[Eeglablist] Comparing between group ERP effects when they appear to have a slightly different scalp distribution?

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Tue Sep 2 12:05:56 PDT 2014

Dear Eduardo,

I should say ICA -> envtopo().


On Tue, Sep 2, 2014 at 1:35 AM, Eduardo Partridge <
eduardopartridge at gmail.com> wrote:

> I'm currently looking at ERP old/new memory effects between a control
> group and a clinical population group. In most of my experiments the two
> populations exhibit ERP old/new effects that are maximal over virtually the
> same electrodes, however, in one study, the ERP old/new effects for the
> clinical group appears to be maximal over FCz rather than CPz. When I look
> at the waveforms they appear qualitatively similar, which leads me to
> believe it is the same ERP old/new effect. This to me indicates that the
> differences between the groups in their respective scalp distributions of
> this old/new effect are merely due to general variability between
> participants. If this were the case, then what would be the best way
> of comparing these old/new effects between the groups?
> Thanks,
> Eduardo.
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Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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