Eye Tracking: EEG Recording
Combining eye tracking and EEG can have several advantages. For certain EEG scenarios, eye movements (not just blinks) can introduce large artefacts into recordings, causing issues for subsequent analysis. In these scenarios it is important to have reliable eye tracking data in order to be able to discard relevant trials / portions of data. Eye tracking can also be used to limit what is shown to participants and when it is shown (for example only presenting targets when participants are fixating centrally, or making peripheral targets disappear if gaze leaves the central target. Eye Tracking can also provide useful secondary information concerning cognitive workload and engagement.
More recently, researchers have begun to explore concepts such as “fixation related potentials” in tasks including reading and visual search. In this workshop, we will discuss the range of scenarios in which combining eye tracking with EEG can be advantageous, and outline strategies for synchronisation and data co-registration. It is important that participants bring a laptop that has the latest versions of Experiment Builder / Data Viewer installed. Temporary Experiment Builder / Data Viewer software license keys will be provided for people who are not able to bring their own. For the last session, attendees will need Fieldtrip (a matlab toolbox) installed if they want to follow along.
Why Study?
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Learn how to record simulataneous EEG and eye tracking data
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Understand how to use TTL signalling to ensure common time points in both data streams
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Learn how to use Experiment Builder to interface with EGI EEG systems.
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Understand the basics of TTL signalling and synchronization
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Use Fieldtrip to co-register EEG and EyeLink data.
Schedule
09:00 - 09:30: Registration / Welcome
09:30 - 09:45: Introduction to eye tracking and EEG. This session will outline the key issues to be covered in the workshop, including TTL signalling and co-registration of EEG and eye tracking data, and describe some of the advantages of simultaneous eye tracking and EEG recording.
09:45 - 10:30: Set up and Calibration for EEG research. This practical session will cover setting up and calibrating participants using the EyeLink 1000 Plus, using head fixed and remote modes. The session will include advice on how to maximise and measure data quality.
10:30 - 11:00: Tea / Coffee Break
11:00 - 12:30: TTL signalling explained. Basic TTL synchronisation strategies explained, with detailed examples of equipment / cabling required for a range of EEG systems.
12:30 - 13:30: Lunch
13:30 - 15:00: Integrating EyeLink systems with EGI EEG systems using Experiment Builder.
15:00 – 15:30: Tea / Coffee Break
15:30 - 17:00: Co-registering EEG and EyeLink data using Fieldtrip (requires matlab / Fleldtrip software to be installed).