Dimensions of behavior
Dimensions of behavior are the measurable properties of a response: how often it repeats, how long it lasts, and when it occurs in time.
Behavior analysts describe three basic properties that can be measured. Repeatability means behavior can happen again and again, so it can be counted (frequency or count, and rate). Temporal extent means each response takes up time, so it has a duration. Temporal locus means each response happens at a point in time, so it can be measured in relation to a cue (latency) or to the previous response (interresponse time).
Other features are also measured in practice. Topography is the form or shape of the behavior, such as an open-handed slap versus a closed-fist hit. Magnitude, sometimes called intensity, is the force or size of the response, such as the loudness of a scream. Derived measures, such as percentage and trials to criterion, combine basic measures into summaries.
Choosing the right dimension is the supervisor's job, but the RBT needs to understand why a choice was made. The dimension should match what matters about the behavior. If a client's tantrums are rare but last an hour, counting them would hide the problem, while timing them shows it. If a client completes tasks correctly but takes too long to start, latency is the relevant dimension. Measuring the wrong dimension produces data that do not answer the clinical question.
Example and non-example
| Example | A supervisor asks an RBT to record both the number of tantrums and how long each one lasts, because the plan targets both how often and how long tantrums occur. |
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| Non-example | Writing "the client was frustrated today" is not a dimension of behavior; it is an unobservable interpretation, not a measured property of a response. |
Don't confuse it with
| Operational definition | An operational definition states what counts as the behavior; a dimension is which property of that behavior is measured. |
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| Continuous measurement | Continuous measurement is a way of recording; dimensions are the properties that recording captures. |
Test yourself
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Question 1A plan asks an RBT to record how long each of a teen's pacing episodes lasts, from the first step to the last. Which dimension of behavior is being measured?
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C: Duration. Duration is how long a behavior lasts from its onset to its offset. Timing each pacing episode from the first step to the last is duration recording.
- A: Latency is the time from a cue to the start of a response, not how long the response lasts.
- B: Frequency tells how many episodes happened, not how long each one lasted.
- D: Interresponse time is the gap between two episodes, not the length of an episode.
Task A.1 · 40-hour curriculum section C
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Question 2Over two weeks, a client's number of tantrums per day stays about the same, while total daily tantrum duration drops from about 40 minutes to about 12 minutes. Which conclusion do these data support?
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D: The tantrums are shorter but just as frequent. The same number of episodes adding up to far less total time means each episode is shorter on average. This is why a team may track more than one dimension: a count alone would hide this change.
- A: The count stayed about the same, so the tantrums are not happening less often.
- B: The duration data show a large change, so looking only at the count would miss real progress.
- C: Starting sooner after an instruction would show up in latency data, which were not described here.
Task A.1 · 40-hour curriculum section C
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Question 3Latency and interresponse time both describe which property of behavior?
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B: When a response occurs relative to another event. Latency (time from a stimulus to a response) and interresponse time (time between two responses) both locate a response in time relative to another event. Count reflects repetition and duration reflects how long a response lasts.
- A: How many times a response is repeated is captured by a count.
- C: How long a response lasts is its duration.
- D: Force describes the magnitude of a response, not its timing.
Task A.1 · 40-hour curriculum section C
Answer every question to see your score.
On the RBT exam
This term belongs to task A.1 Continuous measurement in content area A, Data Collection and Graphing, which is 13 of the 75 scored questions.