Why does a child keep pressing a button on a toy that only lights up once in a while? Why does a behavior you stopped rewarding sometimes get worse before it gets better? The answers come from schedules of reinforcement. This guide explains the four basic schedules used in ABA, with clear examples, and shows how ABA teams in North Carolina use them to build skills that last.
A schedule of reinforcement is the rule that decides when a behavior earns reinforcement. Sometimes every correct response is rewarded. Sometimes only some responses are. The schedule has a big effect on how fast a child learns, how steadily they respond, and how long the behavior lasts once rewards become less frequent.
Intermittent reinforcement is divided into four basic schedules, based on two questions: is reinforcement based on the number of responses (ratio) or the passage of time (interval), and is the requirement the same every time (fixed) or does it change (variable)?
Reinforcement comes after a set number of responses. On an FR 5 schedule, every fifth correct response earns a reward.
Examples: earning a token after every three completed math problems; a punch card that gives a free smoothie after ten purchases.
Typical pattern: high, steady responding with a short pause right after each reward.
Reinforcement comes after an average number of responses, but the exact number changes. On a VR 4 schedule, a reward might come after 2 responses, then 6, then 3, then 5.
Examples: slot machines; a toy that only lights up on some button presses; a child who sometimes gets a "yes" after asking for a treat.
Typical pattern: the highest and most steady rate of responding, and the most resistant to extinction. This is why a behavior that has been reinforced "every so often" can be very hard to stop.
Reinforcement is available for the first response after a set amount of time has passed. On an FI 5-minute schedule, the first correct response after five minutes earns a reward.
Examples: checking the oven when a recipe says 20 minutes; a weekly allowance for having a clean room on Sunday.
Typical pattern: a "scallop" shape, with slow responding right after a reward and faster responding as the time gets close.
Reinforcement is available for the first response after an average amount of time, but the exact time changes.
Examples: checking for a text from a friend; a teacher who praises on-task work at unpredictable times during class.
Typical pattern: slow but very steady responding.
When a child is learning a new skill, the team usually reinforces every correct response. Once the skill is solid, they gradually move to an intermittent schedule. This is called schedule thinning. It keeps the skill strong while making it look more like real life, where people are not rewarded every single time.
A token economy is often a fixed ratio schedule. A child might start by earning a break after two tokens, then four, then six, which builds the ability to complete longer tasks at school and home.
If a tantrum sometimes ends with a parent giving in, the tantrum is on a variable ratio schedule. That pattern makes it very persistent. Knowing this helps families understand why consistency matters so much.
When reinforcement stops for a behavior that used to be rewarded, the behavior often gets worse for a short time before it decreases. Teams plan for this and pair it with teaching a better way to get the same need met, using strategies such as differential reinforcement.
1. A child earns a sticker after every 5 words read.
Answer: Fixed ratio (FR 5).
2. A teacher checks on-task behavior at random times, about every 10 minutes on average.
Answer: Variable interval (VI 10 minutes).
3. A child gets a cookie for asking politely, but only some of the time, unpredictably.
Answer: Variable ratio.
4. Mail comes once a day at about the same time, and you check the mailbox right before then.
Answer: Fixed interval.
5. Which schedule produces the highest steady rate of responding?
Answer: Variable ratio.
It depends on the goal. Continuous reinforcement is best for teaching new skills. Variable ratio schedules produce the highest, steadiest responding and are the most resistant to extinction.
Intermittent reinforcement helps skills last and look more like real life, where rewards do not follow every action.
Schedule thinning is the gradual move from frequent reinforcement to less frequent reinforcement once a skill is learned.
Yes. ABA for children with autism is covered by most insurance payors in North Carolina. See the plans we accept on our insurance page.
Sunny Skies ABA provides in-home and school-based ABA therapy for children and young adults with autism, ages 2 to 21, across North Carolina. We help families use reinforcement in ways that fit everyday routines. Book a free consultation to get started.
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