Getting Started: Getting Started with EGI Integration
Connecting up the Equipment

Integration between EGI and EyeLink systems can be achieved via TCP / IP (using Experiment Builder or E-Prime with NetStation Extension) or via standard TTL signalling (using a trigger cable supplied by EGI).


Integration via Experiment Builder

Detailed instructions for Experiment Builder users can be found in the .pdf document which accompanies the EGI Example Templates provided in Experiment Builder 2.2 and above. The templates and PDF documents are linked below:

.pdf   NetStation_EyeLink_Simple.pdf (Size: 1.85 MB / Downloads: 52)

.pdf   NetStation_NonEyeLink_Stroop.pdf (Size: 1.82 MB / Downloads: 10)

Integration via other Stimulus Presentation Software

People using E-Prime and the NetStation Extension should consult PST / the relevant manuals for guidance.
For MATLAB+Psychtoolbox, NBS Presentation, PsychoPy, OpenSesame and other stimulus presentation software, synchronization can be via TCP/IP (where possible) or TTL signaling.

An introduction to TTL signaling outlines the basics of TTL signaling. 

Users can mark critical trial events by simultaneously sending a TTL to the EEG equipment (typically via the parallel port of the Display PC) and writing a message to the EyeLink data. Alternatively, if you have a Desktop Host PC with a parallel port, a DB25 Splitter cable can be used to send the TTL to both the EEG equipment and the Host PC.

Offline synchronization in EEGLab and Fieldtrip

For post-hoc synchronization in software such as EEG-LAB and Fieldtrip, it can be useful to ensure that the message sent to the EyeLink ends with the same 0-255 value that was sent as the TTL.