Related Experiment Video
Updated: Feb 28, 2026
Eye Tracking During Visually Situated Language Comprehension: Flexibility and Limitations in Uncovering Visual Context Effects
Published on: November 30, 2018
Subtle eye movement metrics reveal task-relevant representations prior to visual search
Anouk M van Loon1, Katya Olmos-Solis2, Christian N L Olivers1
1Department of Experimental and Applied Psychology, Vrije Universiteit Amsterdam, Amsterdam, The NetherlandsInstitute of Brain and Behavior Amsterdam, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
Subtle eye movements, specifically microsaccades, can reveal the active visual working memory (VWM) search template before a visual search begins. These eye movements distinguish between currently relevant, future, and outdated VWM information.
Area of Science:
- Cognitive Neuroscience
- Visual Perception
- Ophthalmology
Background:
- Visual search relies on a visual working memory (VWM) representation, termed the search template, to guide attention.
- Understanding how the brain activates and maintains these search templates is crucial for explaining selective attention.
Purpose of the Study:
- To investigate how eye movement metrics can indicate the activated search template in VWM before visual search.
- To differentiate between currently relevant, future, and irrelevant VWM content using eye movement patterns.
Main Methods:
- Three experiments employed a probe technique where participants fixated centrally while task-irrelevant colored probes were presented.
- Eye movement metrics, particularly microsaccades, were analyzed in response to probes matching the memorized target color.
- Retro-cue and sequential task paradigms were used to manipulate and assess VWM content relevance.
Main Results:
- Participants exhibited increased and larger eye movements towards probes matching the target color, predominantly in microsaccades occurring 100-250 ms post-stimulus.
- Eye movement metrics successfully distinguished between relevant and irrelevant VWM representations (Experiment 2).
- The same metrics also differentiated between current and prospective search templates (Experiment 3).
Conclusions:
- Subtle eye movements, specifically microsaccades, serve as reliable indicators of active VWM search templates prior to visual search.
- These findings demonstrate a non-invasive method to track the dynamics of VWM content relevant for selective attention.
