[FieldTrip] how to make standard-score tranformations with the data format usually used in Fieldtrip

[Schoffelen, J.M. (Jan Mathijs)]

Hi Ivo,

I don’t understand what you mean with “that does not fly with the usual cnt formats”. Once you have data represented in a matrix, you can just zscore it, no? Or compute the mean and std across the relevant dimension of the data, and compute the zscore by hand. Alternatively, you can use ft_channelnormalise.

Best wishes,
Jan-Mathijs


> On 5 Aug 2022, at 15:41, Ivaylo Iotchev via fieldtrip <fieldtrip at science.ru.nl> wrote:
> 
> Dear all,
> 
> I have made good experiences in the past with applying standard-score transformation to EEG data, especially when one expects a strong difference between subjects in how the magnitude of the signal turns out in the recording.
> 
> But in standard MATLAB operations this is simply: zscore(data)
> 
> That does not fly with the usual cnt formats that use a structured representation of the data, how do you (if you happen to have done so in the past) apply this step?
> 
> Best wishes,
> 
> Dr. Ivaylo (Ivo) Iotchev
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