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can I test for correlations between neuronal data and quantitative stimulus and behavioural variables? - FieldTrip toolbox</span></a></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt;">It is important to make a distinction between categorical and quantitative independent variables, because these are associated with different test statistics.</span></div>
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<span style="font-size: 9pt;"></span><span style="font-size: 9pt;">in the examples for </span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt;">Quantitative Independent Variable</span><font color="#b00000" face="Calibri,Helvetica,sans-serif,serif,EmojiFont"><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt;">,</span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt;">
</span></font><font face="Calibri,Helvetica,sans-serif,serif,EmojiFont"><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">it seems th</span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">at
all parameter settings are the same for both </span></font><font face="Calibri,Helvetica,sans-serif,serif,EmojiFont"><span style="border-bottom-color:rgb(33,37,41); border-left-color:rgb(33,37,41); border-right-color:rgb(33,37,41); border-top-color:rgb(33,37,41); box-sizing:border-box; color:rgb(33,37,41); font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px; text-align:justify"><span style="border-color: rgb(33, 37, 41); color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">ft_statfun_indepsamplesregrT</span></span><span style="background-color:rgb(255,255,255); border-bottom-color:rgb(33,37,41); border-left-color:rgb(33,37,41); border-right-color:rgb(33,37,41); border-top-color:rgb(33,37,41); color:rgb(33,37,41); display:inline; font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px; text-align:justify"><span style="border-color: rgb(33, 37, 41); color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">
and </span><span style="border-bottom-color:rgb(33,37,41); border-left-color:rgb(33,37,41); border-right-color:rgb(33,37,41); border-top-color:rgb(33,37,41); font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px"><span style="border-bottom-color:rgb(33,37,41); border-left-color:rgb(33,37,41); border-right-color:rgb(33,37,41); border-top-color:rgb(33,37,41); box-sizing:border-box; font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px"><span style="border-color: rgb(33, 37, 41); color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">ft_statfun_correlationT.</span></span></span></span></font><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt;"> </span><font color="#212529" face="-apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica Neue, Arial, sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol"><span style="border-bottom-color:rgb(33,37,41); border-left-color:rgb(33,37,41); border-right-color:rgb(33,37,41); border-top-color:rgb(33,37,41); color:rgb(33,37,41); font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px"><span style="border-color: rgb(33, 37, 41); color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">
"design" only has one row with behavioural data, and only the brain data as Input for </span><span style="border-bottom-color:rgb(33,37,41); border-left-color:rgb(33,37,41); border-right-color:rgb(33,37,41); border-top-color:rgb(33,37,41); font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:13.33px; font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px"><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; display: inline !important; font-size-adjust: none; font-stretch: 100%;">ft_freqstatistics: </span></span></span></font></div>
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<font color="#212529" face="-apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica Neue, Arial, sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol"><span style="border-bottom-color:rgb(33,37,41); border-left-color:rgb(33,37,41); border-right-color:rgb(33,37,41); border-top-color:rgb(33,37,41); color:rgb(33,37,41); font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px"><span style="border-bottom-color:rgb(33,37,41); border-left-color:rgb(33,37,41); border-right-color:rgb(33,37,41); border-top-color:rgb(33,37,41); font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:13.33px; font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px"><span style="text-align: left; color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 10pt; display: inline !important;"><font size="3" style="background-color: rgb(255, 255, 255);"><span style="font-size: 9pt;">
</span></font></span><span style="text-align: left; color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; display: inline !important;">n1 = 3; % n1 is the number of subjects
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<pre style="background-color:rgb(255,255,255); font-size:16px; text-align:justify"><font color="#212529" face="-apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica Neue, Arial, sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol"><span style="border-bottom-color:rgb(33,37,41); border-left-color:rgb(33,37,41); border-right-color:rgb(33,37,41); border-top-color:rgb(33,37,41); color:rgb(33,37,41); font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px"><span style="border-bottom-color:rgb(33,37,41); border-left-color:rgb(33,37,41); border-right-color:rgb(33,37,41); border-top-color:rgb(33,37,41); font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:13.33px; font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px"><span style="text-align: left; color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; display: inline !important;">design(1,1:n1) = [0.6 0.9 0.1]; %here we insert our independent variable (behavioral data) in the cfg.design matrix, in this case reaction times of 3 subjects.</span><span style="text-align: left; color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 10pt; display: inline !important;">
</span><span style="text-align: left; color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; display: inline !important;">cfg.design = design;</span><span style="text-align: left; color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 10pt; display: inline !important;">
</span><span style="text-align: left; color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; display: inline !important;">cfg.ivar = 1; </span><span style="text-align: left; color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 10pt; display: inline !important;">
</span><span style="text-align: left; color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; display: inline !important;">stat = ft_freqstatistics(cfg, data_brain{:});
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<pre style="background-color:rgb(255,255,255); font-size:16px; text-align:justify"><font color="#212529" face="-apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica Neue, Arial, sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol"><span style="border-bottom-color:rgb(33,37,41); border-left-color:rgb(33,37,41); border-right-color:rgb(33,37,41); border-top-color:rgb(33,37,41); color:rgb(33,37,41); font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px"><span style="border-color: rgb(33, 37, 41); color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">However, in another post </span><a style="border-bottom-color:rgb(0,102,204); border-left-color:rgb(0,102,204); border-right-color:rgb(0,102,204); border-top-color:rgb(0,102,204); font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px" href="https://mailman.science.ru.nl/pipermail/fieldtrip/2015-February/008950.html" target="_blank" rel="noopener noreferrer"><span style="border-color: rgb(0, 102, 204); color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">https://mailman.science.ru.nl/pipermail/fieldtrip/2015-February/008950.html</span></a></span></font></pre>
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<div style=""><a style="border-bottom-color:rgb(0,102,204); border-left-color:rgb(0,102,204); border-right-color:rgb(0,102,204); border-top-color:rgb(0,102,204); font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px" href="https://mailman.science.ru.nl/pipermail/fieldtrip/2015-February/008950.html" target="_blank" rel="noopener noreferrer"><span style="border-color: rgb(0, 102, 204); color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">[FieldTrip]
calculating behavioural-power correlation</span></a></div>
<div style=""><span style="border-color: rgb(102, 102, 102); color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">Dear Frederic, >From my limited understanding,
the way you specify your design matrix seems correct to me.I did the same thing as well, however, I was not interested in the correlation along the time dimension, and I averaged some frequencies to examine my behavioural-power change correlation with specific
frequency bands (e.g. 2 - 4 Hz for Delta band, 4 - 8 Hz for Theta band, etc).</span></div>
<div style=""><span style="border-color: rgb(166, 166, 166); color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">mailman.science.ru.nl</span></div>
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<pre style="background-color:rgb(255,255,255); color:rgb(0,0,0); font-size:16px"><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">it says "create a variable for the </span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">behavioural measure such that the variable contains a powspctrm field with </span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; margin-top: 0px; margin-bottom: 0px; font-size-adjust: none; font-stretch: 100%;">the behavioural information for every frequency" as the other Input for </span><span style="font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:13.33px; font-size-adjust:none; font-stretch:100%; margin-bottom:0px; margin-top:0px"><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; display: inline !important; font-size-adjust: none; font-stretch: 100%;">ft_freqstatistica</span></span><span style="font-size: 9pt;">. Here "design" has two rows. </span>
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</span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; display: inline !important;"> cfg.design = [];</span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 10pt; display: inline !important;">
</span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; display: inline !important;"> cfg.design(1,:) = [ones(1,lenght(Y)) 2*ones(1,length(Y))];</span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 10pt; display: inline !important;">
</span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; display: inline !important;"> cfg.design(2,:) = [1:length(Y) 1:length(Y)];</span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 10pt; display: inline !important;">
</span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt; display: inline !important;"> freq_stat = ft_freqstatistica(cfg,AVG,dum);</span>
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<span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt;"></span>
<pre style="background-color:rgb(255,255,255); color:rgb(0,0,0)"><font face="Calibri, Helvetica, sans-serif" size="3"><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt;">Therefore the information is not consistent. Could someone help me understanding it?</span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 10pt;">
</span></font><font face="Calibri, Helvetica, sans-serif" size="3"><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 9pt;">Best,</span><span style="color: rgb(0, 0, 0); font-family: Calibri,Helvetica,sans-serif; font-size: 10pt;">
</span></font><font face="Calibri, Helvetica, sans-serif" size="3"><span style="font-size: 9pt;">Juan</span></font></pre>
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