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Related Experiment Video

Updated: Aug 22, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Head Orientation Influences Saccade Directions during Free Viewing.

Stephanie M Reeves¹, Emily A Cooper^2,3, Raul Rodriguez²

¹Herbert Wertheim School of Optometry and Vision Science, University of California Berkeley, Berkeley, 94720, CA stephanie_reeves@berkeley.edu.

|November 9, 2022

Summary

This summary is machine-generated.

Head orientation influences human saccadic eye movements, with biases aligning with head tilt. This suggests vestibular input plays a role in directing gaze, even when viewing natural scenes.

Keywords:

direction bias eye movements head tilt saccades vestibular virtual reality

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Last Updated: Aug 22, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

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Published on: March 18, 2019

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Testing of all Six Semicircular Canals with Video Head Impulse Test Systems

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Published on: April 18, 2019

Area of Science:

Neuroscience
Ophthalmology
Human Physiology

Background:

Humans exhibit directional biases in saccadic eye movements, favoring horizontal and vertical directions.
The influence of head orientation on these saccade direction biases is not fully understood.

Purpose of the Study:

To investigate whether head orientation affects saccadic eye movement direction biases.
To determine the role of vestibular information in saccade generation.

Main Methods:

Participants (n=14) viewed images (natural scenes, fractals) via VR headset with eye tracking.
Head and image orientations were manipulated (-30°, 0°, 30°).
Saccade direction biases were analyzed using polar histograms and cross-correlation.

Main Results:

Saccade biases largely followed head orientation during fractal viewing (24° displacement).
A systematic 2.6° offset in saccade direction was observed, likely due to ocular counter roll.
Head orientation continued to influence saccade directions when viewing Earth-upright natural scenes.

Conclusions:

Head orientation significantly influences saccadic eye movement direction.
Nonvisual cues, such as vestibular input regarding head position, are likely critical for saccade generation.