[FieldTrip] clusterstatistics

[Mark Noordenbos]

Dear Fieldtrippers,


I have a question about how to report the findings using clusterstatistics.
I used the cluster method to determine at which channels activity is
significant different from zero.

The cluster method revealed a significant cluster ranging from about
258-370 ms (using ft_clusterplot). If I only look at a certain channel
(e.g., Fz) the activity is only significant during 272-322 ms.


The time interval of the cluster is determined by the first and the last
sample where the activity is significant, regardless if a certain channel
shows significant activity during the complete time interval. For instance,
if a certain channel shows significant activity only at sample X and
another channel only at sample X+100, the cluster ranges from sample X to
X+100.


My problem is how to report the finding of the significant cluster. If I
report that a significant cluster was found from 258-370 ms and show a plot
of the activity at Fz (272-322 ms). Then the time intervals and p-values do
not correspond. The stat structure contains only the p-value for the time
interval of the cluster and not of the individual channels.


Any suggestions or examples of how to report clusterstatistics.

Regards,
Mark

-- 
Mark Noordenbos, MSc

Radboud University Nijmegen
Behavioural Science Institute

P.O. Box 9104, Room A05.36
6500 HE Nijmegen
The Netherlands

Email: m.noordenbos at bsi.ru.nl
Telephone: +31 24 3612070
Fax:          +31 24 3616211

http://www.ru.nl
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