[FieldTrip] clusterstatistics

Mark Noordenbos mark.noordenbos at gmail.com
Mon Feb 20 12:25:46 CET 2012

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

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.


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

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