This video tutorial explains how action and trigger nodes connect to one another in order to make experimental events occur in the proper manner, and how messages can be used to mark the occurrence of these experimental events in the Eye tracking Data File.
Links:
Data Viewer Video Tutorial: 03 Interest Periods
https://www.youtube.com/watch?v=4TcppDOm330
00:00 - Editing a Display Screen Action Node
01:07 - Keyboard and Timer Trigger Nodes
02:05 - Adding Messages to Log Action and Trigger Nodes
03:00 - Using Messages to Set Interest Period in Data Viewer
