[FieldTrip] statistics test on PLV of connectivity

[Jun Wang]

Thanks, Jan-Mathijs. This is really helpful, I will check the papers
you referred.

Jun

On Fri, Jan 18, 2013 at 12:55 AM, jan-mathijs schoffelen <
jan.schoffelen at donders.ru.nl> wrote:

> Hi Jun,
>
> 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 "Nonparametric statistical
> testing of coherence differences<http://scholar.google.nl/citations?view_op=view_citation&hl=nl&user=_o1t7fsAAAAJ&citation_for_view=_o1t7fsAAAAJ:zYLM7Y9cAGgC>
> , E Maris, JM Schoffelen, P Fries, Journal of neuroscience methods 163
> (1), 161-175" or "Comparing spectra and coherences for groups of unequal
> size<http://scholar.google.nl/citations?view_op=view_citation&hl=nl&user=_o1t7fsAAAAJ&citation_for_view=_o1t7fsAAAAJ:Y0pCki6q_DkC>
> , H Bokil, K Purpura, JM Schoffelen, D Thomson, P Mitra, Journal of
> neuroscience methods 159 (2), 337-345".
>
> 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.
>
> Best,
>
> Jan-Mathijs
>
>
> On Jan 12, 2013, at 1:22 AM, Jun Wang wrote:
>
> Dear fieldtrip experts,
>    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.
>
> thanks
> Jun
> _______________________________________________
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>
>
> Jan-Mathijs Schoffelen, MD PhD
>
> Donders Institute for Brain, Cognition and Behaviour,
> Centre for Cognitive Neuroimaging,
> Radboud University Nijmegen, The Netherlands
>
> Max Planck Institute for Psycholinguistics,
> Nijmegen, The Netherlands
>
> J.Schoffelen at donders.ru.nl
> Telephone: +31-24-3614793
>
>
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