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Marc W. van Iersel, Geoffrey Weaver, Michael T. Martin, Rhuanito S. Ferrarezi, Erico Mattos and Mark Haidekker

greenhouse crops. Our objective was to develop a biofeedback system that not only monitors Φ PSII and ETR, but that can also control the PPFD from LED lights to maintain a specific ETR. Controlling the intensity of actinic light based on plants’ ability to

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Cammie K. Coleman and Richard K. Mattson

Twelve 20-minute thermal biofeedback sessions were conducted with 26 university students. Visual stimuli were provided by a living foliage plant, a life-sized color photograph of that plant, or a metal stool (control). Of the participants, 38% responded positively to the presence of a live plant or plant photograph, while 23% showed lower stress in the control room. Stress reduction, as indicated by higher skin temperatures, occurred within the first 5 to 8 minutes of a 20-minute thermal-biofeedback session. A nonplant visual stimulus was not part of the experiment. The results are not intended as comparative, nor do they attribute unique or superior effects to plants. Due to the small number of participants, no significant results were obtained, but the trends were important and are being reported to help further research in this area.

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Chen-Yen Chang and Ping-Kun Chen

The purpose of this paper was to report the effects of window views and indoor plants on human psychophysiological response in workplace environments. The effects of window views and indoor plants were recorded by measuring participant's electromyography (EMG), electroencephalography (EEG), blood volume pulse (BVP), and stateanxiety. Photo Impact 5.0 was used to simulate the environment in an office, where six conditions were examined: 1) window with a view of a city, 2) window with a view of a city and indoor plants, 3) window with a view of nature, 4) window with a view of nature and indoor plants, 5) office without a window view, and 6) office without a window view and indoor plants. Participants were less nervous or anxious when watching a view of nature and/or when indoor plants were present. When neither the window view nor the indoor plants were shown, participants suffered the highest degree of tension and anxiety.

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Ahmad Hassan, Chen Qibing, Jiang Tao, Lv Bing-Yang, Li Nian, Shu Li, Li Yu Tng, Jun Zhuo Li, Shang Guan Ziyue and Muhammad Sohaib Tahir

Environ. Behav. 23 3 26 Hauri, P. 1981 Treating psychophysiologic insomnia with biofeedback Arch. Gen. Psychiatry 38 752 758 Heynen, N.C. Kaika, M. Swyngedouw, E. 2006 In the nature of cities: Urban political ecology and the politics of urban metabolism

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Seong-Hyun Park and Richard H. Mattson

.K. Mattson, R.H. 1995 Influences of foliage plants of human stress during thermal biofeedback training HortTechnology 5 137 140 Coniam, S.W. Diamond, A.W. 1994 Practical pain management Oxford Univ. Press Oxford, UK Darlington, A.B. Dat, J.F. Dixon, M.A. 2001

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Seong-Hyun Park and Richard H. Mattson

, R.H. 1995 Influences of foliage plants of human stress during thermal biofeedback training HortTechnology 5 2 137 140 Coniam, S.W. Diamond, A.W. 1994 Practical pain management Oxford Univ. Press Oxford, UK Darlington, A.B. Dat, J.F. Dixon, M.A. 2001

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Geoffrey Weaver and Marc W. van Iersel

. Martin, M.T. Ferrarezi, R.S. Mattos, E. . Haidekker, M 2016 A chlorophyll fluorescence-based biofeedback system to control photosynthetic lighting in controlled environment agriculture J. Amer. Soc. Hort. Sci. 141 169 176 Wang, Y. Wei, R. Xu, L. 2018

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Ruth Kjærsti Raanaas, Grete Grindal Patil and Terry Hartig

. Biofeedback 29 291 292 Park, S.H. Mattson, R.H. 2008 Effects of flowering and foliage plants in hospital rooms on patients recovering from abdominal surgery HortTechnology 18 563 568 Park, S

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Tina Bringslimark, Terry Hartig and Grete Grindal Patil

, Calif Coleman, C.K. Mattson, R.H. 1995 Influence of foliage plants on human stress during thermal biofeedback training HortTechnology 5 137 140 Dallner, M. Elo, A.L. Gamberale, F

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Shuyang Zhen and Marc W. van Iersel

fluorescence-based biofeedback system to control photosynthetic lighting in controlled environment agriculture J. Amer. Soc. Hort. Sci. 141 169 176 Verhoeven, A.S. Demmig-Adams, B. Adams, W.W. III 1997 Enhanced employment of the xanthophyll cycle and thermal