12 BCBA Exam Concepts Candidates Confuse Most

1. Negative reinforcement vs. negative punishment

Both remove a stimulus. Negative reinforcement removes something aversive, and the behavior increases. Negative punishment removes something the person values, and the behavior decreases.

Example: Buckling the seatbelt stops the chime, and buckling happens faster next time: negative reinforcement.

Quick test: Look at what happens to the behavior in the future: more often → reinforcement; less often → punishment.

2. Positive vs. negative (in reinforcement and punishment)

Positive and negative mean added and removed, not good and bad. Positive punishment adds a stimulus; negative reinforcement removes one.

Quick test: Ask: was a stimulus added or taken away right after the behavior?

3. Extinction vs. negative punishment

Extinction stops delivering the specific reinforcer that has maintained the behavior. Negative punishment removes some other reinforcer contingent on the behavior.

Example: Attention-maintained calling out is ignored (extinction) vs. calling out loses five minutes of recess (negative punishment).

Quick test: Is the reinforcer that maintained this behavior simply no longer delivered? Then it's extinction.

4. Motivating operation (MO) vs. discriminative stimulus (SD)

An SD signals that a reinforcer is available for a response. An MO changes how valuable the reinforcer is, and how likely behavior that has produced it is right now.

Example: Skipping lunch makes food more valuable (MO); the open café sign signals food can be bought (SD).

Quick test: Does it change how much they want it (MO), or whether it's available (SD)?

5. DRA vs. DRI

DRA reinforces an alternative behavior that serves the same function. DRI reinforces a behavior that physically can't happen at the same time as the problem behavior.

Example: Reinforcing hands-in-pockets to reduce hand flapping is DRI; reinforcing asking for a break instead of eloping is DRA.

Quick test: Can the person do both at once? If not, it's DRI.

6. DRO vs. DRL

DRO delivers reinforcement when the problem behavior doesn't occur for an interval. DRL reinforces the behavior when it occurs at or below a target rate.

Quick test: Is the goal zero occurrences (DRO) or fewer occurrences of a behavior that's fine in moderation (DRL)?

7. Partial interval vs. whole interval vs. momentary time sampling

Partial interval scores an interval if the behavior occurs at any point, so it tends to overestimate. Whole interval scores it only if the behavior lasts the entire interval, so it tends to underestimate. Momentary time sampling records only at the moment the interval ends.

Quick test: Behavior to decrease → partial interval is the conservative choice; behavior to increase → whole interval.

8. Latency vs. interresponse time (IRT)

Latency is the time from a stimulus (like an instruction) to the start of the response. IRT is the time between two responses.

Quick test: Is the clock started by an instruction (latency) or by the previous response (IRT)?

9. Reversal design vs. multiple baseline

A reversal (ABAB) design shows control by withdrawing and reintroducing treatment. A multiple baseline staggers treatment across behaviors, settings or people, with no withdrawal needed.

Quick test: If the behavior can't reverse (a learned skill) or withdrawal would be unethical (self-injury), choose multiple baseline.

10. Mand vs. tact vs. intraverbal

A mand is controlled by an MO and specifies its reinforcer. A tact is controlled by a nonverbal stimulus. An intraverbal is controlled by someone else's verbal behavior, with no point-to-point correspondence.

Example: Saying "juice" when thirsty is a mand; saying "juice" when shown a picture of juice is a tact; saying "juice" when asked "What do you drink at breakfast?" is an intraverbal.

Quick test: What controls the response: wanting something (mand), seeing something (tact), or hearing words (intraverbal)?

11. Shaping vs. fading

Shaping changes the response: you reinforce successive approximations of a target behavior. Fading changes the stimulus: the response stays the same while prompts or stimulus features are gradually removed.

Quick test: Is the behavior changing (shaping) or the support around it (fading)?

12. Stimulus generalization vs. response generalization

Stimulus generalization is the same response occurring with untrained stimuli. Response generalization is new, untrained but similar responses occurring to the same stimulus.

Example: Saying "dog" to a new breed is stimulus generalization; brushing teeth with a new motion after learning one technique is response generalization.

Quick test: Did the setting or stimulus change (stimulus generalization), or the behavior itself (response generalization)?