Fixational eye movements during viewing of dynamic natural scenes

Roberts, James A., Wallis, Guy and Breakspear, Michael (2013) Fixational eye movements during viewing of dynamic natural scenes. Frontiers in Psychology, 4 OCT: 797.1-797.12. doi:10.3389/fpsyg.2013.00797

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Author Roberts, James A.
Wallis, Guy
Breakspear, Michael
Title Fixational eye movements during viewing of dynamic natural scenes
Journal name Frontiers in Psychology   Check publisher's open access policy
ISSN 1664-1078
Publication date 2013-10
Sub-type Article (original research)
DOI 10.3389/fpsyg.2013.00797
Open Access Status DOI
Volume 4
Issue OCT
Start page 797.1
End page 797.12
Total pages 12
Place of publication Lausanne, Switzerland
Publisher Frontiers Research Foundation
Collection year 2014
Language eng
Abstract Even during periods of fixation our eyes undergo small amplitude movements. These movements are thought to be essential to the visual system because neural responses rapidly fade when images are stabilized on the retina. The considerable recent interest in fixational eye movements (FEMs) has thus far concentrated on idealized experimental conditions with artificial stimuli and restrained head movements, which are not necessarily a suitable model for natural vision. Natural dynamic stimuli, such as movies, offer the potential to move beyond restrictive experimental settings to probe the visual system with greater ecological validity. Here, we study FEMs recorded in humans during the unconstrained viewing of a dynamic and realistic visual environment, revealing that drift trajectories exhibit the properties of a random walk with memory. Drifts are correlated at short time scales such that the gaze position diverges from the initial fixation more quickly than would be expected for an uncorrelated random walk. We propose a simple model based on the premise that the eye tends to avoid retracing its recent steps to prevent photoreceptor adaptation. The model reproduces key features of the observed dynamics and enables estimation of parameters from data. Our findings show that FEM correlations thought to prevent perceptual fading exist even in highly dynamic real-world conditions.
Keyword Fixational eye movement
Drift
Batural vision
Random walk
Anomalous diffusion
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Brain Institute Publications
Official 2014 Collection
School of Human Movement and Nutrition Sciences Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 6 times in Scopus Article | Citations
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