Consider the potential responses of participants to environmental stimuli in an experimental setting, and devise a hypothetical research study on assertiveness. It is crucial for you to keep in mind that the study should not be developed with the intention of testing participant reactivity. The study may be summarized as follows: It aims to investigate the influence of specific things in the laboratory environment on participants' responses. In this hypothetical study, certain items present in the laboratory setting are expected to elicit specific reactions from the participants. What measures may be included in your study to mitigate participant reactivity?