>Him saying he got tired of it is not the same as the decline affect setting in, that is an assumption you have made which he did not state.
ask him about it and you'll see i'm right. reading between the lines is a thing, especially when i know parapsychology
this book is pretty good with a focus on RV and it goes into the decline effect pretty well
https://www.amazon.com/Outside-Gates-Science-Time-Paranormal/dp/1560259868
this one is pretty good and quick
Outside the Gates of Science: Why It's Time for the Paranormal to Come in from the Cold
Broderick, best known as a science-fiction writer, returns to nonfiction (after 2001's The Spike) to evaluate various research programs investigating "psi phenomena." Divided into two branches, psi phenomena cover anomalous cognition, which includes telepathy, remote viewing and other forms of "non-material" communication; and anomalous perturbation, psi-mediated action or psycho-kinetics.
Broderick remains analytical and objective throughout, reviewing the work of such laboratory programs as the Princeton Engineering Anomalies Research group, the Science Applications Incorporated Corporation and the CIA-backed Stargate; recounting their experiments' designs, methods and procedures, Broderick then goes on to examine rigorously the resulting data. He concludes that while the evidence for various kinds of psi phenomena is strong, there are unknown (and possibly unknowable) factors that make classical, reductionist methods of testing it unpredictable and irreproducible (the reason, he suspects, that the CIA gave up on such research in 1995). Gratifyingly, Broderick connects the search for psi phenomena to larger philosophical questions while remaining skeptical and delightfully rational throughout.