Overall, I found the experiments fairly convincing. I do worry a bit about what some colleagues and I used to call "the paper airplane effect": At one point we thought we had discovered that a certain fraction of the population is surprisingly deaf to certain fairly easy speech-perception distinctions; the effect, noted in a population of high-school-student subjects, was replicable; but observing one group of subjects more closely, we observed that a similar fraction spent the experiment surreptitiously launching paper airplanes and spitballs at one another.
Mark Liberman at Language Log
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