MBM and taVNS for Low Back Pain and Depressive Symptoms

Inclusion Criteria: 1. aged 50 to 85 years old 2. intact cognition (examined by the Mini-Mental State Exam, ≥ 24) 3. experiencing moderate low back pain daily or almost every day at least the previous three months (≥3 out of 10 on numeric rating scale \[NRS\]) 4. experiencing elevated depressive symptoms with the patient health questionnaire (PHQ-9) total score ranging between 5 to 19 5. able to speak and read English 6. not intent to change medication regimens for pain throughout the trial. Exclusion Criteria: 1. serious underlying illness (e.g., malignant neoplasms), 2. other psychosis, 3. elevated suicide risk as indicated by the Columbia-Suicide Severity Rating Scale (C-SSRS) score \> 2, 4. function limitation precluded the meditation practice, 5. participated meditation program before, 6. any other conditions/contraindications that prohibit the application of taVNS including but not limited to any current or past history of cardiovascular disorders, recent ear trauma, and metal implants above the level of the neck, 7. no access to the internet.