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Hans A. Trukenbrod, Ralf Engbert; Eye movements in a sequential scanning task: Evidence for distributed processing. Journal of Vision 2012;12(1):5. doi: 10.1167/12.1.5.
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© ARVO (1962-2015); The Authors (2016-present)
Current models of eye movement control are derived from theories assuming serial processing of single items or from theories based on parallel processing of multiple items at a time. This issue has persisted because most investigated paradigms generated data compatible with both serial and parallel models. Here, we study eye movements in a sequential scanning task, where stimulus n indicates the position of the next stimulus n + 1. We investigate whether eye movements are controlled by sequential attention shifts when the task requires serial order of processing. Our measures of distributed processing in the form of parafoveal-on-foveal effects, long-range modulations of target selection, and skipping saccades provide evidence against models strictly based on serial attention shifts. We conclude that our results lend support to parallel processing as a strategy for eye movement control.
***p < 0.001, two-tailed t-test for paired samples.
aStandard errors (SEs) across subjects.
bNumber of observed events.
cNumber of participants with both forward saccades and skippings.
*p < 0.05; ***p < 0.001, two-tailed t-test for paired samples.
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