ABA Glossary

By Dana Meller, M.A., BCBA
Edited by Tyra Sellers, J.D., Ph.D., BCBA-D
ABA Glossary by Dana Meller, M.A., BCBA, edited by Tyra Sellers, J.D., Ph.D., BCBA-D

Motivating operation (MO)

An environmental variable that alters the reinforcing or punishing effectiveness of a stimulus and alters the current frequency of all behavior that has been reinforced or punished by that stimulus.

5th Edition Task List

B-10  Define and provide examples of stimulus control.

6th Edition TCO

B.16 Identify examples of motivating operations.

Related Content

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    An effect of motivating operations that causes an in-the-moment increase or decrease in the current reinforcing effectiveness of a specific stimulus.
  • Unconditioned motivating operation
    States of satiation and deprivation in the presence of events, operations, and stimulus conditions that a person needs or values inherently without training.
  • ABA terms you need to know: Transitive MO (CMO-T)Transitive MO (CMO-T)
    A type of conditioned motivating operation that is established when an environmental variable establishes another event as a reinforcer or punisher, meaning that a deprived item can only be acquired…
  • ABA terms you need to know: Surrogate CMO-S.Surrogate MO (CMO-S)
    A type of conditioned motivating operation that is established when a previously neutral stimulus acquires its evocative and value-altering effect by having been paired with an unconditioned motivating operation.
  • Setting events
    An internal or external antecedent event or condition (e.g., motivating operation) that has an influence on the occurrence of a specific behavior.
  • ABA terms you need to know: Reflexive MO.Reflexive MO (CMO-R)
    A type of conditioned motivating operation that is established when a stimulus comes before and signals the onset of pain/something aversive, making it so that the removal of this warning…
  • Function-altering effect
    A phenomenon where the consequence of a behavior in the presence of an MO changes the behavior evoked by the specific or similar MOs in the future.
  • Four-term contingency
    A motivating operation is added to a three-term contingency and the added component of motivation has an abative or evocative effect on the behavior (e.g., MO-SD-Bx-C).
  • Establishing operation
    A type of motivating operation that is the product of deprivation that, at that moment, increases the effectiveness of the deprived stimulus as a reinforcer and increases the frequency of…
  • Evocative effect
    A type of behavior-altering effect that causes an in-the-moment increase in the current frequency of behavior that’s been reinforced by a specific stimulus.
  • Conditioned motivating operation (CMO)
    An MO that, due to learning history, changes the value of other stimuli, objects, or events, and creates an in-the-moment change in the frequency of any behavior associated with those…
  • Behavior-altering effect
    An effect of motivating operations that causes an in-the-moment increase or decrease in the current frequency of behavior that’s been reinforced by a specific stimulus.
  • Abolishing operation
    A type of motivating operation that is the product of satiation that, at that moment, decreases the effectiveness of the stimulus as a reinforcer as well as the current frequency…
  • Abative effect
    A type of behavior-altering effect that causes an in-the-moment decrease in the current frequency of behavior that’s been reinforced by a specific stimulus.
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    A motivating operation is not a thing that you hold in your hand. It is the state or condition of being deprived of something or satiated with something. PTB co-founder Dana Meller dives into the in-the-moment effects to help explain the difference.
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    PTB co-founder Dana Meller breaks down the distinction between motivating operations (MOs) and discriminative stimulus (SDs). Refer to BCBA® Task List (5th ed.) Sections B-10: Define and provide examples of stimulus control; and B-12: Define and provide examples of motivating operations.
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    The process of making learning stimuli more prominent to establish stimulus control and skill acquisition.
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    When a learned behavior occurs in the presence of the SD and doesn’t occur in the absence of the SD or in the presence of other stimuli (SΔ).
  • ABA terms you need to know: stimulus deltaStimulus delta (SΔ)
    A stimulus in the presence of which a given behavior has not produced reinforcement in the past or produces less reinforcement or lesser value reinforcement than when it occurs in…
  • ABA terms you need to know: over-shadowing.Overshadowing
    When the presence of a competing or distracting stimulus interferes with the acquisition of a skill/stimulus control of another stimulus.
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    When a stimulus has acquired stimulus control over a specific response, but a competing stimulus is present, blocking stimulus salience, and causing a decrease in the occurrence of the learned…
  • Faulty Stimulus Control
    When a response occurs in the presence of an irrelevant stimulus as opposed to the relevant, trained stimulus.
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    A stimulus in the presence of which specific responses have been reinforced in the past and in the absence of which the same responses have not been reinforced in the…
  • Discriminated operant
    A learned response under the stimulus control of an SD. Due to a history of reinforcement, that response occurs in the presence of that specific SD and not in its…
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    MOs and SDs do share some similarities, but there are some key differences to note. PTB co-founder Dana Meller breaks it all down to help you discriminate between MOs, SDs, and how they work together. Refer to 5th Edition Task List Sections B-10: Define and provide examples of stimulus control, and B-12: Define and provide examples of motivating operations.
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    Test your understanding of antecedents and behavior change with PTB co-founder Dana Meller. Here she explains the distinction between Sᵈs and MOs, explores their evocative function, and discusses how they can alter our behavioral repertoire when combined. Through relatable examples, Dana illustrates the importance of understanding the interplay between Sᵈs and MOs in behavior change. Refer to BCBA® Task List (5th ed.) Sections B-10: Define and provide examples of stimulus control and B-12: Define and provide examples of motivating operations.
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