Active Stress Induction: Negative Cognitive Perseveration On their experiment day, participants will interface with a licensed clinical psychologist who did not perform their clinical interview and who is blinded to their diagnoses. The psychologist will instruct the participant talk for 10 minutes about the worst aspects of their pain, to discuss their loss of control over their situation, the negative impact pain has had on their life and others. They will be guided to imagine that their situation will progressively worsen, and to focus on how badly they will feel as a result. Two measures of induction efficacy will be given: subjective verbal rating (0-10) and objective rating by attending psychologist (0-10). The intervention ends at 10 minutes and the remainder of the study involves biodata measurement.