Final answer:
The scale of measure used for recording the intensity of behavior is likely interval or ratio, depending on whether a true zero point exists and if ratios can be meaningfully calculated.
Step-by-step explanation:
When a researcher is recording the intensity of a certain behavior of interest, the scale of measure is most likely interval or ratio. These levels of measurement deal with quantitative data that can be ordered and in which the differences or ratios are meaningful. If the intensity has an absolute zero point and ratios can be calculated (such as 'double the intensity'), it is a ratio scale. However, if there is no true zero point, but differences between intensity levels are consistent (such as temperature in degrees Celsius), then it would be an interval scale. In the context provided, without additional information about a true zero, it's difficult to conclude definitively between interval or ratio, yet it is most likely one of these two.