[Eeglablist] Correlation with N400 mean amplitude values

[Arild Hestvik]

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> 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
>
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