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Fixation positions after skipping saccades: A single space makes a large difference

Abstract : During reading, saccadic eye movements are generated to shift words into the center of the visual field for lexical processing. Recently, Krugel and Engbert (Vision Research 50:1532-1539, 2010) demonstrated that within-word fixation positions are largely shifted to the left after skipped words. However, explanations of the origin of this effect cannot be drawn from normal reading data alone. Here we show that the large effect of skipped words on the distribution of within-word fixation positions is primarily based on rather subtle differences in the low-level visual information acquired before saccades. Using arrangements of ``x'' letter strings, we reproduced the effect of skipped character strings in a highly controlled single-saccade task. Our results demonstrate that the effect of skipped words in reading is the signature of a general visuomotor phenomenon. Moreover, our findings extend beyond the scope of the widely accepted range-error model, which posits that within-word fixation positions in reading depend solely on the distances of target words. We expect that our results will provide critical boundary conditions for the development of visuomotor models of saccade planning during reading.
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https://hal.archives-ouvertes.fr/hal-01439719
Contributor : Jean-Baptiste Melmi Connect in order to contact the contributor
Submitted on : Wednesday, January 18, 2017 - 5:07:38 PM
Last modification on : Tuesday, October 19, 2021 - 10:58:52 PM

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Andre Kruegel, Françoise Vitu, Ralf Engbert. Fixation positions after skipping saccades: A single space makes a large difference. Attention, Perception, and Psychophysics, Springer Verlag, 2012, 74 (8), pp.1556-1561. ⟨10.3758/s13414-012-0365-1⟩. ⟨hal-01439719⟩

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