In partial interval recording, a behavior is recorded if it occurs at:

In partial interval recording, a behavior is noted as having occurred if it takes place at any point during the designated observation interval. This method captures the presence of the behavior without requiring it to last for the entire duration of the interval. By recording it whenever it happens, partial interval recording provides a useful way to assess the frequency of behaviors that may be of interest, even if they are brief or sporadic.

This method is particularly valuable in contexts where behaviors may not be constant but still warrant monitoring, allowing for flexibility in capturing various instances throughout the observation period. This makes it a practical tool for practitioners who may want to understand occurrence patterns rather than continuous behavior.

The other choices describe specific conditions that do not align with the principles of partial interval recording, which distinctly focuses on occurrence at any moment within the defined time frame.