To investigate whether body acupuncture of acupuncture points specific for hearing influences the auditory avoked potentials in comparison to puncture of non-specific acupuncture points

Inclusion Criteria:

1. Healthy volunteers aged 20-40 years
2. Physical status I according to American Society of Anesthesiologists (ASA) classification
3. No history of nervous or psychiatric disease
4. Normal audiogram before the study
5. No chronic consume of analgesics, anticoagulants and/or antiplatelet agents, sedatives or alcohol
6. No local infection at the site of acupuncture
7. Volunteers who have given informed consent

Exclusion Criteria:

1. Pregnant or nursing females.
2. History of peripheral neuropathy
3. Abnormal skin conditions (infection, scars, psoriasis, eczema)
4. Inflamed site of acupuncture within 1 week

Healthy volunteers

2 weeks