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. 2020 Oct 6;11:567499. doi: 10.3389/fpsyg.2020.567499

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Copyright © 2020 Khalsa, Moseman, Yeh, Upshaw, Persac, Breese, Lapidus, Chappelle, Paulus and Feinstein.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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REST at LIBR. (Left) Chair-REST. (Middle) Floatation-REST in an open pool. (Right) Floatation-REST in an enclosed pool. The open (middle) and enclosed (right) pools are both 2.44 m in diameter and 0.28 m in depth. The domed pool contains an enclosure with a 2.44-m domed ceiling. Each pool contains 11 in. of reverse osmosis water saturated with ∼816 kg of USP grade Epsom salt (magnesium sulfate), creating a dense saltwater solution that is maintained at a specific gravity of ∼1.26, allowing participants to effortlessly float on their back while the water hovers just above the ears. The temperature of the water and the temperature of the air are both calibrated to match the temperature of the skin (∼35.0°C). For more details about how our float pools were engineered to minimize exteroceptive sensory stimulation to the nervous system, please see Feinstein et al. (2018a; 2018b).