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Related Experiment Video

Updated: Jun 16, 2026

Eye Tracking Young Children with Autism

Eye Tracking Young Children with Autism

Published on: March 27, 2012

An adaptive algorithm for fixation, saccade, and glissade detection in eyetracking data.

Marcus Nyström¹, Kenneth Holmqvist

¹Humanities Lab, Lund University, Lund, Sweden. marcus.nystrom@humlab.lu.se

Behavior Research Methods

|February 18, 2010

Summary

This summary is machine-generated.

A new velocity-based algorithm robustly identifies eye movement events, including newly classified glissades. This improves upon current methods, offering researchers a crucial choice in analyzing saccades and fixations.

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Area of Science:

Ophthalmology
Neuroscience
Computer Science

Background:

Current eye movement event detection algorithms have significant flaws and lack a standardized approach.
Existing methods fail to accurately classify subtle eye movements like glissades.

Purpose of the Study:

To introduce a novel velocity-based algorithm for more accurate eye movement event detection.
To incorporate the identification and classification of glissades as a distinct eye movement category.

Main Methods:

Developed a new velocity-based algorithm with an adaptive velocity threshold.
Implemented an algorithm that is settings-free and less sensitive to noise variations.
Compared the new algorithm's performance against two commonly used algorithms during reading and scene perception tasks.

Main Results:

The new algorithm robustly identifies fixations, saccades, and glissades, unlike current methods.
Glissades were identified in approximately 50% of saccades during reading and scene perception.
Glissades have an average duration of 24 milliseconds.

Conclusions:

The high prevalence and duration of glissades necessitate researchers actively choosing their classification (saccade or fixation).
Current algorithms provide arbitrary glissade assignments, significantly impacting dependent variables.
The proposed algorithm offers a more accurate and nuanced approach to eye movement analysis.