[Eeglablist] peak latency analysis

[Stephen Politzer-Ahles]

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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