- Applied Behavior Analysis Antecedent-Based Interventions Questions and Answers Flashcards

A behavior analyst is designing an antecedent-based intervention for a student who engages in escape-maintained problem behavior during math worksheets. After a functional analysis, the team decides to implement high-probability (high-p) request sequences. Which outcome would MOST accurately indicate that the high-p sequence is functioning as intended?

Answer: Behavioral momentum carries over such that compliance with the low-p request increases and problem behavior decreases, even when the high-p sequence is later thinned

High-p request sequences work by establishing a behavioral momentum: repeated reinforcement of simple, well-established responses increases the probability of compliance with the more challenging low-p request. A successful intervention shows reduced problem behavior during the low-p demand AND generalization as the sequence is thinned — not just speed of task completion. Persistence of reduced problem behavior during thinning indicates the procedure has altered the motivating operations and stimulus control surrounding the demand context.

During a non-contingent reinforcement (NCR) intervention for attention-maintained stereotypy, a BCBA notices that the target behavior initially decreases but then rebounds to near-baseline levels after two weeks, despite no changes to the schedule. Which mechanism BEST explains this resurgence?

Answer: The fixed-time schedule of NCR may have become a discriminative stimulus signaling when attention will NOT be delivered, increasing behavior in the intervals

When a fixed-time (FT) NCR schedule is used, the predictable delivery of attention can inadvertently function as an S-delta during inter-reinforcement intervals — the learner discriminates when attention is not forthcoming and increases the target behavior to recruit it. This is a well-documented limitation of FT vs. variable-time (VT) schedules in NCR. A VT schedule is typically recommended to prevent this discriminative stimulus effect. The other options mischaracterize the mechanisms involved in NCR.

A BCBA is treating severe self-injurious behavior (SIB) that a functional analysis confirms is automatically reinforced (sensory). The team implements a competing stimulus assessment and identifies several items that suppress SIB. However, when these items are embedded into the daily routine as antecedent-based interventions, SIB suppression is inconsistent across environments. Which analysis is MOST critical before modifying the intervention?

Answer: A stimulus control analysis to determine whether the competing stimuli are functioning as motivating operations that abolish the automatic reinforcement, or merely as distractors

For automatically reinforced behavior, the critical distinction is whether a competing stimulus functions as an abolishing operation (AO) — reducing the reinforcing value of the sensory consequence produced by SIB — or merely as a distractor that occupies the hands/mouth temporarily without altering the motivating operation. If items function only as distractors, they will fail in environments where engagement with them is lower. Conducting a stimulus control analysis (examining whether the items abolish the MO or simply occupy behavior) is the most clinically precise next step before redesigning the intervention.

A behavior analyst is conducting an antecedent analysis for a learner whose aggression is maintained by tangible access. The team implements a choice-making intervention, offering the learner options throughout the day. After six weeks, data show that aggression has not decreased and has actually increased slightly during transition times. What is the MOST likely explanation for the failure of the intervention?

Answer: Transitions represent a distinct antecedent class not targeted by the choice-making procedure, and the relevant motivating operation during transitions remains unaddressed

Choice-making interventions modify antecedent control within the activity or demand context in which choices are embedded. Transition periods represent a separate antecedent class — a different situation with its own motivating operations (e.g., loss of access to a preferred item, uncertainty about what comes next). If the intervention was not designed to address transitions specifically, the relevant MO (abrupt loss of tangible access) during that time remains intact and unaddressed, explaining why aggression is elevated precisely at transitions. The intervention needs to be extended or augmented with transition-specific antecedent strategies.

In a study comparing antecedent exercise as an intervention for stereotypy, a BCBA notes that the suppressive effects of a 20-minute aerobic exercise bout are most pronounced in the 30–60 minutes post-exercise but dissipate by 90 minutes. The BCBA wants to use this data to inform schedule of implementation. According to the motivating operations framework, which explanation BEST accounts for the time-limited suppression of automatically reinforced stereotypy following exercise?

Answer: Aerobic exercise functions as an abolishing operation by altering the neurochemical substrates that mediate the sensory reinforcement produced by stereotypy, with effects that are time-limited by physiological recovery

Within the MO framework, exercise is theorized to function as an abolishing operation (AO) for the automatic sensory reinforcement maintaining stereotypy — likely via neurobiological mechanisms (e.g., increased dopamine, endorphin modulation) that temporarily reduce the reinforcing value of the sensory stimulation produced by the stereotypy. This is consistent with the time-limited pattern: as these neurochemical effects dissipate over roughly 60–90 minutes, the AO effect wanes and the value of the sensory reinforcer is restored, allowing stereotypy to recover. This distinguishes the MO explanation from a simpler fatigue account or SD account.

A BCBA is designing an antecedent-based package for elopement maintained by escape from group instruction in an elementary school setting. The team implements a modified instructional format with task interspersal and errorless learning. Three months later, the teacher reports that elopement has nearly disappeared during structured 1:1 instruction but persists at elevated rates during whole-group instruction despite identical curriculum modifications. Which antecedent variable MOST likely accounts for the differential outcomes?

Answer: The group instructional format contains additional discriminative stimuli — such as peer proximity, noise level, or diffuse teacher attention — that function as establishing operations for escape behavior independent of the task demands

Whole-group instruction involves a constellation of antecedent variables beyond task difficulty — including unpredictable teacher attention, peer noise and movement, longer wait times, and reduced individualized feedback — each of which can function as an establishing operation that elevates the aversive quality of the instructional context independently of the curricular modifications. The fact that 1:1 instruction was successfully addressed demonstrates that task-level modifications are working; the persistent elopement in group settings implicates these additional contextual antecedents that were not modified. A comprehensive antecedent analysis of the group setting is the appropriate next step.