[FieldTrip] time-frequency analysis

minsa at fastmail.co.uk minsa at fastmail.co.uk
Fri Jul 1 12:25:43 CEST 2011


I'm new to field trip and I have two short questions regarding time-frequency analysis:

I'm using field trip for averaging time frequency plots of 11 subjects obtained by BESA 5.3. For every subject I have two conditions, and I want to calculate (using statistical clustering) the difference bettween the two conditions.

Are the single time-frequency plots normalized before clustering?

After performing the average over subjects, I get a matlab-window titled 'TFC-selectplots'. The window is subdivided into 3 sections (Plots of original data, Grand average plots and Results of statistical tests). I find in the last section 'show clustering with prob. below alpha, plotted over' where I mark 'Diff. Between grand average' and 'No mask'. I get a window with the clustered difference between the two conditions. Now my question: The color-bar show symmetric values (from blue to red) 0.1, 0, 0.1, 0.2. What do these numbers correspond to? statistical probabilities? 

can you please help me with these two questions? I would be so thankful!

Best regards, Iris

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