For instance, the color of the walls in the lab where two subjects entered might influence them to suggest the same seemingly unrelated impressions, like mushrooms (in the study quoted above, people associated mushroom smells with the colors blue or yellow).

This is not supposed to be a final dismissive explanation for all reported anomalous psi phenomena, but I think this kind of subtle influence must be taken into account, as we now know a bit more on the subject.

Who knows, I speculate that it could produce a statistically relevant “anomaly”.

“As a filthy debunker, I must also speculate that these largely unexplored unconscious associations between different senses and concepts may have an even more unexplored relevance to psi research. If people consistently share an unnoticed bias, that could affect several experiments attempting to investigate telepathy, for instance. What may look like a very small but consistent anomaly could be product of such bias. Which is not supernatural at all.”

Speculation is fine, but it doesn’t work so well when experiments are done blind, and with subjects isolated from each other.