Which measurement method records the amount of time a behavior occurs?

Duration recording is the correct answer because it specifically measures the total time that a particular behavior occurs during an observation period. This method allows the therapist to capture not just how many times a behavior happens but how long each instance lasts, which can provide insight into the intensity and persistence of the behavior.

In contrast, frequency count tracks the number of times a behavior occurs within a specific time frame but does not provide information on how long the behavior lasts. Interval time sampling looks at whether a behavior occurs during predetermined intervals, which helps in tracking patterns of behavior but does not measure duration. A response definition outlines the specific criteria for what constitutes a particular behavior, but it doesn’t involve measurement in itself. Thus, duration recording is the method specifically designed to assess the time span of behaviors, making it the correct choice in this context.