Here's how they describe it in the paper: First experiment (science conference talks from YouTube): "We selected two conference talks (in physics and engineer

Here's how they describe it in the paper: First experiment (science conference talks from YouTube): "We selected two conference talks (in physics and engineering) from YouTube and altered their acoustic features using iMovie software. The good audio quality version of each talk was created with an audio filter called “small room,” which reduces the echo and increases the clarity of the speaker; the poor audio quality version was created with an audio filter called “Large Room,” which does the opposite, increasing the echo and decreasing the clarity of the speaker." The second experiment (NPR interviews) was again using iMovie and they describe it like this: "The good audio quality version of each talk was created with no audio filters so that participants heard the interview as it was originally recorded. The poor audio quality version was created with audio filters that made it sound as if the researcher had called in on a bad phone line."