Interdependence of saccadic and fixational fluctuations

Sebastian Wallot, Charles A. Coey, Michael J. Richardson

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Recent research suggests that the different components of eye movements (fixations, saccades) are not strictly separate but are interdependent processes. This argument rests on observations that gaze-step sizes yield unimodal distributions and exhibit power-law scaling, indicative of interdependent processes coordinated across timescales. The studies that produced these findings, however, employed complex tasks (visual search, scene perception). Thus, the question is whether the observed interdependence is a fundamental property of eye movements or emerges in the interplay between cognitive processes and complex visual stimuli. In this study, we used a simple eye movement task where participants moved their eyes in a prescribed sequence at several different paces. We outlined diverging predictions for this task for independence versus interdependence of fixational and saccadic fluctuations and tested these predictions by assessing the spectral properties of eye movements. We found no clear peak in the power spectrum attributable exclusively to saccadic fluctuations. Furthermore, changing the pace of the eye movement sequence yielded a global shift in scaling relations evident in the power spectrum, not just a localized shift for saccadic fluctuations. These results support the conclusion that fixations and saccades are interdependent processes.
LanguageEnglish
Pages68-86
Number of pages19
JournalEcological Psychology
Volume27
Issue number1
DOIs
Publication statusPublished - 2015
Externally publishedYes

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Eye movements
Eye Movements
eyes
Saccades
fixation
Power spectrum
prediction
visual cue
Scaling laws
cognition
power law
timescale
Research

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Wallot, Sebastian ; Coey, Charles A. ; Richardson, Michael J. / Interdependence of saccadic and fixational fluctuations. In: Ecological Psychology. 2015 ; Vol. 27, No. 1. pp. 68-86.
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Interdependence of saccadic and fixational fluctuations. / Wallot, Sebastian; Coey, Charles A.; Richardson, Michael J.

In: Ecological Psychology, Vol. 27, No. 1, 2015, p. 68-86.

Research output: Contribution to journalArticleResearchpeer-review

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