Lévy-like diffusion in eye movements during spoken-language comprehension

DG Stephen, D Mirman, JS Magnuson, JA Dixon - Physical Review E …, 2009 - APS
Physical Review E—Statistical, Nonlinear, and Soft Matter Physics, 2009APS
This study explores the diffusive properties of human eye movements during a language
comprehension task. In this task, adults are given auditory instructions to locate named
objects on a computer screen. Although it has been convention to model visual search as
standard Brownian diffusion, we find evidence that eye movements are hyperdiffusive.
Specifically, we use comparisons of maximum-likelihood fit as well as standard deviation
analysis and diffusion entropy analysis to show that visual search during language …
This study explores the diffusive properties of human eye movements during a language comprehension task. In this task, adults are given auditory instructions to locate named objects on a computer screen. Although it has been convention to model visual search as standard Brownian diffusion, we find evidence that eye movements are hyperdiffusive. Specifically, we use comparisons of maximum-likelihood fit as well as standard deviation analysis and diffusion entropy analysis to show that visual search during language comprehension exhibits Lévy-like rather than Gaussian diffusion.
American Physical Society
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