[Eeglablist] How much data is necessary for ICA?

[John Johnson]

Hi Dana,

The rule of thumb is:
(channels^2)*30 as found 
[here](https://sccn.ucsd.edu/wiki/Makoto's_preprocessing_pipeline)
so
128^2*30/1024/60 = 8 minutes minimum

Regards,
John

John T. Johnson
PhD Candidate - Cognitive Motor Control Laboratory
Lab TA NEURO 4001 Neuroscience Capstone
School of Biological Sciences
Georgia Institute of Technology
john.johnson at gatech.edu
he/him/his

On 26 Apr 2020, at 11:01, Son, D.M.E. van wrote:

> Dear EEGLab list members,
>
> I have a question related to ocular and artifact rejection with ICA to 
> obtain ERPs. I read ICA might not be ideal if there are not enough 
> data points (e.g. if you only have a short EEG recording per subject). 
> There seem to be ways to cope with this, such as reducing the number 
> of channels, having a higher sample rate or using PCA.
>
> We will have 20 minutes of data per subject, 128 channels and recorded 
> the data with 1024 p/s. Does anyone know whether this will be enough 
> to confidently apply the ICA? Is reducing the number of channels or an 
> extra PCA before ICA recommended?
>
> Many thanks in advance
>
> Dana
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