|
⇤ ← Revision 1 as of 2016-01-22 12:05:31
Size: 1510
Comment: Construction of the tutorial for "process_evt_transfer"
|
Size: 2663
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| = Tutorial XX: Synchronization with Eyetracker data = | = Tutorial XX: Synchronization with Eyetracker data (event transfer) = |
| Line 4: | Line 4: |
| This tutorial introduces how to synchronize ocular data recorded with an '''EyeLink '''eye tracker (''SR Research, Canada'') with EEG / MEG raw data. | This tutorial introduces how to transfer events from one data set to a second data set of a different type, which was recorded at the same time. We will explain this on the example of synchronizing ocular data recorded with an '''EyeLink '''eye tracker (''SR Research, Canada'') with a second raw recording, e.g. EEG. |
| Line 9: | Line 11: |
| Eye tracking is useful to detect blinks, saccades, microsaccades and fixations during an experiment. Typically, the eye tracker software will itself mark the most common artifact types like blinks and saccades. | Eye tracking is useful to detect blinks, saccades, microsaccades and fixations during an experiment. Typically, the eye tracker software will itself mark the most common artifact typeslike blinks and saccades. |
| Line 11: | Line 13: |
| These artifact markers are of course useful for the analysis of EEG / MEG data, since we can then exclude specific periods, which are contominated with artifacts. To do so, we need to synchronize the eye tracker data with our EEG / MEG recordings. | These artifact markers are very useful for the analysis of EEG / MEG data, since specific time periods which are contominated with artifacts can be marked and excluded easily. To do so, we need to synchronize the eye tracker data with our EEG / MEG recordings. |
| Line 13: | Line 15: |
| This tutorial focusses on how to snychronize EyeLink data (.edf) within brainstorm with your raw data. | This tutorial focusses on how to snychronize EyeLink data (.edf) within brainstorm with raw data within brainstorm. |
| Line 15: | Line 17: |
| Information about the EyeLink can be found at ''http://www.sr-research.com/index.html.'' | Information about the '''EyeLink '''can be found at ''http://www.sr-research.com/index.html.'' |
| Line 18: | Line 20: |
| For this function to work, you need specific markers, which are stored within '''both''' EEG/MEG '''and''' eye tracker data '''at the same time.''' The exactly same amount of this marker type has to be available in both data sets. They can, however, have different names. | For this function to work, you need specific markers, which are stored within '''both''' EEG/MEG '''and''' eye tracker data '''at the same time.''' The exactly same number of this marker type has to be available in both data sets. They can, however, have different names. |
| Line 20: | Line 22: |
| == Procedure == ... |
== Data import == First of all, the raw recording has to be linked to your brainstorm database, if not already done ([[Review continuous recordings]]). The EyeLink .edf file can be linked the same as the EEG recordings: * Switch to the "functional data" view. <<BR>><<BR>> * Right-click on the subject folder > '''Review raw file''' * Select the file format: "'''EyeLink eye tracker (*.edf)'''" * Select the .edf file(s) * Click "open" * Due to the file format, the loading can take a while == Event transfer == Now click on the "Process2" tab. * Into "Files A", drag and drop the raw data files from which you want to copy the events (in this case, the EyeLink files) * Into "Files B", drag and drop the recordings into which you want to paste the events; here, the EEG recordings. It does not matter if the number of files in A and B is different. However, the number of sync markers within each data set has to match. |
| Line 28: | Line 49: |
| Line 32: | Line 51: |
Tutorial XX: Synchronization with Eyetracker data (event transfer)
Authors: Francois Tadel, Martin Völker
This tutorial introduces how to transfer events from one data set to a second data set of a different type, which was recorded at the same time.
We will explain this on the example of synchronizing ocular data recorded with an EyeLink eye tracker (SR Research, Canada) with a second raw recording, e.g. EEG.
Contents
Introduction
Eye tracking is useful to detect blinks, saccades, microsaccades and fixations during an experiment. Typically, the eye tracker software will itself mark the most common artifact typeslike blinks and saccades.
These artifact markers are very useful for the analysis of EEG / MEG data, since specific time periods which are contominated with artifacts can be marked and excluded easily. To do so, we need to synchronize the eye tracker data with our EEG / MEG recordings.
This tutorial focusses on how to snychronize EyeLink data (.edf) within brainstorm with raw data within brainstorm.
Information about the EyeLink can be found at http://www.sr-research.com/index.html.
Requirements
For this function to work, you need specific markers, which are stored within both EEG/MEG and eye tracker data at the same time. The exactly same number of this marker type has to be available in both data sets. They can, however, have different names.
Data import
First of all, the raw recording has to be linked to your brainstorm database, if not already done (?Review continuous recordings).
The EyeLink .edf file can be linked the same as the EEG recordings:
Switch to the "functional data" view.
Right-click on the subject folder > Review raw file
Select the file format: "EyeLink eye tracker (*.edf)"
- Select the .edf file(s)
- Click "open"
- Due to the file format, the loading can take a while
Event transfer
Now click on the "Process2" tab.
Into "Files A", drag and drop the raw data files from which you want to copy the events (in this case, the EyeLink files)
- Into "Files B", drag and drop the recordings into which you want to paste the events; here, the EEG recordings.
It does not matter if the number of files in A and B is different. However, the number of sync markers within each data set has to match.
Process options
...
Additional documentation
Forum: Development of eye tracker support http://neuroimage.usc.edu/forums/showthread.php?2193-Is-eye-tracker-data-support-interesting-to-Brainstorm