<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Jun,<div><br></div><div>If you want to test whether within a subject the PLV across conditions is significantly different (in some statistical sense), you would either do a statistical test along the lines described in "<span class="Apple-style-span" style="border-collapse: collapse; font-family: Arial, sans-serif; font-size: 13px; line-height: 16px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><font class="Apple-style-span" color="#050505"><a href="http://scholar.google.nl/citations?view_op=view_citation&hl=nl&user=_o1t7fsAAAAJ&citation_for_view=_o1t7fsAAAAJ:zYLM7Y9cAGgC" class="cit-dark-large-link" style="font-size: 16px; text-decoration: underline; outline-style: none; outline-width: initial; outline-color: initial; ">Nonparametric statistical testing of coherence differences</a>, <span class="cit-gray">E Maris, JM Schoffelen, P Fries, </span><span class="cit-gray">Journal of neuroscience methods 163 (1), 161-175</span></font><span class="cit-gray" style="color: rgb(102, 102, 102); ">" or "</span></span><span class="Apple-style-span" style="border-collapse: collapse; font-family: Arial, sans-serif; font-size: 13px; line-height: 16px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><a href="http://scholar.google.nl/citations?view_op=view_citation&hl=nl&user=_o1t7fsAAAAJ&citation_for_view=_o1t7fsAAAAJ:Y0pCki6q_DkC" class="cit-dark-large-link" style="font-size: 16px; text-decoration: underline; color: rgb(0, 0, 204); outline-style: none; outline-width: initial; outline-color: initial; ">Comparing spectra and coherences for groups of unequal size</a>, </span><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(102, 102, 102); font-family: Arial, sans-serif; font-size: 13px; line-height: 16px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">H Bokil, K Purpura, JM Schoffelen, D Thomson, P Mitra, </span><span class="Apple-style-span" style="border-collapse: collapse; color: rgb(102, 102, 102); font-family: Arial, sans-serif; font-size: 13px; line-height: 16px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">Journal of neuroscience methods 159 (2), 337-345</span><span class="Apple-style-span" style="border-collapse: collapse; font-family: Arial, sans-serif; font-size: 13px; line-height: 16px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><span class="cit-gray" style="color: rgb(102, 102, 102); ">". </span></span></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Arial, sans-serif; font-size: 13px; line-height: 16px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><span class="cit-gray" style="color: rgb(102, 102, 102); "><br></span></span></div><div>This functionality is not supported in ft_connectivityanalysis. For the former way of statistical testing, you should use ft_freqstatistics, in combination with an adjusted version of statfun_indepsamplesZcoh in order for it to compute differential PLV, rather than Z-transformed coherence difference. Alternatively, you could ask ft_connectivity to compute a jackknife estimate of the variance of the PLV, which could be used in a traditional t-test.</div><div><div><div><br></div><div>Best,</div><div><br></div><div>Jan-Mathijs</div><div><br></div><div><br></div><div>On Jan 12, 2013, at 1:22 AM, Jun Wang wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Dear fieldtrip experts,<div> I have a question regarding to test the plv output from ft_connectivityanalysis. How can I check the significance with a statistical test based on surrogate data. the plv output didn't have the magnitude for single trials.</div>
<div><br></div><div>thanks</div><div>Jun </div>
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<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Jan-Mathijs Schoffelen, MD PhD </div><div><br></div><div>Donders Institute for Brain, Cognition and Behaviour, <br>Centre for Cognitive Neuroimaging,<br>Radboud University Nijmegen, The Netherlands</div><div><br></div><div>Max Planck Institute for Psycholinguistics,</div><div>Nijmegen, The Netherlands</div><div><br></div><div><a href="mailto:J.Schoffelen@donders.ru.nl">J.Schoffelen@donders.ru.nl</a></div><div>Telephone: +31-24-3614793</div></div></span></div></span></div></span></div></span></div></span></span>
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