antecedent-interventions

name	antecedent-interventions
description	Use when designing proactive strategies to prevent problem behavior by modifying environmental events that precede behavior, including NCR, high-p sequences, visual supports, and demand fading.

Antecedent Interventions

Antecedent interventions modify conditions that occur before behavior to prevent problem behavior from occurring and to increase the likelihood of appropriate behavior. These are proactive, prevention-focused strategies selected based on the function of the target behavior.

Core Principle

Antecedent interventions work by either abolishing the establishing operation (EO) for problem behavior, evoking alternative appropriate behavior, or both. They do not require the problem behavior to occur first—making them less intrusive and more acceptable to caregivers and clients.

Noncontingent Reinforcement (NCR)

NCR delivers the functional reinforcer on a fixed-time schedule independent of behavior.

Procedure

1. Identify the function of the problem behavior via functional analysis or descriptive assessment.
2. Deliver the functional reinforcer on a dense time-based schedule (e.g., FT 30s) regardless of what the client is doing.
3. Gradually thin the schedule as problem behavior decreases (e.g., FT 30s → FT 1min → FT 2min → FT 5min).
4. Monitor for schedule thinning failures—if problem behavior increases, return to the previous denser schedule.

Function-Based Application

• Attention-maintained: Deliver attention on a time-based schedule (check-ins, praise, conversation).
• Escape-maintained: Provide scheduled breaks before the client requests them or engages in problem behavior.
• Tangible-maintained: Provide access to preferred items on a time-based schedule.

Key Considerations

• NCR initially eliminates the contingency between behavior and reinforcer, reducing the EO.
• Over time, NCR can be combined with differential reinforcement to re-establish appropriate contingencies.
• Risk: reinforcement of whatever behavior coincidentally occurs at the delivery moment (adventitious reinforcement). Mitigate by ensuring the client is not engaging in problem behavior at the moment of delivery when possible.

High-Probability (High-p) Request Sequence

Deliver a rapid series of easy, high-compliance requests (high-p) immediately before a low-compliance request (low-p) to build behavioral momentum.

Procedure

1. Identify 3–5 requests with a history of high compliance (>80%).
2. Deliver high-p requests rapidly with brief inter-instruction intervals (<5 seconds).
3. Provide brief praise or reinforcement after each high-p compliance.
4. Deliver the low-p request immediately after the last high-p compliance—do not pause.
5. Reinforce compliance with the low-p request robustly.

When to Use

• Escape-maintained noncompliance.
• Transitional refusal (e.g., stopping a preferred activity to begin a non-preferred one).
• Situations where demand fading is impractical.

Environmental Arrangement

Modify the physical or social environment to reduce the likelihood of problem behavior.

• Remove or reduce access to stimuli associated with problem behavior.
• Increase access to stimuli associated with appropriate behavior.
• Adjust physical layout: reduce crowding, create defined activity areas, minimize distractions.
• Modify task materials: simplify, add visual cues, provide choice among materials.
• Adjust staffing ratios during high-risk times.

Choice Making

Provide the client with choices among tasks, materials, sequences, or reinforcers.

• Offering choices can reduce escape-maintained behavior by increasing perceived control.
• Choices should be genuine: the client must be willing to accept either option.
• Embed choices within instructional routines: "Do you want to work on math or reading first?"
• Choice making does not mean the client can choose to do nothing—the available options all involve engagement.

Visual Supports and Schedules

Visual supports make environmental expectations predictable and reduce anxiety-driven behavior.

• Activity schedules: Sequence of pictures or text showing the order of activities. Particularly effective for transitions.
• First-Then boards: Pair a non-preferred activity with a subsequent preferred activity.
• Token boards: Visual display of tokens earned toward a backup reinforcer.
• Social narratives/stories: Describe expected behavior in specific situations.
• Timers: Visual countdown indicating when an activity or wait period will end.

Demand Fading

Systematically increase task demands from a low baseline to target levels.

Procedure

1. Begin with demand levels at which the client demonstrates zero or near-zero problem behavior.
2. Gradually increase: number of tasks, difficulty, duration, or a combination.
3. Pair demand increases with reinforcement for compliance.
4. Use data to guide the pace of fading—increase demands only when the client is stable at the current level.

When to Use

• Escape-maintained behavior when the client has a history of successful avoidance.
• Re-introducing demands after a period of no demands (e.g., returning from break, new setting).

Task Modification

Alter the task itself to reduce its aversive properties while maintaining the instructional target.

• Reduce response effort (e.g., typing instead of writing).
• Intersperse easy tasks with difficult ones (interspersal technique).
• Shorten task duration.
• Provide response accommodations that maintain the learning objective.

Priming

Expose the client to upcoming stimuli or expectations before the actual demand.

• Preview the day's schedule each morning.
• Provide advance notice of transitions: "In 2 minutes we will clean up."
• Pre-teach new skills before they are needed in context.
• Use video priming to show what an upcoming event will look like (e.g., a field trip, a new classroom).

Selecting Antecedent Interventions by Function

Function	Primary Antecedent Strategies
Attention	NCR (attention), visual schedules, environmental enrichment
Escape	Demand fading, task modification, choice making, high-p sequence, visual schedules
Tangible	NCR (tangible access), visual schedules, choice making
Automatic	Environmental enrichment, matched stimulation, NCR (competing items)

Implementation Checklist

1. Confirm the function of the behavior through assessment data before selecting antecedent strategies.
2. Select strategies that directly address the identified function.
3. Train all implementers (staff, caregivers) to fluency using behavioral skills training.
4. Collect data on both the antecedent strategy implementation (fidelity) and the target behavior.
5. Make data-based decisions about fading, modifying, or intensifying the intervention.

Key References

• Carr, J. E., Severtson, J. M., & Lepper, T. L. (2009). Noncontingent reinforcement is an empirically supported treatment for problem behavior exhibited by individuals with developmental disabilities. Research in Developmental Disabilities, 30, 44–57.
• Carr, E. G., et al. (2000). Comprehensive multisituational intervention for problem behavior in the community. JABA, 33, 559–578.
• Cooper, J. O., Heron, T. E., & Heward, W. L. (2020). Applied Behavior Analysis (3rd ed.). Pearson.
• Mace, F. C., et al. (1988). Behavioral momentum in the treatment of noncompliance. JABA, 21, 123–141.