[Eeglablist] EEGLAB2022 study precomputed files directory and parameters

[Agatha Lenartowicz]

Thanks Cyril!

Q1. I have different subsets of trials extracted as epoch files. It looks like if I put them in different directories - the code will do what I want. It is a little unfortunate that the specification of a directory is lost - the produced files look a little out of place in the BIDS structure.

Q2. If this is documented anywhere the link would be welcome - I couldn’t find it in the web docs. It seems like right now if I run a pre-computation of the single trial data, I need to choose parameters that will fit any analysis I may want. But what about if I want to run one analysis on ERSPs with one set of time bins, and then again with another set of time bins. Or if I want to repeat an analysis with ERSP calculated with different baselines. It seems like right now - the precomputation will overwrite existing precomputed files. I used to be able to handle that by creating new designs. As it stands - I don’t see how multiple precomputation parameters can be tested.

Agatha



> On Apr 22, 2022, at 9:42 PM, Dr Cyril, Pernet <wamcyril at gmail.com> wrote:
> 
> 
> Hi Agatha
>> Hi. I am struggling with the precomputed file creation in studies in EEGLAB 2022. I understand that the goal here is to precompute once. But there are issues I’m running into.
>> 
>> For a variety of reasons, I will have multiple studies for the same dataset. I do NOT wish to create a single study for this dataset, this is not an option for our work. To do so I am setting the ‘filepath’ variable in std_makedesign.m to my desired directory for a given study (it is correctly set in the STUDY.design.filepath. This variable however is being ignored during the precomputation and the precomputed files are being written in the data file directory (default).
>> 
>> Question 1. How do I control where the files are being written for different studies?
> 
> these are stored next to the data, doesn't matter the STUDY path -- if you want to create multiple studies then you need copies of the data
> 
> note 1 - since precompute stores all single trials, this should not make a difference to pull data from the same source
> 
> note 2 - using LIMO EEG and STUDY (create study --> browse for datasets)  allows to create as many designs as needed from the same STUDY (study sets the files to read and from there different analyses/designs are done combining as needed the subjects and experimental conditions you want to use)
> 
>> A further issue is that even for the the same study, different designs, I am getting warnings that the files will be overwritten for the current STUDY.
> if you use the 'Simple ERP STUDY' yes
>> Question 2. How do I verify that the files that get written are respecting different parameters for different designs within a study - where is this recorded?
> 
> if you use LIMO EEG then it's in the LIMO files
> 
> Cyril
> 
> 
>