[Eeglablist] Re-referencing before or after creating bi-polar HEOG and VEOG channel

Stephen Politzer-Ahles spa268 at nyu.edu
Tue Jul 28 11:20:00 PDT 2015

Hi Melissa,

What was your electrode layout during acquisition? If you already had a
true bipolar montage (e.g., if you had had a pair of electrodes above and
below an eye but they only come out to one channel of data in the
acquisition) then those are already referenced to each other, so I believe
there is no need to re-reference those to something else (in fact I'm not
sure what it would mean); in my experience using such a setup, we
specifically excluded the bipolar EOG montages from re-referencing.

This may also depend on what method you intend to use for blink detection
and correction.


Stephen Politzer-Ahles
New York University, Abu Dhabi
Neuroscience of Language Lab

On Tue, Jul 28, 2015 at 6:47 AM, melissa scott <melissascott6 at gmail.com>

> Dear Colleagues,
> My advisor's lab recently started collecting ERP data. We decided to
> reference the electrodes to the left earlobe during data acquisition and
> plan to re-reference to the average of the left and right earlobes offline.
> We think we should also re-reference the electrodes above and below the
> eyes before we create our bipolar channel (VEOG) that we will subsequently
> use for blink detection and correction. Does this seem appropriate? We
> appreciate your thoughts and suggestions.
> thanks, Melissa
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