By Matt Harrington, BCBA · Behaviorist Book Club · April 2026 · 12 min read

Autoclitics and Persuasive Verbal Stimuli: 18 Years of Research on Verbal Operant Functions

Overview & Clinical Significance

Research on verbal operants from the Laboratory of Verbal Operants Studies (LEOV) presents an eighteen-year empirical program examining a dimension of verbal behavior that clinical ABA has historically underemphasized: the autoclitic as a persuasive antecedent condition. Rather than studying autoclitics purely as grammatical qualifiers of speaker output, this research investigates how autoclitic verbal stimuli presented as antecedents alter the probability of subsequent nonverbal responses in listeners. This distinction — autoclitics as outputs versus autoclitics as inputs that exert stimulus control — has significant implications for understanding how verbal behavior shapes behavior in social and clinical contexts.

For BCBAs, the relevance is both theoretical and applied. Theoretically, this line of research extends Skinner's framework by examining how verbal stimuli presented in particular autoclitic frames alter the function of accompanying verbal content — essentially, how language modifies listener behavior not just through its semantic content but through the relational and qualifying context in which that content is embedded. Applied, this has implications for how practitioners frame instructions, prompts, and clinical recommendations.

The empirical base — eleven experiments conducted across two populations (typically developing children and university students) using A-B-A and pre-post designs — provides a data-rich foundation for understanding autoclitic effects that goes beyond the conceptual analysis in Skinner's original framework. BCBAs who engage with this research develop a more nuanced understanding of how verbal stimuli in their own clinical language may be functioning as motivating operations or discriminative stimuli for client, caregiver, and supervisee behavior.

Data collection and measurement procedures are central to this research program, and the methods used — systematic behavioral observation, controlled baseline conditions, and replication across studies — demonstrate the kind of rigorous behavioral science that practitioners should apply to evaluating research claims in the broader ABA literature.

Background & Context

The autoclitic is among the least studied of Skinner's verbal operant categories in applied behavior analysis. Skinner defined autoclitics as verbal behavior that depends on and qualifies other verbal behavior — they include grammatical elements, relational terms, and phrases that indicate the speaker's degree of certainty, the logical relationship between propositions, or the evaluative status of what is being said. Examples include quantifiers ("some," "all," "no"), relational terms ("therefore," "however," "except"), and epistemic markers ("I know," "I think," "it seems").

Most clinical applications of Skinner's framework focus on primary verbal operants — mands, tacts, echoics, intraverbals — because these are the operant classes most obviously impaired in individuals with developmental disabilities. Autoclitic development has received less systematic attention in the intervention literature, in part because it requires more complex verbal repertoires as a foundation and in part because measuring autoclitic behavior is more technically demanding than measuring simpler verbal operant classes.

The LEOV research program led by Prof. Hubner takes a different approach to autoclitics — examining them not primarily as components of speaker output to be taught but as stimulus conditions that alter the probability of listener behavior. This shift from a production to a reception perspective opens new empirical territory. If autoclitic frames modulate listener behavior — if presenting a proposition in an "it is known that..." frame versus an "it is possible that..." frame changes the probability of compliance or subsequent verbal behavior — this has practical implications for instruction, clinical communication, and behavior change.

The populations studied — typically developing children and young adults — provide a baseline of autoclitic function in verbal behavior that is not impaired. This baseline is valuable for understanding the target when developing autoclitic repertoires in clinical populations. Research with these populations also examines the stimulus control properties of autoclitic frames independent of other clinical variables, isolating the autoclitic effect in ways that would be more difficult in clinical populations with complex behavioral histories.

Clinical Implications

The most direct clinical implication of the LEOV research program is an expansion of how BCBAs think about verbal stimuli in the clinical environment. If autoclitic frames presented as antecedent verbal stimuli alter the function of accompanying content — making compliance more or less likely, strengthening or weakening the discriminative stimulus control of instructions — then the verbal behavior of practitioners and caregivers in clinical contexts is subject to systematic analysis in ways that are rarely attended to.

Consider instruction delivery: "Touch the red card" and "I'd like you to touch the red card" and "Touch the red card, please, because it will help you" are topographically different instructions with potentially different stimulus control functions. The autoclitic frames embedded in each version may alter the probability of compliance independently of the semantic content. Research on autoclitic effects provides an empirical framework for analyzing these differences.

For BCBAs developing language intervention programs, the findings have implications for how autoclitic training is sequenced. If autoclitic frames function as discriminative stimuli that modulate listener behavior even before the client has mastered expressive autoclitic use, then training listener-side autoclitic comprehension may be a prerequisite for more complex social communication goals. Clients who cannot parse relational and qualifying verbal stimuli are likely to miss important contextual information in naturally occurring verbal environments.

Data collection and measurement procedures emphasized in this research — systematic baseline collection, controlled comparisons, and replication across participants and conditions — are directly applicable to clinical single-case research. BCBAs conducting research within their practices can apply these design principles to questions about verbal behavior intervention effectiveness that are relevant to their specific client populations.

For supervisors, the persuasive properties of autoclitic verbal stimuli are relevant to how feedback is delivered. Supervisory statements framed with different autoclitic qualifiers ("I know this is difficult, but..." versus "I noticed that..." versus "The data show that...") may have systematically different effects on supervisee behavior that deserve empirical attention.

Ethical Considerations

Code 2.01 on competence is relevant to applying research on autoclitic effects in clinical contexts. The LEOV research involves controlled laboratory conditions and specific experimental procedures; practitioners who attempt to apply findings about autoclitic persuasive effects to clinical communication without understanding the conditions under which those effects were obtained risk misapplication. As with any research, the boundary between empirically supported application and clinical extrapolation beyond the data requires careful navigation.

Code 2.09 on evidence-based practice directly engages with the importance of evaluating research quality before applying findings. The A-B-A and pre-post designs used in the LEOV program are standard in behavior analysis, and replication across eleven experiments provides reasonable confidence in the reliability of findings. BCBAs should evaluate the methodology of each study rather than accepting bundle-level claims about research support.

The persuasive dimension of autoclitics raises an ethical question about influence in clinical communication. If autoclitic frames systematically alter the probability of listener behavior, and if BCBAs understand this mechanism, there is an implicit obligation to use this knowledge in ways that serve client and family interests rather than practitioner convenience. Code 2.14 on client dignity is relevant here: verbal influence techniques that manipulate rather than inform or genuinely persuade are inconsistent with treating clients as autonomous participants in their own care.

Code 1.01 on truthfulness applies to how practitioners represent research findings to families, teams, and other professionals. The LEOV research on autoclitic persuasive effects is specialized and nuanced; representing it accurately — as a research program with specific findings under specific conditions, rather than as a general principle about how all verbal communication works — is an honesty obligation.

For supervisors, the implications of autoclitic research for supervisory communication create an obligation to be thoughtful about verbal influence in supervision relationships. Supervisory authority can magnify the effects of verbal framing; supervisors should be aware that how they say something may be as functionally important as what they say.

Assessment & Decision-Making

The LEOV research program uses A-B-A and pre-post designs, which are the standard tools of behavioral research for demonstrating functional relationships between independent and dependent variables. For BCBAs evaluating this research, understanding these design features is prerequisite to interpreting the findings. A-B-A designs provide within-subject demonstrations of the effect of the autoclitic variable on nonverbal responding; pre-post designs evaluate change across a training or exposure condition. Neither design alone provides all the information a practitioner needs for confident clinical application, but together across eleven experiments, they provide a substantial evidence base.

Assessment of autoclitic repertoires in clinical populations requires attention to both expressive and receptive dimensions. On the expressive side, does the client use autoclitic elements to qualify, relate, or modify their own verbal behavior? On the receptive side, does the client's behavior change systematically when autoclitic frames are varied in the verbal stimuli they encounter? These assessments require more nuanced probing than standard verbal behavior assessments typically address.

Decision-making about whether to target autoclitic skills in intervention should be driven by the client's current verbal repertoire and the functional demands of their environment. For clients with strong foundational verbal operants who are working on complex social communication, conversational reciprocity, and academic language use, autoclitic training may be an appropriate next priority. For clients still developing basic mand, tact, and intraverbal repertoires, autoclitic training is unlikely to be the priority.

For researchers in practice settings, the LEOV program's methodology provides a template for small-scale single-case research on verbal behavior that can be conducted within clinical constraints. Systematic observation of verbal stimulus effects on listener behavior, with baseline and comparison conditions, can be arranged within existing programming without disrupting clinical goals.

What This Means for Your Practice

For BCBAs, the practical takeaway from this eighteen-year research program is an invitation to pay closer attention to the verbal stimuli in their clinical environments — not just the topographic content of what is said but the relational and qualifying frames in which content is embedded. If autoclitic frames alter the function of verbal stimuli for listeners, then how instructions, prompts, and feedback are verbally framed in clinical and supervisory contexts is a variable that deserves attention.

For supervisors developing supervisee communication skills, the autoclitic research provides a conceptual framework for analyzing verbal influence that goes beyond simple assertiveness or clarity advice. Understanding that certain verbal frames may reliably alter the probability of supervisee behavior — increasing engagement, reducing defensive responding, or clarifying the behavioral expectation — gives supervisors a behavior analytic lens for their own communication practice.

For practitioners developing language programs, the distinction between autoclitics as production targets and autoclitics as antecedent conditions creates two complementary intervention directions. Teaching clients to produce autoclitic elements is one goal; ensuring clients have the receptive repertoire to respond appropriately to autoclitic frames in naturalistic verbal environments is another. Both are clinically meaningful but require different assessment and intervention approaches.

For BCBAs interested in behavioral research, the LEOV program demonstrates the continued fertility of the verbal operant framework as a basis for systematic empirical investigation. Questions about how verbal stimuli function as antecedent conditions — not just consequences — represent an underexplored dimension of verbal behavior research with substantial practical implications. Practitioners who engage with this literature are participating in an active research program, not merely reviewing settled science.