Probe Trial Analysis

Probe trial analysis separates responding under reduced teaching support from performance that depends on training arrangements. The target stimulus and response opportunity are presented without the prompts, cues, or reinforcement used during instruction. Comparing accuracy and errors with training or baseline performance helps determine whether the learner can perform the response independently rather than only when direct support is available.

Each measure describes a different aspect of responding. Accuracy shows whether the target response occurred correctly, latency indicates how quickly it occurred, and errors identify unsuccessful responses. Independence captures performance without arranged teaching support. Examining these measures together gives a more detailed view of skill acquisition and can reveal progress that a single outcome measure might not show.

Probe results can show whether behavior is controlled by the intended stimulus rather than by prompts or other features of training. Presenting the target response opportunity under specified test conditions also permits comparison across stimuli or settings. Differences in performance may reveal limited generalization, while similar responding across conditions supports broader transfer of the learned skill.

First, specify the target stimulus, response opportunity, and test conditions. Next, present the opportunity without the prompts, cues, or reinforcement arranged during training. Record relevant outcomes, such as accuracy, latency, errors, and independence. Finally, compare the probe data with training or baseline performance to evaluate acquisition, retention, generalization, or stimulus control.

The procedure should identify the stimulus presented, the response opportunity, and the conditions under which testing will occur. It should also establish which outcomes will be recorded, including accuracy, latency, errors, and independence. Clear specification makes comparisons with training or baseline performance more interpretable and helps distinguish changes in the skill from changes in testing conditions.

In applied behavior analysis, probe data can guide instructional decisions when practitioners need to determine whether a skill persists after direct teaching support is reduced. The results may reveal gaps in learning, limited generalization, or insufficient retention. These findings help indicate whether instruction should continue, change, or be evaluated across additional stimuli or settings.