True, although it's interesting to note that the headphones used were modified Baby Orpheii (HEV60/70), combined with something called Bilsom ear defenders. Also, it's rather ingenious how they managed to make everything as non-electromagnetic as possible (running fiber for the audio signal [necessary since MRI machines use RF in high power], planning to use carbon fiber cabling...). The article isn't *that* dense, mbriant, although if you want a quick synopsis, then the article talks about headphones that are:
a) comfortable on the test subject
b) are nonmagnetic, and don't interfere with the MRI
c) can handle loud volumes (100+db)
and how everything was set up to do experiments to find out how the brain reacts to loud sounds.