Template: Setting a Fixed Inter-Trial Interval
Setting a Fixed Inter-Trial Interval in Experiment Builder

Required Experiment Builder Version: 1.10.165 or higher
EyeLink Required: Yes
Type: Complete Example
Difficulty Level: Easy

This example illustrates:
  • How to use basic Conditional node and Timer trigger
  • How to use Variable to store the end time of the previous trial

This example illustrates how to set a fixed Inter-Trial Interval (ITI) in Experiment Builder. The project uses a variable to record the onset time of the previous trial, then uses a Timer trigger to wait a fixed time from the previous trial's onset value. In this way, the onset time of each trial is time-locked at a constant value to the end of the previous trial.

**Additional detailed information about the project is given in the notes section for most nodes. To see notes for a given node, either mouse over that node or click on it to display the notes window. If the notes window is not visible, go to the "View" drop down menu in Experiment Builder, select "Properties", and check "Note".

NOTE: Please see our Timing Control in Experiment Builder Webinar for more details of Timing Control.

  1. Download the ITI_Example.ebz example.
  2. Launch the Experiment Builder application.
  3. Unpack the ITI_Example.ebz file to a location on your Experiment Builder PC with "File menu -> Unpack".
  4. Open the project in Experiment Builder.
  5. Deploy the project to a new folder.
  6. Run the ITI_Example.exe from the deployed directory.

.ebz   ITI_Example.ebz (Size: 399.17 KB / Downloads: 24)