Every behavior that keeps happening is doing something for the person. In ABA, that "something" is the behavior's function: the consequence that reinforces it and keeps it going. Knowing the common functions helps you read your data, follow a behavior plan with understanding, and make sense of most of the behavior reduction tasks that follow (D.2 to D.6).
Why it matters
Behavior reduction plans are built around function. If a learner screams to get out of a task, the plan teaches a better way to ask for a break and makes sure screaming no longer ends the task. If the same scream gets a parent's attention instead, the plan looks very different.
A plan that ignores function can backfire. Sending a learner out of the room after they tear up a worksheet removes the work, which can strengthen behavior that is maintained by escape. Your supervisor identifies the function through a functional assessment, but you are the person who sees the behavior most often, so your ABC data and observations matter.
Key ideas
- Function is about consequences, not appearance. Ask, "What happens right after this behavior that keeps it going?" not "What does it look like?"
- Behavior is maintained by reinforcement. Each common function is a type of positive or negative reinforcement.
- Social vs. automatic. In socially mediated functions, another person delivers the consequence (gives attention, hands over an item, removes a task). In automatic functions, the behavior produces its own consequence, with no one else involved.
- Same form, different function. Two learners can both hit, and one may hit for attention while the other hits to end a demand. Different forms can also share one function: crying, running away, and saying "I'm done" can all produce a break.
- One behavior can have more than one function. This is called being multiply controlled. A learner's yelling might produce both attention and breaks.
- Describe function, don't label the person. Say "this behavior appears to be maintained by attention," not "she's manipulative" or "he just wants control." Function is about the environment, not the person's character or intent.
- Motivating operations matter. A learner who has had little attention all morning is more likely to engage in attention-maintained behavior than one who has just had a long chat with a caregiver.
Definitions
- Function of behavior: the reinforcing consequence that maintains a behavior, that is, why it keeps occurring.
- Topography: the form of a behavior, what it looks like or sounds like.
- Attention (social positive reinforcement): the behavior produces a reaction from others, such as eye contact, comforting, talking, or even a reprimand.
- Access to tangibles (social positive reinforcement): the behavior produces a preferred item or activity, such as a toy, snack, tablet, or more time on the swing.
- Escape and avoidance (social negative reinforcement): the behavior removes or delays something unpleasant, such as a task, a noisy room, or a request. Escape ends something already happening; avoidance prevents or postpones it before it starts.
- Automatic reinforcement: the behavior produces its own reinforcement, without anyone else delivering it. Automatic positive adds stimulation (the sound of humming, the feel of rocking). Automatic negative removes discomfort (scratching relieves an itch).
Some teams use the memory aid SEAT: sensory, escape, attention, tangible. "Sensory" is an informal name for automatic reinforcement.
Examples from a session
Four functions, four learners
- Attention: At home, Amara (age 6) throws her cup each time her dad turns to talk on the phone. He stops, says, "Amara, no throwing," and picks it up. Throwing happens mostly when he is busy.
- Access to tangibles: At a clinic, Noah (age 4) cries and drops to the floor when the RBT puts the toy train away. Earlier staff often handed the train back to calm him.
- Escape: At school, Diego (age 11) puts his head down and refuses when a reading worksheet appears. The teacher usually takes the worksheet and says, "We'll try later."
- Automatic: In a group home, Ms. Chen (age 34) rocks and hums while alone in her room and in the busy common area alike, and no one needs to respond for it to continue.
- Non-example: "Diego puts his head down and refuses" is not a function statement. It describes topography and names no consequence that keeps the behavior going.
In each case, the RBT's job is the same: record the antecedent, the behavior, and the consequence accurately, follow the current plan, and share patterns with the supervisor.
Common mistakes / exam traps
- Judging function by what the behavior looks like. Head-banging, hand-flapping, or crying can serve different functions for different people. Look at the consequences and patterns, not the form.
- Thinking negative means bad. Escape is negative reinforcement: something is removed and behavior increases. It is not punishment.
- Deciding the function on your own. RBTs collect data and report observations. The supervisor determines function and changes the plan.
Exam trap
Escape vs. attention. When an adult both reprimands a learner and removes the task, both consequences are present. The discriminating feature is the pattern: if the behavior happens mostly right after demands and the task then ends or is delayed, escape is the likely function, even though the adult also talks to the learner. If it happens mostly when attention is low, whatever the task, attention is more likely.
Exam trap
Automatic vs. social functions. Repetitive behavior such as rocking or humming is not automatically "sensory," because repetitive form can be socially maintained too. The discriminating feature is what happens when no one is around: if the behavior continues at similar levels when the person is alone and no social consequence follows, automatic reinforcement is suggested. If it drops when alone and rises when someone reacts, a social function is more likely.
Quick check
Each time her caregiver says it's time to clean up, Rosa, age 5, lies on the floor and whines. Her caregiver then puts the toys away herself. Which function is most likely maintaining Rosa's behavior?