[Eeglablist] peak latency analysis

[Angel Tabullo]

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
>>
>>_______________________________________________
>>Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
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>>
>


-- 

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