Template: Using MRI Sync Pulses (TTL) to Trigger Stimulus Onset

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Using MRI Sync Pulses (TTL) to Trigger Stimulus Onset

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

This example illustrates:

• Use of TTL node to communicate with the MRI Sync Pulse.
  
• How to set up an Inter-Trial Interval to wait for the next MRI Sync Pulse.
  

Description:

This example illustrates how to use TTL sync pulses from an MRI to trigger stimulus onset. 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 to accept a TTL pulse from the tracker. By setting a constant time between trial onsets, this experiment ensures that each trial spans the same number of MRI scanner TRs.

**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 Integrating EyeLink and EEG / MRI with Experiment Builder Webinar for more details.

Instructions:

1. Download the MRI_example_TTL_sync.ebz example from this message.
   
2. Launch the Experiment Builder application.
   
3. Unpack the MRI_example_TTL_sync.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 MRI_example_TTL_sync.exe from the deployed directory.
   

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  MRI_example_TTL_sync.ebz (Size: 400.58 KB / Downloads: 30)

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