Final answer:
In the study by Harrison et al., the negative emotions recalled by participants serve as the dependent variable, which is influenced by their depression status, the independent variable.
Step-by-step explanation:
In the study conducted by Harrison et al., the negative emotions that participants remember after reading a short story would be considered the dependent variable. This is because in an experimental study, a dependent variable is what the researcher measures to see the effect of the independent variable. In this context, the researchers are looking at how the participants' depression status (depressed versus non-depressed), which serves as the independent variable, influences the ability to remember negative emotions from the story.