[Eeglablist] trialinfo, and "scan" a set file?

[Arnaud Delorme]

Dear Andrew,

this is done automatically. As long as the fields are present in your dataset even structure, they will be visible when you create a STUDY. Now a small caviat: only the values for the time-locking events are reflected in the STUDY (values of the fields for the events at time 0).

For instance, if you have recorded reaction time for each trial and would like to process them at the STUDY level (for instance, create designs that compares trials with fast reaction times with trials with slow reaction times), you will need to create a field name "reaction_time" (for instance - any other field name will do) in the event structure and place the value of the reaction time in it for all time locking events.

Best,

Arno

On Apr 15, 2011, at 1:50 AM, Andrew Hill wrote:

> I'm looking at the documentation on std_maketrialinfo in the wiki:
> 
> http://sccn.ucsd.edu/wiki/Chapter_07:EEGLAB_Study_Data_Structures#The_STUDY.changrp_sub-structure
> 
> and wondering how to "scan the set file to update scans the EEG.event structure for each dataset and add a relevant field for the time locking event (event at time 0) of each data trial".  my scripting fu isn't quite up to this.  i've got complex event codes in each epoch, andwould love to add several fields to each epoch for later use.  i'm assuming that by doing this, and then calculating channel measures including trial info, those variables will show up in the design variables for a Study.  
> 
> Best,
> Andrew
> 
> 
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