Stress Relief Effect of Korean Red Ginseng

Inclusion Criteria: * Ages between 18\~65 Exclusion Criteria: * Current or past medical history, medical illnesses that are detected during clinical and physical evaluations * Current Axis 1 diagnosis or past history of schizophrenia, bipolar, or psychotic disorders assessed by SCID-IV * Current diagnosis of substance abuse assessed by SCID-IV * Taking or have taken psychiatric medication in the past 2 months * Head trauma accompanied by loss of consciousness or seizure * IQ 80 or below * Planning pregnancy, currently pregnant, or breastfeeding * Claustrophobia or other fMRI incompatible factors such as pace makers * Taking drugs, including over the counter drugs