33 people and that goddamn awful significance testing? And not even randomized? Pure citation bait. Edit: to highlight the problems of non-randomizing: it's no

33 people and that goddamn awful significance testing? And not even randomized? Pure citation bait. Edit: to highlight the problems of non-randomizing: it's not just the frequency that changed between experimental conditions. The conclusion could just as well have been "heart rate drops on second hearing" or "everyone's heart rate drops 4.8bpm in one day". I think that especially that last conclusion will make you think it can't be true, but as a hypothesis, it has the same status as the 440/432 manipulation.