Physiological effects of Shinrin-yoku (taking in the atmosphere of the forest)–using salivary cortisol and cerebral activity as indicators

Park BJ, Tsunetsugu Y, Kasetani T, Hirano H, Kagawa T, Sato M, Miyazaki Y.
J Physiol Anthropol. 2007 Mar;26(2):123-8

https://www.ncbi.nlm.nih.gov/pubmed/17435354