Overview
Concepts and Principles is Section B of the BCBA Test Content Outline and has 24 task statements, more than any other section. It covers the units of analysis, respondent and operant conditioning, the four basic contingencies, reinforcer and punisher types, simple and compound schedules, extinction, stimulus control and generalization, motivating operations, rule-governed behavior, Skinner's verbal operants, emergent relations, behavioral momentum, the matching law, and imitation.
Items test whether you can identify a principle in a described situation, not whether you can recite a definition. Most questions give an antecedent, a behavior and a consequence, then ask what process is at work. The section overlaps heavily with Section G, which turns these principles into procedures, so a clear grasp of the distinction between a principle and a procedure will help in both places. Watch especially for the classic confusions between negative reinforcement and punishment, MOs and discriminative stimuli, and stimulus versus response generalization.
How it's tested
Section B items describe behavior in plain language, often in homes, clinics or classrooms, and ask you to name the principle. The key to most questions is to identify what changed in the environment and what happened to the future frequency of the behavior. Distractors are almost always the closest neighbouring concept.
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Classify the contingency
A consequence is described along with the change in behavior; you decide whether it is positive or negative reinforcement or punishment.
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MO or SD
An antecedent appears before behavior and you decide whether it changes the value of the reinforcer or signals that it is available.
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Name the verbal operant
A client says something in a described context and you classify the response by its antecedent and consequence.
A child covers his ears and leaves the room whenever a vacuum starts, and leaving becomes more frequent over weeks. Options are positive reinforcement, negative reinforcement, positive punishment and negative punishment. Leaving removes the noise and the behavior increases, so the contingency is negative reinforcement, specifically escape. The unpleasant stimulus tempts candidates toward punishment, but punishment would reduce leaving.
Task statements 24
Official task statements from the Behavior Analyst Certification Board outline, in outline order.
B.1 Identify and distinguish among behavior, response, and response class.The basic units of analysis.
- What it means
- Behavior is the activity of a living organism that involves movement and interaction with the environment. A response is a single instance of behavior. A response class is a group of responses that share a function, a form, or both.
- What to understand
- Responses with very different topographies can belong to one functional response class if they produce the same effect, such as asking, pointing or crying to get a drink. Treatment often targets the class, because reducing one member may increase another.
- How it shows up
- Items ask whether a set of different actions forms one response class and why.
- Common confusion
- Thinking responses must look alike to belong to the same class.
B.2 Identify and distinguish between stimulus and stimulus class.Single stimuli versus groups defined by shared features or functions.
- What it means
- A stimulus is an energy change that affects an organism through its receptors. A stimulus class is a set of stimuli that share a formal feature (feature class), a temporal relation (antecedent or consequent) or a common effect on behavior (functional class).
- What to understand
- Arbitrary stimulus classes, such as the printed word, picture and spoken name of an object, share no physical features but evoke the same response, which links this task to equivalence in B.21. Feature classes allow generalization along physical dimensions.
- How it shows up
- Expect items asking which type of stimulus class is shown when different-looking items occasion the same response.
- Common confusion
- Assuming members of a stimulus class must look alike.
B.3 Identify and distinguish between respondent and operant conditioning.Learning through stimulus pairing versus learning through consequences.
- What it means
- Respondent conditioning pairs a neutral stimulus with an unconditioned stimulus until the neutral stimulus alone elicits a conditioned response. Operant conditioning changes the future frequency of behavior through the consequences that follow it.
- What to understand
- The key test is what controls the behavior: a preceding stimulus that elicits it (respondent) or consequences that select it (operant). Respondent behavior is reflexive and elicited; operant behavior is emitted. Many real situations involve both at once.
- How it shows up
- A vignette describes a fear reaction or a learned action and asks which type of conditioning is responsible.
- Common confusion
- Calling any behavior that follows a stimulus respondent; operant behavior also occurs in the presence of stimuli.
B.4 Identify and distinguish between positive and negative reinforcement contingencies.Adding or removing a stimulus to increase future behavior.
- What it means
- Reinforcement increases the future frequency of behavior. In positive reinforcement a stimulus is presented or increased after the response; in negative reinforcement a stimulus is removed, reduced or postponed after the response.
- What to understand
- Positive and negative describe adding or removing, not good or bad. Escape (terminating an ongoing stimulus) and avoidance (preventing or postponing one) are both negative reinforcement. Classify only after confirming that behavior increased.
- How it shows up
- Items describe a consequence and the change in behavior, then ask you to name the contingency.
- Common confusion
- Labeling negative reinforcement as punishment because the stimulus involved is unpleasant.
B.5 Identify and distinguish between positive and negative punishment contingencies.Adding or removing a stimulus to decrease future behavior.
- What it means
- Punishment decreases the future frequency of behavior. Positive punishment presents a stimulus after the response; negative punishment removes a stimulus, such as access to a preferred activity or tokens, after the response.
- What to understand
- Punishment is defined by its effect, not by the intent of the person delivering it. A reprimand that increases behavior is functioning as reinforcement. Time-out and response cost are procedures based on negative punishment.
- How it shows up
- A scenario reports that a consequence reduced behavior, and you identify which punishment contingency operated.
- Common confusion
- Assuming a consequence is punishment because it was intended as one.
B.6 Identify and distinguish between automatic and socially mediated contingencies.Whether reinforcement is produced directly by the behavior or delivered by another person.
- What it means
- Socially mediated contingencies involve another person delivering or removing the consequence, such as attention or escape from a task. Automatic contingencies are produced by the behavior itself, such as sensory stimulation from rocking or pain attenuation from scratching.
- What to understand
- Automatic reinforcement persists when the person is alone and in the alone condition of a functional analysis. Automatic does not mean unconditioned or biological only; it means no other person mediates the consequence.
- How it shows up
- Expect functional analysis data where behavior is high in the alone condition and you identify an automatic function.
- Common confusion
- Assuming automatically maintained behavior has no environmental cause.
B.7 Identify and distinguish among unconditioned, conditioned, and generalized reinforcers.Reinforcers by how they acquired their function.
- What it means
- Unconditioned reinforcers, such as food or warmth, function without prior learning. Conditioned reinforcers acquire their function through pairing with other reinforcers. Generalized conditioned reinforcers, such as money or tokens, have been paired with many reinforcers and are less dependent on any one motivating operation.
- What to understand
- Generalized reinforcers resist satiation because they can be exchanged for many backups. Praise is a conditioned reinforcer for many people but not for everyone, which matters when designing programs for a specific client.
- How it shows up
- Items ask which reinforcer type tokens, money or a favourite food represents and why that matters.
- Common confusion
- Assuming praise is an unconditioned reinforcer for every client.
B.8 Identify and distinguish among unconditioned, conditioned, and generalized punishers.Punishers by how they acquired their function.
- What it means
- Unconditioned punishers, such as painful stimulation, function without learning. Conditioned punishers acquire their function by pairing with other punishers or with the loss of reinforcers. Generalized conditioned punishers, such as disapproval, have been paired with many punishers or losses.
- What to understand
- A word like 'no' becomes a conditioned punisher only if it has been paired with other punishers or lost reinforcers. Its effect varies across people, so its function must be shown by data.
- How it shows up
- A vignette describes a stimulus that reduces behavior after pairing history, and you classify the punisher.
- Common confusion
- Treating a reprimand as a punisher without evidence that it decreases behavior.
B.9 Identify and distinguish among simple schedules of reinforcement.Fixed and variable ratio and interval schedules, plus continuous reinforcement and extinction.
- What it means
- Simple schedules include continuous reinforcement, fixed ratio, variable ratio, fixed interval and variable interval. Ratio schedules depend on a number of responses; interval schedules reinforce the first response after a period of time.
- What to understand
- Know the typical response patterns: post-reinforcement pauses on FR, high steady rates on VR, scallops on FI, and moderate steady rates on VI. Intermittent schedules produce more resistance to extinction than continuous reinforcement.
- How it shows up
- A cumulative record or description of responding is given and you identify the schedule.
- Common confusion
- Confusing interval schedules with time-based (fixed-time) schedules, which require no response.
B.10 Identify and distinguish among concurrent, multiple, mixed, and chained schedules of reinforcement.Compound schedules combining two or more simple schedules.
- What it means
- Concurrent schedules run two or more schedules at the same time for different responses. Multiple schedules alternate components, each with its own discriminative stimulus. Mixed schedules alternate components without signals. Chained schedules require completing components in order, each signalled, with reinforcement after the last.
- What to understand
- Signalling is the main distinction: multiple versus mixed, and chained versus tandem. Concurrent schedules are the basis for choice and the matching law in B.23.
- How it shows up
- Items describe two alternating conditions with or without signals and ask you to name the compound schedule.
- Common confusion
- Mixing up multiple (signalled) and mixed (unsignalled) schedules.
B.11 Identify and distinguish between operant and respondent extinction as operations and processes.Discontinuing reinforcement or pairing, and the resulting decrease.
- What it means
- Operant extinction as an operation means withholding the reinforcer that maintained the behavior; as a process it is the resulting decrease. Respondent extinction presents the conditioned stimulus repeatedly without the unconditioned stimulus, so the conditioned response weakens.
- What to understand
- Expect side effects of operant extinction such as extinction bursts, spontaneous recovery, and emotional or aggressive responding. Extinction must target the specific maintaining consequence; ignoring escape-maintained behavior is not extinction.
- How it shows up
- A vignette describes an increase in behavior right after a change and asks you to recognise an extinction burst.
- Common confusion
- Calling planned ignoring extinction regardless of the behavior's function.
B.12 Identify examples of stimulus control.Behavior that occurs more often in the presence of a particular stimulus.
- What it means
- Stimulus control exists when the rate, latency, duration or magnitude of a response changes in the presence of an antecedent stimulus because of a history of differential reinforcement in its presence.
- What to understand
- Stimulus control develops through discrimination training. Discriminative stimuli signal reinforcer availability; they do not elicit behavior the way respondent stimuli do. Faulty stimulus control occurs when an irrelevant feature acquires control.
- How it shows up
- Items describe a child who responds correctly only when a particular teacher is present and ask what is controlling responding.
- Common confusion
- Saying an SD 'causes' behavior in the reflexive sense.
B.13 Identify examples of stimulus discrimination.Responding differently in the presence of different stimuli.
- What it means
- Stimulus discrimination occurs when behavior is reinforced in the presence of one stimulus (SD) and not in the presence of another (S-delta), so responding becomes more likely in the first.
- What to understand
- Discrimination is the opposite end of the continuum from generalization. A steep generalization gradient indicates strong discrimination. Discrimination training requires consistent differential reinforcement.
- How it shows up
- A scenario asks which outcome shows a learner has discriminated between two stimuli.
- Common confusion
- Confusing an S-delta with a punisher; an S-delta signals that reinforcement is unavailable.
B.14 Identify and distinguish between stimulus and response generalization.Spread of effects across stimuli versus across response forms.
- What it means
- Stimulus generalization occurs when a response trained in the presence of one stimulus also occurs in the presence of similar untrained stimuli. Response generalization occurs when untrained responses that are functionally equivalent to the trained one also occur.
- What to understand
- Ask what is new: the situation (stimulus generalization) or the form of the behavior (response generalization). Overgeneralization, such as calling every animal 'dog', is a stimulus generalization problem.
- How it shows up
- Items describe a learner who greets a new teacher or uses a new phrase, and you identify which kind of generalization occurred.
- Common confusion
- Labeling a new response form in the original setting as stimulus generalization.
B.15 Identify examples of response maintenance.Behavior continuing after an intervention has been withdrawn.
- What it means
- Response maintenance is the extent to which a learner continues to perform a behavior after part or all of the intervention that produced it has been terminated.
- What to understand
- Maintenance differs from generalization across settings: it concerns time. It is promoted by schedule thinning, natural contingencies and teaching behaviors that contact reinforcement in daily life, which Section G.16 covers.
- How it shows up
- A follow-up probe shows a skill is still performed months later, and you identify the concept.
- Common confusion
- Calling continued performance during active intervention 'maintenance'.
B.16 Identify examples of motivating operations.Environmental variables that alter reinforcer value and related behavior.
- What it means
- Motivating operations (MOs) alter the effectiveness of a stimulus as a reinforcer or punisher (value-altering effect) and the current frequency of behavior that has produced it (behavior-altering effect). Establishing operations increase effectiveness; abolishing operations decrease it.
- What to understand
- Deprivation and aversive stimulation are common establishing operations; satiation is an abolishing operation. Unconditioned MOs need no learning, while conditioned MOs (surrogate, reflexive, transitive) acquire their effect through history.
- How it shows up
- Items describe deprivation or satiation before a session and ask how responding will change.
- Common confusion
- Calling an MO a discriminative stimulus because both come before behavior.
B.17 Distinguish between motivating operations and stimulus control.Whether an antecedent changes reinforcer value or signals reinforcer availability.
- What it means
- An MO changes how effective a consequence is and therefore how much behavior occurs. A discriminative stimulus signals that a consequence is available given a response, based on a history of differential availability.
- What to understand
- Test with the question: would the consequence be more valuable now, or is it more available now? A water bottle in view signals availability (SD); hours without water raise its value (MO). Both can operate together.
- How it shows up
- Expect vignettes that ask whether an antecedent is functioning as an MO or an SD.
- Common confusion
- Assuming every antecedent that increases behavior is an SD.
B.18 Identify and distinguish between rule-governed and contingency-shaped behavior.Behavior controlled by verbal descriptions versus direct experience with consequences.
- What it means
- Contingency-shaped behavior is selected by direct contact with consequences. Rule-governed behavior is controlled by verbal descriptions of contingencies, such as instructions, which allow behavior to be affected by delayed or improbable consequences.
- What to understand
- Rules help explain why people respond to consequences that are too delayed to reinforce behavior directly. Rule-governed behavior can be insensitive to changes in actual contingencies.
- How it shows up
- A scenario describes someone following an instruction about a distant outcome and asks which type of control is operating.
- Common confusion
- Assuming delayed consequences reinforce behavior directly.
B.19 Identify and distinguish among verbal operants.Skinner's elementary verbal operants.
- What it means
- The elementary verbal operants are the mand, tact, echoic, intraverbal, textual, transcription and copying a text, plus the autoclitic as a secondary operant. Each is defined by its controlling antecedent and the type of consequence.
- What to understand
- The mand is controlled by an MO and specifies its reinforcer. The tact is controlled by a nonverbal stimulus. Echoic, copying a text and textual responses are controlled by verbal stimuli with point-to-point correspondence; the first two also share formal similarity. Intraverbals lack point-to-point correspondence.
- How it shows up
- Items describe a verbal response with its antecedent and consequence and ask you to classify it.
- Common confusion
- Classifying by the words spoken rather than by controlling variables.
B.20 Identify the role of multiple control in verbal behavior.Verbal responses controlled by more than one variable at once.
- What it means
- Multiple control means a single verbal response is a function of more than one variable, or one variable affects more than one response. Convergent control involves several variables affecting one response; divergent control involves one variable affecting several responses.
- What to understand
- Most everyday verbal behavior is multiply controlled, for example a tact that is also partly a mand. Teaching programs can use convergent control by combining prompts, then fade the additional sources.
- How it shows up
- A vignette describes a response influenced by both an MO and a visible object and asks what this illustrates.
- Common confusion
- Forcing every response into exactly one operant category.
B.21 Identify examples of processes that promote emergent relations and generative performance.Untrained responding that arises from trained relations.
- What it means
- Emergent relations are responses that occur without direct training, such as the reflexivity, symmetry and transitivity of stimulus equivalence. Generative performance includes recombinative generalization and other novel responding derived from a history of training.
- What to understand
- Training A=B and B=C can produce untrained B=A (symmetry), A=C (transitivity) and C=A (equivalence). Matrix training and multiple-exemplar instruction promote recombination of known components.
- How it shows up
- Items describe untrained matching that appears after training two relations and ask which relation emerged.
- Common confusion
- Calling symmetry 'transitivity' when the relation involves only two stimuli reversed.
B.22 Identify ways behavioral momentum can be used to understand response persistence.Why some behavior is more resistant to change than other behavior.
- What it means
- Behavioral momentum theory holds that resistance to change depends on the rate of reinforcement in the stimulus context. Behavior reinforced at higher rates is more persistent when disrupted, much as mass affects momentum in physics.
- What to understand
- Adding reinforcement for an alternative behavior in the same context can increase persistence of the problem behavior, which helps explain treatment relapse. High-probability instruction sequences are an applied procedure linked to this idea.
- How it shows up
- A scenario asks why problem behavior returned when an intervention lapsed after a period of dense reinforcement.
- Common confusion
- Assuming more reinforcement always makes a problem behavior easier to reduce.
B.23 Identify ways the matching law can be used to interpret response allocation.How behavior is distributed across concurrent options.
- What it means
- The matching law states that the relative rate of responding on concurrent alternatives tends to match the relative rate of reinforcement they produce. Reinforcer quality, delay and response effort also influence allocation.
- What to understand
- Problem behavior can be understood as choice: if it produces richer or faster reinforcement than an alternative, it will be allocated more responding. Making the alternative richer, quicker or easier shifts allocation.
- How it shows up
- Items show reinforcement rates for two behaviors and ask how responding will be distributed.
- Common confusion
- Thinking a learner will only choose the option with any reinforcement at all.
B.24 Identify and distinguish between imitation and observational learning.Copying a model immediately versus learning by watching others' consequences.
- What it means
- Imitation occurs when a model's behavior functions as an antecedent and the imitative response closely follows it in time and form. Observational learning occurs when a person's behavior changes after watching another's behavior and its consequences.
- What to understand
- Imitation requires formal similarity and close temporal relation, and the model must control the response. Observational learning can appear later and depends on prerequisite skills such as attending and imitating.
- How it shows up
- A vignette describes a child who avoids an action after seeing a peer lose a privilege and asks which concept applies.
- Common confusion
- Calling any delayed copying 'imitation'.
High-yield concepts
The terms, rules and formulas this domain turns into questions most often.
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Four-term contingency
MO, SD, response and consequence.
- Remember
- Analyse antecedents in two parts: value (MO) and availability (SD).
- Tested as
- Framework for nearly every Section B vignette.
- Trap
- Leaving out the MO and calling every antecedent an SD.
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Negative reinforcement
Removal of a stimulus that increases behavior.
- Remember
- Escape and avoidance are both negative reinforcement.
- Tested as
- Frequently tested against punishment.
- Trap
- Equating 'negative' with 'punishment'.
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Extinction burst
A temporary increase in behavior when reinforcement stops.
- Remember
- Plan for it before using extinction.
- Tested as
- Explains why behavior worsens at first under a valid plan.
- Trap
- Concluding that the intervention failed.
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Spontaneous recovery
Reappearance of an extinguished behavior after time.
- Remember
- Occurs without reinforcement and fades if extinction continues.
- Tested as
- Appears in items on relapse and maintenance.
- Trap
- Confusing it with resurgence, which follows extinction of an alternative.
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Value-altering vs behavior-altering
The two effects of a motivating operation.
- Remember
- Both effects happen together.
- Tested as
- MO items ask about one effect or both.
- Trap
- Describing only the behavior effect.
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Conditioned motivating operations
Surrogate, reflexive and transitive CMOs.
- Remember
- A CMO-T makes another stimulus valuable, such as a missing tool needed to finish a task.
- Tested as
- Appears in mand training items.
- Trap
- Calling a CMO-R an SD.
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Mand
Verbal operant under MO control that specifies its reinforcer.
- Remember
- Mand training needs an active MO.
- Tested as
- Classification and teaching items.
- Trap
- Calling a request a tact because an object was present.
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Tact
Verbal operant controlled by a nonverbal stimulus, reinforced by generalized reinforcers.
- Remember
- Labeling a picture for praise is a tact.
- Tested as
- Classification items with similar wording.
- Trap
- Classifying by form instead of control.
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Intraverbal
Verbal response to a verbal stimulus without point-to-point correspondence.
- Remember
- Answering 'What do you drink?' with 'juice'.
- Tested as
- Contrasted with echoic responses.
- Trap
- Calling an exact repetition intraverbal.
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Stimulus equivalence
Reflexivity, symmetry and transitivity among trained and untrained relations.
- Remember
- Training two relations can yield several untrained ones.
- Tested as
- Emergent relation items.
- Trap
- Mislabeling symmetry as transitivity.
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Matching law
Relative responding matches relative reinforcement.
- Remember
- Quality, delay and effort shift allocation.
- Tested as
- Explains why alternatives must compete.
- Trap
- Expecting exclusive preference.
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Behavioral momentum
Resistance to change depends on reinforcement rate in context.
- Remember
- Dense reinforcement can make behavior more persistent.
- Tested as
- Relapse and high-p items.
- Trap
- Assuming more reinforcement always helps reduction.
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Schedule patterns
FR pauses, VR high steady rates, FI scallops, VI steady rates.
- Remember
- Intermittent reinforcement increases resistance to extinction.
- Tested as
- Cumulative record items.
- Trap
- Confusing FI with fixed-time schedules.
Side by side
Concepts candidates mix up, compared on the point that decides the answer.
Reinforcement and punishment contingencies
| Concept | Meaning | Key difference | Common trap |
|---|---|---|---|
| Positive reinforcement | Stimulus added; behavior increases. | Adds a stimulus to strengthen behavior. | Assuming the stimulus must be pleasant to an observer. |
| Negative reinforcement | Stimulus removed; behavior increases. | Removes a stimulus to strengthen behavior. | Calling it punishment. |
| Positive punishment | Stimulus added; behavior decreases. | Adds a stimulus to weaken behavior. | Ignoring whether behavior actually decreased. |
| Negative punishment | Stimulus removed; behavior decreases. | Removes a stimulus to weaken behavior. | Confusing response cost with negative reinforcement. |
Antecedent control
| Concept | Meaning | Key difference | Common trap |
|---|---|---|---|
| Discriminative stimulus (SD) | Signals reinforcer availability for a response. | Built by differential reinforcement history. | Calling it an elicitor. |
| Motivating operation (MO) | Changes reinforcer value and related behavior. | Works even when availability is unchanged. | Treating deprivation as an SD. |
| Conditioned stimulus (CS) | Elicits a respondent after pairing. | Respondent, not operant, control. | Applying operant terms to reflexes. |
Verbal operants by control
| Concept | Meaning | Key difference | Common trap |
|---|---|---|---|
| Mand | Controlled by an MO; specific reinforcer. | The listener provides what was asked for. | Classifying by the object present. |
| Tact | Controlled by a nonverbal stimulus. | Generalized reinforcement. | Calling it a mand when an object is named. |
| Echoic | Verbal stimulus, point-to-point correspondence and formal similarity. | Repeats what was heard. | Calling it intraverbal. |
| Intraverbal | Verbal stimulus without point-to-point correspondence. | Answers or continues verbal chains. | Calling a repetition intraverbal. |
Generalization and maintenance
| Concept | Meaning | Key difference | Common trap |
|---|---|---|---|
| Stimulus generalization | Trained response occurs with new stimuli. | New situation, same response. | Confusing it with response generalization. |
| Response generalization | New untrained response forms occur. | Same situation, new response. | Labeling a new setting as response generalization. |
| Maintenance | Behavior continues after intervention ends. | About time, not spread. | Measuring only during intervention. |
Exam traps
Each trap is an answer that looks right. Learn the clue that should change your mind.
-
Unpleasant stimulus means punishment
- What candidates pick
- Positive punishment
- Why it looks right
- An aversive event is mentioned in the stem.
- Why it's wrong
- If behavior increases because the stimulus is removed, the contingency is negative reinforcement, regardless of how unpleasant it is.
Clue to watch for The behavior becomes more frequent over time.
-
Deprivation as an SD
- What candidates pick
- Discriminative stimulus
- Why it looks right
- Deprivation comes before the behavior.
- Why it's wrong
- Deprivation changes reinforcer value, which is the definition of a motivating operation, not a signal of availability.
Clue to watch for The stem mentions time since last access.
-
Fixed interval vs fixed time
- What candidates pick
- Fixed interval
- Why it looks right
- Both involve a set amount of time.
- Why it's wrong
- Fixed-time schedules deliver reinforcers regardless of responding; fixed interval requires a response after the interval.
Clue to watch for The stem says the reinforcer arrives whether or not the learner responds.
-
Echoic vs intraverbal
- What candidates pick
- Intraverbal
- Why it looks right
- Both are responses to verbal stimuli.
- Why it's wrong
- If the response matches the spoken stimulus sound for sound, it is echoic.
Clue to watch for Look for exact repetition of what was heard.
-
Extinction burst means failure
- What candidates pick
- Stop the intervention
- Why it looks right
- Behavior got worse after the change.
- Why it's wrong
- A short increase is expected when reinforcement is withheld; it does not show the plan is ineffective.
Clue to watch for The increase follows immediately after extinction began.
-
Symmetry vs transitivity
- What candidates pick
- Transitivity
- Why it looks right
- Both involve untrained relations.
- Why it's wrong
- Symmetry reverses a trained pair; transitivity links stimuli through a shared member.
Clue to watch for Count how many stimuli the untrained relation involves.
Answer framework
Use this sequence for any Section B vignette that describes behavior and asks for the principle involved.
- Find the target response in the stem and describe what happened to its future frequency, rate or other dimension after the environmental change took place.
- Identify the consequence by asking whether a stimulus was added or removed, and confirm that it followed the response rather than preceding it.
- Look at each antecedent separately and ask whether it changes the value of a reinforcer (an MO) or signals that the reinforcer is available (an SD).
- If the stem involves language, classify the response by its controlling antecedent and the type of consequence it produced, not by the words used.
- Eliminate the nearest neighbouring concept by checking the single feature that separates them, such as signalling, timing or point-to-point correspondence.
Practice question
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Checklist
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Study strategy
Section B deserves 35 to 45 hours because it carries 24 scored questions and underpins the applied sections. Build a contingency table first: for each scenario you meet in study materials, write the MO, SD, response, consequence and effect on future behavior. Doing this repeatedly turns classification into a habit that transfers to assessment and intervention items.
Next, work on the areas candidates confuse most. Drill MO versus SD with paired examples, verbal operants with short descriptions of controlling variables, and schedules with cumulative records. Use a standard text such as Cooper, Heron and Heward for definitions and Skinner's Verbal Behavior summaries for the verbal operants.
Finally, practise with timed item sets. Section B items are short, so aim for about one minute each. Review misses by naming the feature you overlooked, for example whether the stimulus was added or removed. Return to this section weekly, because accurate classification is the skill that makes Sections F, G and H easier.
FAQ
How many Concepts and Principles questions are on the BCBA exam?
Concepts and Principles is Section B and has 24 of the 175 scored questions, about 14%. Only Section G has as many, so it is one of the two largest sections.
What is the difference between a principle and a procedure?
A principle describes a functional relation, such as reinforcement increasing behavior. A procedure is what a practitioner does to use it, such as a token economy. Section B tests principles; Section G tests procedures.
How do I tell an MO from an SD quickly?
Ask whether the antecedent changes how much the consequence is worth or whether it signals that the consequence is available. Value means MO; availability means SD.
Are verbal operants heavily tested?
Verbal operants and multiple control are two task statements, and verbal behavior also appears in teaching procedures elsewhere. Expect several items that require classifying responses by controlling variables.
Do I need to calculate the matching law?
Expect conceptual application more than formulas. Know that relative responding tracks relative reinforcement and that quality, delay and effort shift choice.
What is the best resource for Section B?
A comprehensive ABA textbook plus the BACB outline itself. Use the outline task statements as headings and make sure each has your own definition and two examples.
Is automatic reinforcement the same as unconditioned reinforcement?
No. Automatic means the behavior produces the consequence without another person. The consequence may be conditioned or unconditioned.
Test your Domain 2 knowledge
Try practice items that describe contingencies in everyday language and see how reliably you can name the principle at work.