Linked Ears vs. 2 Ear Reference Difference?

[Guest guest]

Hello,

2 Ear Referential Montage:

I've been doing 2 channel Z-score training using a normal referential montage

of:

*2 actives (1A and 2A ports)

*2 Ear Reference (1R and 2R ports; the 1R I usually try to keep on the same side

of the head as I place the 1A electrode but I don't think this matters?)

*1 Ground (Ground port; place on top of whichever ear)

Linked Ears:

I also have a linked ears cable but haven't used it yet (just plug both earclip

reference electrodes into the linked ears cable which then plugs into the 1R and

2R ports)

What would be the reasoning to use Linked Ears vs. the 2 ear referential

montage?

Hoping someone here has some advice,

Adam

[Guest guest]

Hi Adam,If you look in the archives you can find a number of posts about this topic. Here is one fairly comprehensive answer.:/message/14522 When you do an assessment, you are measuring channel 1 against one reference andchannel 2 against another reference. We use "inert" references, like theearlobes or the mastoid, because we want the two references to be equal, sowhatever difference we see in the signals is reflecting what is happening at theActive site.Of course we know that we're wrong in assuming that those sites are inert. They pick up signals from the activity that "leaks" out through the skull fromthe parts of the brain closest to them (i.e. the temporal). Hence, when we useA1 and A2 or M1 and M2 as references, we are actually comparing the activesagainst pale representations of the temporal lobes.The temporals, because they are furthest apart of the homologous/mirror sites welook at, because they have very different functions and because they are verysusceptible to head injuries, often have very different signals.SO, if we have, let's say, F3 signal of 20u and F4 signal of 20u, and A1 ispicking up 2u from the left temporals while A2 is picking up 4u from the righttemporals, when we look at the signals in the assessment for F3 (20-2=18) and F4(20-4=16), we could be fooled into thinking that there is a difference betweenthe two frontal sites.If, on the other hand, we use jumper to combine the two references, then both F3and F4 are being compared against the combined signal, which we KNOW is exactlythe same for both sides, and any differences we see are surely related to whatis happening at the active site.Also:/message/14620When training the same thing on both sides of the head or training phase orcoherence, you probably want to use linked references. When trainingindependent activity on the two sides, don't use linked references. So for aT3/A1/g/T4/A2 squish, for example, DO use linked; for C3/A1 beta up theta downcombined with C4/A2 SMR up theta down, DON'T.>> Hello,> > 2 Ear Referential Montage:> I've been doing 2 channel Z-score training using a normal referential montage of:> *2 actives (1A and 2A ports)> *2 Ear Reference (1R and 2R ports; the 1R I usually try to keep on the same side of the head as I place the 1A electrode but I don't think this matters?)> *1 Ground (Ground port; place on top of whichever ear)> > Linked Ears:> I also have a linked ears cable but haven't used it yet (just plug both earclip reference electrodes into the linked ears cable which then plugs into the 1R and 2R ports)> > > What would be the reasoning to use Linked Ears vs. the 2 ear referential montage? > > Hoping someone here has some advice,> > Adam>