Twenty-Four Of Twenty-Four Carried The Envelope. Nobody Had Hypnotised Them.

LEICESTER, England — Twenty-four of twenty-four.

In one arm of this experiment nobody was hypnotised, and nobody was asked to pretend. A research assistant with a clipboard met each volunteer in a corridor and said one sentence: the envelope is needed in Room 4, and please don't discuss it on the way.

All twenty-four carried it. Two hundred metres, four fire doors, one staircase, and a stranger at the far end who took it without speaking.

The programme's most durable claim is the hypnotic courier — a person who carries a sealed message across a building, hands it over, and afterwards cannot recall doing it. This newspaper paid for a four-arm replication at two universities whose psychology departments have never published together, under a protocol lodged with a public registry before a single volunteer was approached. It is the practice this desk has used since PX-1968 and again in PX-2161, and it exists so that a disappointing result cannot be quietly rewritten into an interesting one.

What was tested

Ninety-six volunteers, screened on a standard hypnotisability scale and stratified so that each arm held six of the highest-scoring people we could recruit.

Deep induction with an explicit suggestion for amnesia. Induction without it. Simulators, told to fake convincingly enough to fool the experimenter. And plain instruction — the clipboard.

The primary outcome was fixed in advance and it was delivery: did the envelope reach Room 4.

What happened

Ninety-two of the ninety-six carried it.

The pre-registered comparison — plain instruction against induction with amnesia suggestion — returns a difference in delivery of 4.2 percentage points, with a confidence interval running from minus 7.9 to plus 16.4. It spans zero. The two laboratories, working without contact, produced estimates 1.1 points apart, and their intervals overlap along almost their whole length.

The four who did not deliver are worth naming as a group, because they are the only people in the study who exercised any judgement. One simulator asked what was inside and refused to take it. One induced volunteer sat down in a stairwell. Two went to the wrong floor and abandoned the errand.

None of them was in the plain arm.

The amnesia, priced

Reported amnesia is the part of the legend that behaved as advertised, at first.

Nineteen of the twenty-four in the amnesia arm said, at the desk afterwards, that they could not recall what they had been told to do.

Offered £20 for an accurate account of the instruction, that fell to four.

On a forced-choice recognition test administered ninety minutes later, it fell to one — and that volunteer also failed a control item planted in the same test, which is a polite way of saying we do not have a case.

The fakers were better

The most convincing amnesic couriers in the study were the people asked to pretend.

Two clinicians, blind to arm, rated every post-task account for how genuinely amnesic it seemed. The simulators scored higher than the genuinely induced subjects, and the effect was not close.

This is not our discovery. It was reported in the 1960s, it has been reproduced repeatedly since, and it has never been seriously overturned.

The clipboard

Wendy Okonkwo-Peers handed the envelope to all ninety-six volunteers and did not know, at the moment of handing it over, which arm any of them was in.

She kept a tally of her own that nobody had asked her for: the volunteers who asked her a question before setting off. There were eleven, and all eleven were in the induced arms.

Asked what she thought she was doing that worked, she said she did not think she was persuasive, and that she had said the same sentence ninety-six times and could not hear anything in it.

That is the finding. People in institutional buildings do what a person with a lanyard asks them to do, and afterwards say they do not remember, because they were not attending in the first place.

What this desk takes from it

Every component of the courier legend is real. Sealed message, unwitting carrier, blank afterwards. None of it requires hypnosis, and in this study the arm that produced it most reliably was the one that cost nothing.

The duller finding underneath is operational. The problem with a hypnotic courier was never whether it worked. It was that an ordinary instruction worked, took eleven seconds, required no screening, no induction script and no doctor to be flown in and put up in a hotel.

Professor Vance-Oduya's reply is at the foot of this page and it takes the headline off us. A null result about a technique, she writes, is not a null result about a programme; the files do not show hypnotic couriers working, they show public money spent finding out, and things done to patients in the finding out.

The desk has no answer to that, and prints it above its own conclusion.