<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Title" content="">
<meta name="Keywords" content="">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:Calibri;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:Calibri;
color:windowtext;}
span.msoIns
{mso-style-type:export-only;
mso-style-name:"";
text-decoration:underline;
color:teal;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:Calibri;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style>
</head>
<body bgcolor="white" lang="EN-US" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt">Dear colleagues,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I would like to measure the latency of the absolute peak amplitude (max or min) of a waveform within trial epochs for each condition (bin). I found some code from a previous post about how to measure peak
amplitude latency that I was able to get to work, but I have been unable to figure out how to measure it for each bin specifically. I’ve tried using pop_selectevent() to loop through and select each bin, but it doesn’t seem to be working as the same peak
amplitude values are being returned for each iteration. Also, I’ve noticed that that the loop only returns values for 3 iterations, despite that there are 4 bins. If anyone can provide any insight into how I can restrict latency measurements by bin, I would
greatly appreciate it if you would be willing to share it with me. My code is below.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Best wishes,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Laura Morett<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">bin_list = 1:4 % bins<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">nbin = length(bin_list); % number of bins<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> % Get latency of amplitude peaks in trial<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> for b=1:nbin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> EEG_select = pop_selectevent( EEG, 'bini',bin_list(b),'deleteevents','off','deleteepochs','on','invertepochs','off');<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> for ch=1:nchan % Loop through all channels<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> channel_idx = channel_list(ch); % select channel<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> time_window = [-300 1200]; % epoch to test (trial duration)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> samples = find(EEG_select.times >= time_window(1) & EEG_select.times <= time_window(2)); % the samples to test<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> data = EEG_select.data( channel_idx, samples ); % pull out the data for this channel, and time window<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">peak_latency = channel_list(ch), EEG_select.times( samples( find( data==max(data) ) ) ); % get the peak latency in this window (max() can be replaced with min() for a negative peak)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> end<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> end<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none">********************************************************<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">Laura M. Morett<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">Hilibrand Postdoctoral Fellow<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">Yale Child Study Center<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">230 S. Frontage Rd.<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">New Haven, CT 06520<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none">As of August 16, 2017:<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">Assistant Professor of Educational Psychology<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">Educational Neuroscience Initiative<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">University of Alabama<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">Box 870231<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">Tuscaloosa, AL 35487-0231<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none">Email: <a href="mailto:laura.morett@yale.edu"><span style="color:#0000E9">laura.morett@yale.edu</span></a><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">Phone: (203) 737-4586<o:p></o:p></p>
<p class="MsoNormal">Web: <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__lauramorett.strikingly.com_&d=CwMF-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=7RydtjFxlOLitiTKeuyufwjZVnuS2cr0LD3ZBHQd6QA&m=hcKHc9qk081CzOBRcCJRuXs-41-8mLMuX9gmiw_QG_g&s=UQlF7t1IaNyCaJW5l4lvUXFZvEYnMtD2_GIYvnLLIaE&e="><span style="color:#0000E9">http://lauramorett.strikingly.com/</span></a><o:p></o:p></p>
</div>
</body>
</html>