[Eeglablist] Error STUDY: Cannot compute ERSPS because datasets do not have the same number of data points

[Makoto Miyakoshi]

Dear Nynke,

My initial guess is that you may have different epoch lengths in your
datasets in STUDY. Please check it.

Makoto


2013/11/14 Laan, L.N. van der (Nynke) <L.N.vanderLaan at uu.nl>

>  Hello all,
>
>
>
> I am using EEGlab to calculate and plot grand mean ERP’s (over multiple
> subjects) for two conditions. However, when I precompute the channel
> measures I get a message saying: ‘Cannot compute ERSPS because datasets do
> not have the same number of data points’. Afterwards I am not able to plot
> the channel measures (nothing happens) so I guess that the channel measures
> were not precomputed.
>
>
>
> Some background information: The input datasets for the study are epoched
> (and preprocessed/filtered/etc.) so for each subject I have two files
> (Subject1_conditionA and Subject1_conditionB). I have not performed ICA.
>
>
>
> The only thing that I want is an ERPimage from both conditions (for a few
> channels of interest).
>
>
>
> Does anyone know what is causing the problem? Is it a problem when the
> number of epochs is not equal (i.e., in some subjects I have 1-2 more
> trials of condition A or B)?
>
>
>
> Best regards,
>
> Nynke
>
>
>
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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