Re: [Erppcatoolkit-support] Addressing a reviewer's comment on analyzing latencies

[Muhammad A. P. <mp...@gm...>]

Thanks Joe. Just to clarify, by 'the latency analysis using windowed or
spatial PCA data' you mean that we can do only a spatial PCA on our ERP
waveform and identify a N200-like frontal negativity and record the latency
of that factor for each subject?

Muhammad



On Wed, Apr 9, 2014 at 12:01 PM, Joseph Dien <jd...@ma...> wrote:

> As you say, it's not possible to get latency effects from a temporospatial
> factor.  Now that you've isolated the ERP component, you could use the
> information about peak channel and latency to perform a latency analysis
> using windowed or spatial PCA data is one possibility.  You could also use
> the factor as a template for performing a Woody filter analysis (not a
> feature of the EP Toolkit at this point), although that has a number of
> caveats.  What would work best depends on the features of your data.
>
> Cheers!
>
> Joe
>
>
> On Apr 9, 2014, at 11:32 AM, Muhammad Adeel Parvaz <mp...@gm...>
> wrote:
>
> Dear Joe and other EPtoolkiters,
>
> We are using EPtoolkit to identify frontal N200 and P300 components and we
> analyze the amplitudes both between and within groups.
> However, a reviewer is now asking why we don't analyze latencies when many
> previous studies have shown latency differences. Since we have isolated
> temporospatial components, we don't have individual subjects' latencies.
> What would be the most effective way to address the reviewers' comment?
>
> Thanks
> Muhammad
>
>
>
>
>
> --------------------------------------------------------------------------------
>
> Joseph Dien,
> Senior Research Scientist
> Maryland Neuroimaging Center
> University of Maryland
>
> E-mail: jd...@ma...
> Phone: 202-297-8117
> http://joedien.com
>
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