<html><body><div style="color:#000; background-color:#fff; font-family:bookman old style, new york, times, serif;font-size:14pt"><div><span>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. </span></div><div style="color: rgb(0, 0, 0); font-size: 19px; font-family: 'bookman old style', 'new york', times, serif; font-style: normal; background-color: transparent;"><br></div><div style="color: rgb(0, 0, 0); font-size: 19px; font-family: 'bookman old style', 'new york', times, serif; font-style: normal; background-color: transparent;"><br></div> <div class="qtdSeparateBR"><br><br></div><div
class="yahoo_quoted" style="display: block;"> <div style="font-family: 'bookman old style', 'new york', times, serif; font-size: 14pt;"> <div style="font-family: HelveticaNeue-Light, 'Helvetica Neue Light', 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div dir="ltr"> <font size="2" face="Arial"> El Lunes, 11 de agosto, 2014 8:23 P.M., Makoto Miyakoshi <mmiyakoshi@ucsd.edu> escribió:<br> </font> </div> <br><br> <div class="y_msg_container"><div id="yiv8779328056"><div><div dir="ltr">Actually I found 'Peakfit' toolbox by Paul Sajda.<div><a rel="nofollow" shape="rect" target="_blank" href="http://sccn.ucsd.edu/wiki/Plugin_list_process">http://sccn.ucsd.edu/wiki/Plugin_list_process</a><br clear="none"></div><div class="yiv8779328056gmail_extra">
<br clear="none"><br clear="none"><div class="yiv8779328056yqt8779727970" id="yiv8779328056yqt00720"><div class="yiv8779328056gmail_quote">On Mon, Aug 11, 2014 at 3:32 PM, Stephen Politzer-Ahles <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:spa268@nyu.edu" target="_blank" href="mailto:spa268@nyu.edu">spa268@nyu.edu</a>></span> wrote:<br clear="none"><blockquote class="yiv8779328056gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div dir="ltr">Hi Angel,<div><br clear="none"></div><div>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:</div><div>
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</div><div>channel_idx = 4; % use channel 4 (for example) for the peak latency</div>
<div>time_window = [300 500]; % use the N400 time window (for example)</div><div>samples = find(EEG.times >= time_window(1) & EEG.times <= time_window(2)); % the samples to test</div><div>data = EEG.data( channel_idx, samples ); % pull out the data for this channel and time window<br clear="none">
</div><div>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)</div><div class="yiv8779328056gmail_extra"><br clear="all"><div>
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<div>Best,</div><div>Steve<span><font color="#888888"><br clear="none"><br clear="none"></font></span></div><span><font color="#888888">Stephen Politzer-Ahles<br clear="none">New York University, Abu Dhabi<br clear="none">
Neuroscience of Language Lab<br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.nyu.edu/projects/politzer-ahles/">http://www.nyu.edu/projects/politzer-ahles/</a><br clear="none"></font></span></div></div><div><div>
<br clear="none"><br clear="none"><div class="yiv8779328056gmail_quote">On Tue, Aug 12, 2014 at 3:27 AM, Makoto Miyakoshi <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:mmiyakoshi@ucsd.edu" target="_blank" href="mailto:mmiyakoshi@ucsd.edu">mmiyakoshi@ucsd.edu</a>></span> wrote:<br clear="none"><blockquote class="yiv8779328056gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex;">
<div dir="ltr">Dear Angel,<div><br clear="none"></div><div>Not sure about the single subject level, but for the group level my plugin std_ErpCalc() <a rel="nofollow" shape="rect" target="_blank" href="http://sccn.ucsd.edu/wiki/Plugin_list_process">http://sccn.ucsd.edu/wiki/Plugin_list_process</a> 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.</div>
<div><br clear="none"></div><div>Makoto</div></div><div class="yiv8779328056gmail_extra"><br clear="none"><br clear="none"><div class="yiv8779328056gmail_quote">On Tue, Aug 5, 2014 at 7:58 PM, Angel Tabullo <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:angeltabullo@yahoo.com" target="_blank" href="mailto:angeltabullo@yahoo.com">angeltabullo@yahoo.com</a>></span> wrote:<br clear="none">
<blockquote class="yiv8779328056gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex;"><div><div style="color: rgb(0, 0, 0); font-family: 'bookman old style', 'new york', times, serif; font-size: 14pt; background-color: rgb(255, 255, 255);">
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<br clear="none"></div><div><span style="font-family: 'times new roman', 'new york', times, serif; font-size: 14pt;">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.</span><br clear="none">
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<div><div><div><div style="color: rgb(0, 0, 0); font-family: 'times new roman', 'new york', times, serif; font-size: 14pt; background-color: rgb(255, 255, 255);"><div><br clear="none"></div><div style="color: rgb(0, 0, 0); font-size: 19px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; background-color: transparent;">
Thanks for your attention!</div><div style="color: rgb(0, 0, 0); font-size: 19px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; background-color: transparent;"><br clear="none"></div><div style="color: rgb(0, 0, 0); font-size: 19px; font-family: 'times new roman', 'new york', times, serif; font-style: normal; background-color: transparent;">
Dr. Angel Tabullo</div></div></div></div><br clear="none"><br clear="none"></div> </div> </div> </div> </div></div><br clear="none">_______________________________________________<br clear="none">
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-- <br clear="none"><div dir="ltr">Makoto Miyakoshi<br clear="none">Swartz Center for Computational Neuroscience<br clear="none">Institute for Neural Computation, University of California San Diego<br clear="none"></div>
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</blockquote></div></div><br clear="none"><br clear="all"><div><br clear="none"></div>-- <br clear="none"><div dir="ltr">Makoto Miyakoshi<br clear="none">Swartz Center for Computational Neuroscience<br clear="none">Institute for Neural Computation, University of California San Diego<br clear="none"></div>
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