Cleve Backster, polygraph examiner for Army intelligence and the CIA, attached galvanic-response electrodes to his office Dracaena to time water uptake and instead recorded stress-like reactions when he merely pictured burning a leaf. He named the effect primary perception, extended it to brine shrimp deaths in another room, yogurt bacteria, eggs, and human cells, and published in the International Journal of Parapsychology in 1968. The replication record is the verdict: Cornell and other labs found nothing, the AAAS panel found the claim unsupportable, proposed static and humidity artifacts, and the 2005 MythBusters attempt produced the famous split, the identical polygraph model showing responses while the EEG showed none.
The professional irony is the story: Backster spent his career detecting stress in humans and one morning detected it in a plant, and his framework was interrogative from the start, the organism betraying fear under threat of harm, the polygraph as universal confession machine. Hubbard, whose E-meter was the same instrument, ran his own tomato experiments and built a cosmology on the same needle. The 1960s asked the lie detector to arbitrate consciousness itself, and the needle, obligingly, answered whoever was watching it.
The claim: primary perception is the cleanest case study of the archive's instruments-of-belief file, a device designed to detect deception detecting, instead, the observer's expectations, then generating four decades of literature, Soviet psychotronics invitations, and a persistent folk certainty that plants remember, the artifact becoming the evidence. Verdict: the replication record rules on the phenomenon, and rules against it. But the MythBusters split keeps the honest question open at the edge: the same model polygraph did move. The archive's standing note applies: when an instrument flatters its watcher, the first suspect is always the watcher's thumb on the scale, even when the thumb is a thought.
If the plant flinched at a thought, what else in the room has been listening all along?