What does the –TR or –GR suffix to my headstage description mean?
[A] TR stands for True Reference, and GR stands for Ground Reference. The difference is that a TR headstage uses a dedicated electrode as the signal reference, and a GR uses the common ground from the preamp. Some people use TR to get rid of stimulation or movement artifacts. The reference electrode will pick up the same artifact that the other electrodes will get, and this will be subtracted out in the blue preamp box.
