Why does the Muse band have 5 electrodes but only 2 channels/1 ref?!


On the flex band on my Muse, there are what looks like 5 electrodes at AF7, Fp1, Fpz, Fp2, and AF8. However, in the Muse specifications, there are only two channels there, AF7/AF8, and the reference, Fpz. What is going on there? Is Interaxon keeping data from developers for the other 2 channels?

Channel Electrodes On Flex Band Request For Information - 2016 Muse