A century of research has resulted in a strikingly conclusive case in favor of the psi hypothesis, with support coming from multiple independent lines of evidence. However, the effects are small and challenging to reproduce, especially in the laboratory. The difficulty to demonstrate an effect thus seems at odds with the cumulative evidence.
A way to dispel this apparent paradox is to consider that psi is a very special ability which depends on conditions and circumstances that are only poorly understood. Accordingly, we don't expect to produce a psi effect every time an experiment is run. This is, of course, a common property of many human skills: just as many can play football, few can do so at the professional level, and even among professionals many shots are needed before landing the ball in the net.
Because of this fugacity, psi effects are difficult to measure. Two ways that psi research addresses this problem is either to identify subject characteristics which favor psi ability, or to develop protocols that are more conducive to producing psi effects. The search for more reliable protocols is the motivation of the Selfield* project. The protocol creates an immersive environment for experimental subjects in order to induce mental states conducive to psi. The Selfield protocol has key role in the Psi@Home project, currently underway at IMI Research. A full presentation of the Selfield protocol was published in the Journal of Parapsychology in 2019.
* The name Selfield is a playful reference to the fact that the protocol is pre-cognitive, so that the psi effect implies a linkage with one's future self. As if one's own experience is spread across a field where one's past, present and future co-exist. Hence the name.