Eye trackers add substantial power to your lab set-up. Combine them with physiology such as EEG, skin conductance, and more.
Eye tracking - Wikipedia
What is eye tracking? - Pupil Labs
PPT - Eye Tracking Techniques and applications PowerPoint Presentation - ID:3292365
Pupillometry: The Eye as a Window Into the Mind - Online Course - FutureLearn
Sensors, Free Full-Text
A laser emitting contact lens for eye tracking
Eye tracking & Physiology
What is eye tracking? - Pupil Labs
Magnetic eye tracking in mice
The easy to use but powerful Eye Tracking System
PDF] Expertise Differences in the Comprehension of Visualizations: a Meta-Analysis of Eye-Tracking
Integrating Eye Tracking Data with Physiological Measurements
Error-Aware Gaze-Based Interfaces for Robust Mobile Gaze Interaction – DFKI – Interactive Machine Learning Lab