In an experiment to determine the minimum level of light intensity that a person can perceive, the researcher is concerned about the participants' tendency to report seeing the light even when it is not present. Which method could best address this issue?

• A. Use a single-stimulus presentation method.
• B. Alternating weak and absent stimuli.
• C. Rely solely on participant self-report.
• D. Increase the intensity of the light until it is visible to all participants.

Answer: (B)