During projection, the physical body produces chemical and electromagnetic changes, and body weight shows slight differences; electromagnetic efficacy is slightly diminished, making projection detectable.

Conduct in two stages: first, 3–6 months of engineering validation of a weighing bed and magnetometer; then recruit approximately 60 inducible individuals and 60 matched controls, each with 6–8 sessions over 18–24 months. Magnetic field experiments use SQUID arrays or optically pumped magnetometers in a magnetically shielded room, with synchronized EEG, ECG, EMG, respiration, body movement, and environmental reference channels; pre-register frequency bands, spatial patterns, and time windows around reported onset/offset, compared with the same individual's normal REM, waking imagery, and resting baseline. The weighing bed must be validated for 0.1 g measurement uncertainty under human load and dynamic performance, controlling respiratory gas exchange, evaporation, air buoyancy, bed-frame drift, cable tension, and body acceleration; verify sensitivity with blind placement of standard weights; analyze platform changes after removing transient mechanical artifacts and post-regression recovery. The chemical substudy collects saliva cortisol and melatonin at baseline and approximately 0, 20, and 40 minutes after the event, matched for circadian phase, with natural waking and identical sampling controls; if blood samples are needed, use pre-placed catheters and control stress; neurotransmitters are only exploratory peripheral indices. After freezing analysis, replicate at an independent center.

Event-Locked Biomagnetic, Gravimetric, and Endocrine Measurements During Reported Out-of-Body Experiences

If a repeatable mass deviation excluding known material exchange and external forces appears, this would challenge the hypothesis that 'body weight changes can be explained by mass balance and forces'; ordinary magnetic field or hormonal changes would not.

Matthew J. Brookes — University of Nottingham, Sir Peter Mansfield Imaging Centre，提供高灵敏度生物磁测量技术，非该主张的验证者：[研究介绍](https://www.nottingham.ac.uk/vision/a-quantum-leap-for-brain-imaging); Ken A. Paller — Northwestern University, Cognitive Neuroscience Laboratory，提供睡眠事件标记范式：[研究论文](https://doi.org/10.1016/j.cub.2021.01.026); University of Virginia School of Medicine — Division of Perceptual Studies，提供出体体验研究背景：[研究方向](https://med.virginia.edu/perceptual-studies/our-research/)

This is a more specific item, but 'slight weight difference' and 'electromagnetic efficacy loss' still lack units, direction, frequency bands, or lower bounds; these must be defined in advance, otherwise any fluctuation can be post-hoc interpreted as consistent.

No direct test meeting the above event synchronization, adequate controls, and DOI was confirmed; 0.1 g display resolution does not equal human dynamic measurement accuracy; magnetic field reduction does not equal energy loss; salivary or blood neurotransmitters do not directly represent brain concentrations.