[Eeglablist] Correlation with N400 mean amplitude values

[Veronica Debora TORO]

Thank you very much for your reply! What if I don't want to make the difference between two conditions instead? What if I wanted to investigate separately the correlation between the mean amplitude of the N400 in response to negative (and subsequently positive) stimuli and the EQi test score?

Inviato da Outlook per Android<https://urldefense.com/v3/__https://aka.ms/AAb9ysg__;!!Mih3wA!BQhySUDHm095hk6uBVBDmesPW1-tus3wOWSdgN2ohfyDRP0yg3Hn7Ic83WK2CNMSOdyEM90haJ5WO2cr1JfNSYGa8DNblhNU4mR4B5ssjg$ >
________________________________
From: Arild Hestvik <ahestvik at gmail.com>
Sent: Friday, April 19, 2024 3:14:50 AM
To: Veronica Debora TORO <veronicadebora.toro at studenti.unipr.it>
Cc: Veronica Debora TORO via eeglablist <eeglablist at sccn.ucsd.edu>
Subject: Re: [Eeglablist] Correlation with N400 mean amplitude values

If you think of N400 as an experimental effect (the difference between two conditions), then it makes no difference whether you use the absolute value or a signed value, it is just the expression of a difference between two conditions. The sign is a result of the direction of the subtraction. Note that the if the baseline is high, the peak of the N400 difference wave does not have to be a negative voltage value, it could be greater than zero, even if you subtract control from test.

On Wed, Apr 17, 2024 at 9:37 PM Veronica Debora TORO via eeglablist <eeglablist at sccn.ucsd.edu<mailto:eeglablist at sccn.ucsd.edu>> wrote:
Dear EEGLAB users,
I have a specific question about n400 mean amplitude values.
I would like to correlate n400 mean amplitude values extracted from specific electodes and some scores (for example EQi test score).
Among the studies published in the literature, I found that some studies use raw values of n400 mean amplitude (with positive or negative sign) for correlation analyses, while others use Absolute values. In which cases Is One methodology used rather than the other? Are there advantages or disadvantages?
Thank you in Advance

Best

Debora

Inviato da Outlook per Android<https://urldefense.com/v3/__https://aka.ms/AAb9ysg__;!!Mih3wA!G9glLO3FcnPoDg0F-vus6Qy36nDYOeIdxZ9FhQGT2eXw5Y-Snz-RBGP61GdFyBZXWWHHPmle1vYxz9c6Qz2E5Kxax4DJLSkPozalYr0CHw$ >
_______________________________________________
Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
To unsubscribe, send an empty email to eeglablist-unsubscribe at sccn.ucsd.edu<mailto:eeglablist-unsubscribe at sccn.ucsd.edu>
For digest mode, send an email with the subject "set digest mime" to eeglablist-request at sccn.ucsd.edu<mailto:eeglablist-request at sccn.ucsd.edu>