[Eeglablist] peak latency analysis

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon Aug 11 18:08:08 PDT 2014


> if computing onset latencies for each subject and then performing a
repeated measures ANOVA is an accceptable method

No. Use standard ANOVA, not repeated measures one.

Makoto

On Mon, Aug 11, 2014 at 5:33 PM, Angel Tabullo <angeltabullo at yahoo.com>
wrote:

> Thank you so much! I've been reviewing the literature and I decided to go
> with the fractional area latency instead of the peak latency. The ERPLAB
> plugin has a tool for calculating this and other measures at individual
> subject level. My only remaining question now is if computing onset
> latencies for each subject and then performing a repeated measures ANOVA is
> an accceptable method to estimate ERP latencies.
>
>
>
>
>   El Lunes, 11 de agosto, 2014 8:23 P.M., Makoto Miyakoshi <
> mmiyakoshi at ucsd.edu> escribió:
>
>
> Actually I found 'Peakfit' toolbox by Paul Sajda.
> http://sccn.ucsd.edu/wiki/Plugin_list_process
>
>
> On Mon, Aug 11, 2014 at 3:32 PM, Stephen Politzer-Ahles <spa268 at nyu.edu>
> wrote:
>
> Hi Angel,
>
> I don't know if EEGLAB/STUDY has built-in options, but you can get a peak
> latency for any subject on any channel using MATLAB code, something like
> the following:
>
> channel_idx = 4; % use channel 4 (for example) for the peak latency
> time_window = [300 500]; % use the N400 time window (for example)
> samples = find(EEG.times >= time_window(1) & EEG.times <= time_window(2));
> % the samples to test
> data = EEG.data( channel_idx, samples ); % pull out the data for this
> channel and time window
> peak_latency = EEG.times( samples( find( data==max(data) )  ) ); % get the
> peak latency in this window (max() can be replaced with min() for a
> negative peak)
>
>  Best,
> Steve
>
> Stephen Politzer-Ahles
> New York University, Abu Dhabi
> Neuroscience of Language Lab
> http://www.nyu.edu/projects/politzer-ahles/
>
>
> On Tue, Aug 12, 2014 at 3:27 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> wrote:
>
> Dear Angel,
>
> Not sure about the single subject level, but for the group level my
> plugin std_ErpCalc() http://sccn.ucsd.edu/wiki/Plugin_list_process has an
> option to compute IC-wise peak and trough amplitude and latency measurement
> from GUI. I haven't checked the plugin for long time so if you encounter
> bugs let me know.
>
> Makoto
>
>
> On Tue, Aug 5, 2014 at 7:58 PM, Angel Tabullo <angeltabullo at yahoo.com>
> wrote:
>
>
> Hi everyone! I need to perform a peak latency analysis for P300 and N400
> potentials. I wanted to ask if it is possible to do this in EEGLAB, and, in
> case there's more than one available method, which one do you think it's
> best.
>
> Thanks for your attention!
>
> Dr. Angel Tabullo
>
>
>
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>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
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>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
>
>


-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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