The purpose of this study is to compare the analgesic efficacy of three different types of video/audio distraction in normal volunteers subjected to carefully controlled and non-injurious thermal pain delivered to the skin of the lower back, simulating discomfort of a lumbar puncture. Two of the distraction techniques include immersive virtual reality (VR). The most efficacious distraction technique will be used in a subsequent clinical study in cancer patients.

Inclusion Criteria:

• healthy men and women
• 18-21y, 40-60y, or older than 60y

Exclusion Criteria:

• a predisposition to motion sickness
• unusual sensitivity or lack of sensitivity to pain
• chronic pain
• peripheral neuropathy
• sensitive skin