[Eeglablist] P and N values in EEG data

[Makoto Miyakoshi]

Hi Humera,

Now your question makes sense to me. Thank you for your patience and
revising your question.

The answer is: The polarity (i.e. positive or negative) of an ERP
component, such as P300 or N100, has nothing to do with emotional valence
('negative stimulus' which may be disgusting or 'positive stimulus' which
may be pleasing). P or N as in P300 and N100 represent ERP polarity (i.e.
the peak amplitude) is positive or negative (i.e. minus).

Note also that ERP polarity changes as you change reference electrode. P300
can be N300 depending on your choice of reference.

In the future I will propose P3000000000 (p-three-billion) to make fun of
ERP researchers.

Makoto

On Wed, Oct 11, 2023 at 10:31 AM Humera Sharif via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Hi,
>
> Could anyone please explain what P and N (such as P300/N100 etc.) peaks in
> EEG data in response to negative stimuli (Event) indicate? P is a
> positive peak, so P in a negative stimulus means 'less disgusting, less
> negative, less hated' compared to the N peak. And does the same apply to
> the N peak for positive stimuli?
>
> Thanks in advance.
>
> Best regards,
> Humera Sharif
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