Can watching someone get better make you feel less pain?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * No current psychiatric or major neurological diagnosis * No reported substance abuse within the last six months * Capable of performing experimental tasks (e.g., are able to read, able to cooperate with fMRI examination) * Fluent or native speakers of English * No current or recent history of pathological pain or reported neurological disorders * Abstained from alcohol and substance use for 48 hours * Provided informed consent * Passed fMRI screening test Exclusion Criteria: * Current presence of pain * Current or past history of primary psychiatric disorder * Current or past history of psychoactive substance abuse or dependence * Dementias * Movement disorders except familial tremor * CNS infection * CNS vasculitis, inflammatory disease or autoimmune disease * CNS demyelinating disease (e.g. multiple sclerosis) * Space occupying lesions (mass lesions, tumors) * Congenital CNS abnormality (e.g. cerebral palsy) * Seizure disorder * History of closed head trauma with loss of consciousness * History of cerebrovascular disease (stroke, TIAs) * Abnormal MRI (except changes accounted for by technical factors or UBOs) * Neuroendocrine disorders (e.g., Cushings disease) * Uncorrected hypothyroidism or hyperthyroidism * Current or past history of cancer * Recent history (within two years) of myocardial infarction, severe cardiovascular disease, or currently active cardiovascular disease (e.g. angina, cardiomyopathy) * Uncontrolled hypertension or hypotension * Chronic pain syndromes * Chronic fatigue syndromes * Subjects unable to tolerate the scanning procedures (e.g., claustrophobia) * Prior treatment within the last month with any of the following: antidepressants, mood stabilizers, glucocorticoids, opiates * Prior treatment with any of the following: antipsychotics, isoniazid, centrally active antihypertensive drugs (e.g. clonidine, reserpine) * Metal in body or prior history working with metal fragments (e.g., as a machinist) * Pregnancy * Any other contraindications for MRI examination (e.g., metallic implants such as pacemakers, surgical aneurysm clips, or known metal fragments embedded in the body) * Claustrophobia