Sensitivity to light is a common experience during prayer or Zen meditation, in both western and eastern cultures. Higher levels of happiness and lower health insurance costs are typical for those who experience inner light. In this report, the connection between the experience of inner light and Zen meditation is investigated by using EEG and flash visual evoked potential (F-VEP) recorded from the occipital site Oz. EEG results indicate that the experience of inner light during Zen meditation by experienced practitioners is also accompanied by a large amount of alpha-suppressed EEG. The F-VEP data also reflect shorter latency, and indicates a stronger and more sensitive visual response during Zen meditation. These data are also the typical physiological responses when the eyes are open during a rested conscious state, and thus provide a possible closer connection between Zen meditation and the sensitivity of inner light
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