Intervention for Intrusive Negative Thinking

"Participants will be instructed to attend to sensory stimuli and to press a button as quickly and accurately as possible while ruminating. Stimuli will consist of vibration via a wearable subwoofer or non-painful electrical muscle stimulation (10Hz biphasic current with a pulse width of 200us with rectangular 2 electrodes placed on the back near the shoulders) or vibratory stimulation with a vibroacoustic element placed on the back near the shoulders. Up to four sessions will be approximately 45 minutes, over the course of two weeks."