Difference between revisions of "Export Single Trial Data"

Revision as of 15:32, 7 March 2016

This article describes how to export single-trial EEG or MEG raw data for further analysis in an external program, e.g. in Matlab.

The data are then displayed in the review window. Now you can either

use the ERP module to define a condition and reject any trials with artifacts (see the BESA Help section on ERP for more information), or
directly move to the export of all epochs around a particular trigger.

Select "File -> Export...". The export dialog opens:

Figure 1 "Export data" dialog

Make sure that the options "Epochs around triggers" and "Original data" are selected. In the section "Target formats", choose the option of choice:

If you want to create ASCII files for offline analysis, select "ASCII multiplexed" or "ASCII vectorized"
If you want to analyze data directly in Matlab, select "Send to MATLAB"

For the "Interval..." select a long enough time span as shown in figure 2:

Figure 2 "Epoch around trigger" dialog

Then click the "Triggers..." button to select which trigger code or condition will be used.

@@ Line 10: / Line 10: @@
 Select "''File -> Export...''". The export dialog opens:
-[[File:Export_epochs_1.png|thumb|670px|Figure 1 "Export data"-dialog]]
+[[File:Export_epochs_1.png|thumb|500px|Figure 1 "Export data" dialog]]
 Make sure that the options "Epochs around triggers" and "Original data" are selected. In the section "Target formats", choose the option of choice:
@@ Line 16: / Line 16: @@
 * If you want to analyze data directly in Matlab, select "Send to MATLAB"
-For the "Interval..." select a long enough time span:
+For the "''Interval...''" select a long enough time span as shown in figure 2:
+[[File:Export_epochs_2.png|thumb|213px|Figure 2 "Epoch around trigger" dialog]]
+Then click the "''Triggers...''" button to select which trigger code or condition will be used.