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When a study participant is in the scanner, I communicate with them via a headphone-speaker system. They wear air conductance headphones so they can hear me, and I hear them through the device you see in the picture. When the top right button is lit up, I can hear everything going on in the room with the scanner. When the bottom right button is lit up, they can hear me. The knobs on the left control volume. The button on the middle right allows them to hear music, but I never do that because I don't want my participants to be distracted from the task at hand. Finally, the head phones are air conductance so that they don't require any metal, which may interfere with the signal that the scanner is trying to pick up to determine their brain activation.