in the question.