We measured effects of non-contact healing for plant samples (cucumber) using biophotons by 10 healers of laying-on-of-hands (5 beginners and 5 veterans). J value, the logarithm of the biophoton intensity ratio of an experimental sample and a control sample, was used as the quantitative index of healing. Moreover, the details of healing of each trial, and the past experience and healer's self-evaluation for his/her abilities were investigated with 186 items in two questionnaires. We found the average of J values of the beginner group was 0.072 and that of the veteran group was 0.166. There was a significant different between these groups (p=0.025, one tail). Since the scores of self-evaluation for healing against pains of shoulder, back, and lumbago were correlated with J values (r=0.57, p=0.043, one tail), we considered that the measured healing ability was deeply related to the ability for pain control of other persons. Moreover, healers' ages showed a positive correlation with J values (r=0.63, p=0.049, two tails), and the correlation was especially strong in the beginner group; r=0.92 (p=0.025, two tails). J values were approximated by a linear combination model with an age function and a beginner-veteran function. A character trait item "careless-prudent" was considered to be important for ability performance. From the findings, we advocate biological hypotheses for healing ability. (1) In order to control the pain produced as a result with aging, the self-healing ability for pain improves. (2) Non-contact healing to control another person's pain is an external application of self-healing ability.
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