Locking writes your plan and its fingerprint into the log before the first trial, so nobody, including you, can move the goalposts afterward. Bem's paper didn't do this. Yours will.
When a pool has images, the deck picks one at random for that kind of target; empty pools use the drawn ones. Images stay on this device only. Load them before you lock a run, so the stimuli don't change partway through.
| Target | Trials | Found | Rate | z |
|---|
Chance is 50%. Bem reported 53.1% for his charged images.
| # | Chose | Target was | Behind it | Draw after guess | Run |
|---|
How it works: you choose first. Only after your choice is recorded does the deck roll which side holds the target and what it is, using your device's cryptographic random generator. That ordering is the whole point: you are trying to sense something that has not happened yet. Bem's 2011 "Feeling the Future" reported small effects like this; large replication attempts (Ritchie, Wiseman and French, 2012, among others) found none, and the dispute helped push psychology toward preregistering studies.