A variation of the double-slit experiment--myth or did somone really do it? I've heard this experiment described at least three times; possibly more. However, none of the sources are terribly reliable--Scott Adams in the last chapter of The Dilbert Future (and he freely admits that he gets a lot of stuff wrong), this guy, whom it turns out is apparently a lawyer or something, and various other anonymous person(s) in my all-too-murky memory. The alleged experiment goes like this: Classic double-slit experiment, with detectors added at the slits. When activated and recording data, the detectors collapse the waveform and the screen shows particle-like behavior--nothing special here. Then, the data-recording/monitoring aspect of the detectors are deactivated, but the detectors themselves are still functioning as normal. Absolutely nothing has changed from the photon's point of view; it's still getting "detected", but the scientists watching don't know and can NEVER know the results of the "detections." And, after this modification is made, the screen shows wave-like behavior (the interference pattern.) This alleged experiment showed that 'detection' in some abstract (some would even say human- or consciousness-centric) sense is what collapses the waveform, not 'detection' in any sort of sense that preserves locality. An alternative to the mystic- and pseudoscientific-sounding "consciousness causes collapse" is perhaps "permanence causes collapse" (meaning that unless the position of the photon has been detected in such a fashion that a lasting record is possible, the waveform remains intact.) It's also been suggested (over at Wikipedia) that thermodynamic irreversibility might have something to do with this--I don't really see the connection myself, especially in light of the statistical (not absolute) nature of thermodynamic law, but it bears mentioning. So--does anyone know whether this variation of the double-slit experiment was performed? If so, any thoughts about what it implies?