EyeLink-Magstim-EGI Integration

Experiment Builder and NetStation 2.0 Integration

EGI Systems can be controlled and directly integrated with EyeLink eye trackers using Version 2.2 of our stimulus presentation software Experiment Builder. Automatic online clock synchronization and clock drift correction is performed using the NTP timing protocol, so that the events recorded in Experiment Builder are synchronized with the EEG data collected by EGI’s amplifiers.

Dedicated Experiment Builder nodes allow users to:

• Control opening / closing Net Station connections and recording sessions
• Start and stop recordings
• Mark the beginning and end of the trial and send trial condition variables to Net Station
• Send event markers (e.g. stimulus / response onsets) online to Net Station
• Access the eye data online and send the event data online to the EEG systems
• Optionally send TTL signals during experiment runtime

EyeLink and Magstim-EGI Integration Detail

• Integration via Experiment Builder, E-Prime and Matlab can be achieved via the EGI Experiment Control Interface (ECI) which uses TCP/IP to control Net Station recording operations and to send event information to Net Station.
• All three computers are connected to a network switch and timing is synchronized using the NTP timing protocol
• For researchers who use other stimulus presentation software (such as NBS Presentation / PsychoPy etc) EGI systems can be integrated with EyeLink systems using Standard TTL signalling and a trigger cable supplied by Magstim-EGI.
• The TTL signals can either be sent from the parallel port of the Display PC or Host PC. If neither computer has a parallel port then a device such as the USB2TTL8 can be used.