How to add and edit markers in BESA
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BESA Research is the most widely used software for source analysis and dipole localization in EEG, MEG, Evoked Potentials and ERP research.——from official website
How to use the besa software, you can see the articles.
https://7988888.xyz/besa/
《 BESA软件界面简介》
Today，I talk about how to add and edit markers in the software.
First of all, I need to say that this is the operation after the experiment collection.
For different parameter modification methods of marker in besa, please refer to the following:
Event Codes
The event code Code must be one of the following integers:
| Code | Event/Trigger Type |
|---|---|
| 1 | Trigger |
| 2 | Comment |
| 3 | Marker |
| 11 | Pattern1 |
| 12 | Pattern2 |
| 13 | Pattern3 |
| 14 | Pattern4 |
| 15 | Pattern5 |
| 21 | Artifact on |
| 22 | Artifact off |
| 31 | Epoch on |
| 32 | Epoch off |
| 41 | New segment |
| 42 | Average segment |
Here are a couple of typical examples:
1) Simple trigger file
| Tms | Code | TriNo | Comnt |
|---|---|---|---|
| 100.234 | 1 | 3 | Trigger: 3 |
| 2300.456 | 1 | 1 | Trigger:1 |
| 4500.21 | 1 | 1 | Trigger:1 |
| 9800.47 | 1 | 7 | Trigger:7 |
| 12500.78 | 1 | 2 | Trigger:2 |
| 21237 | 1 | 1 | Trigger:1 |
2) Trigger file with reaction code and reaction time
| Tms | Code | TriNo | RTsec | RCode |
|---|---|---|---|---|
| 100.234 | 1 | 3 | 0.23 | 1 |
| 2300.456 | 1 | 1 | 1.11 | 2 |
| 4500.21 | 1 | 1 | 0.15 | 1 |
| 9800.47 | 1 | 7 | 0.87 | 0 |
| 12500.78 | 1 | 2 | 2.1 | 2 |
| 21237 | 1 | 1 | 3 | 1 |
3) Event file without triggers
| Tmu | Code | Comnt |
|---|---|---|
| 10000.234 | 3 | Marker |
| 230000.456 | 12 | |
| 450000.21 | 14 | |
| 980000.47 | 12 | |
| 1250000.78 | 3 | Marker |
| 2123700 | 2 | Comment |
| 2534100.567 | 15 |
4) File including triggers and events
| Tms | Code | TriNo | RTsec | RCode | Comnt |
|---|---|---|---|---|---|
| 100.234 | 2 | 0 | 0 | 0 | CommentSet |
| 2300.456 | 1 | 2 | |||
| 4500.21 | 1 | 1 | 0.15 | 1 | |
| 9800.47 | 11 | ||||
| 12500.78 | 3 | ||||
| 21237 | 2 | 0 | 3 | 1 | Comment |
| 25341.567 | 15 |
5) New Segments
| Tms | Code | TriNo | Comnt |
|---|---|---|---|
| 0 | 41 | 2010-04-26T15:30:20.31 | Start recording |
| 21000 | 41 | 2010-04-27T09:17:00.0 | Next day |
The new segment at the time 0 overrides the start time in the file. A second segment at 21 s starts a new data block one day later at 9:17.
6) Average Segments
| Tms | Code | TriNo | Comnt |
|---|---|---|---|
| 0 | 42 | 100000 | Cond 1: 25 avs |
| 1100 | 42 | 200000 | Cond 2: 201 avs |
The file contains two average segments. The first, with a prestimulus interval of 100 ms, has a duration of 1100 ms. The second, with a prestimulus interval of 200 ms, has a length up to the end of the data file.
Reference website：
http://wiki.besa.de/index.php?title=Event_File_Format
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本文作者：陈锐
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