Difference between revisions of "Exporting Artifact-Corrected Data"
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== Overview == | == Overview == | ||
| − | Artifact corrected data can be exported for further analysis in third party software. It is essential to keep in mind that this data will always suffer from some level of distortion. For that reason some earlier versions of BESA would even block some modalities of file export. | + | Artifact corrected data can be exported for further analysis in third party software. It is essential to keep in mind that this data will always suffer from some level of distortion. For that reason some earlier versions of BESA Research would even block some modalities of file export. |
== Choosing the Artifact-Correction Method == | == Choosing the Artifact-Correction Method == | ||
| − | BESA 6.0 onwards provides four different artifact correction possibilities | + | BESA Research 6.0 onwards provides four different artifact correction possibilities (see the BESA Research [[BESA_Research_Manual | manual]] or [ftp://h1772544.stratoserver.net/public/Research/Tutorials/ tutorial] for more details): |
| + | * Independent component analysis (ICA) | ||
| + | * Adaptive artifact correction | ||
| + | * Surrogate method | ||
| + | * Subspace-projection (SSP) | ||
| − | The adaptive method, also known as PCA-correction, is computed separately for each screen. This is the best correction method when looking through your data. However it might present discontinuities at the end or beginning of each page. The other methods instead correct the whole data set at once. Therefore it is recommended that you use one of these when exporting your artifact-corrected data. Furthermore we strongly recommend you use the ICA or surrogate method rather than the SSP method, as the | + | The adaptive method, also known as PCA-correction, is computed separately for each screen. This is the best correction method when looking through your data. However, it might present discontinuities at the end or beginning of each page. The other methods instead correct the whole data set at once. Therefore, it is recommended that you use one of these when exporting your artifact-corrected data. Furthermore, we strongly recommend you use the '''ICA or surrogate method''' rather than the SSP method, as the SSP method typically causes the largest distortions. |
== Exporting the Artifact-Corrected Data == | == Exporting the Artifact-Corrected Data == | ||
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After having applied the artifact correction: | After having applied the artifact correction: | ||
# Go to File → Export. | # Go to File → Export. | ||
| − | # To enable the artifact correction you should select the option | + | # To enable the artifact correction, you should select the option '''Current filters and current baseline for segments settings''' in "Montage and Filters" section. |
| − | # | + | # Select '''BESA binary''' in "Target data formats" section. |
# Press '''Ok''' to start the export. | # Press '''Ok''' to start the export. | ||
| − | Please note that the exported binary will have the usual "corrected" text on the upper right hand corner of the traces screen. It will however be marked red. The artifact correction can no longer be reversed at this stage. Furthermore BESA will not allow a further artifact correction to be attempted on this already corrected file. | + | Please note that the exported binary will have the usual "corrected" text on the upper right hand corner of the traces screen. It will however be marked red. The artifact correction can no longer be reversed at this stage. Furthermore, BESA Research will not allow a further artifact correction to be attempted on this already corrected file. |
| − | Although this is not recommended, you can trick BESA into forgetting that artifact correction was done by for example exporting it to other formats such to ASCII multiplexed. | + | Although this is not recommended, you can trick BESA Research into forgetting that artifact correction was done by for example exporting it to other formats such to ASCII multiplexed. |
[[Category:ERP/ERF]] | [[Category:ERP/ERF]] | ||
Revision as of 16:22, 23 March 2018
| Module information | |
| Modules | BESA Research Basic or higher |
| Version | 6.0 or higher |
Overview
Artifact corrected data can be exported for further analysis in third party software. It is essential to keep in mind that this data will always suffer from some level of distortion. For that reason some earlier versions of BESA Research would even block some modalities of file export.
Choosing the Artifact-Correction Method
BESA Research 6.0 onwards provides four different artifact correction possibilities (see the BESA Research manual or tutorial for more details):
- Independent component analysis (ICA)
- Adaptive artifact correction
- Surrogate method
- Subspace-projection (SSP)
The adaptive method, also known as PCA-correction, is computed separately for each screen. This is the best correction method when looking through your data. However, it might present discontinuities at the end or beginning of each page. The other methods instead correct the whole data set at once. Therefore, it is recommended that you use one of these when exporting your artifact-corrected data. Furthermore, we strongly recommend you use the ICA or surrogate method rather than the SSP method, as the SSP method typically causes the largest distortions.
Exporting the Artifact-Corrected Data
After having applied the artifact correction:
- Go to File → Export.
- To enable the artifact correction, you should select the option Current filters and current baseline for segments settings in "Montage and Filters" section.
- Select BESA binary in "Target data formats" section.
- Press Ok to start the export.
Please note that the exported binary will have the usual "corrected" text on the upper right hand corner of the traces screen. It will however be marked red. The artifact correction can no longer be reversed at this stage. Furthermore, BESA Research will not allow a further artifact correction to be attempted on this already corrected file.
Although this is not recommended, you can trick BESA Research into forgetting that artifact correction was done by for example exporting it to other formats such to ASCII multiplexed.
