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A theoretical analysis of the perceptual span based on SWIFT simulations of the n+2 boundary paradigm

  • Eye-movement experiments suggest that the perceptual span during reading is larger than the fixated word, asymmetric around the fixation position, and shrinks in size contingent on the foveal processing load. We used the SWIFT model of eye-movement control during reading to test these hypotheses and their implications under the assumption of graded parallel processing of all words inside the perceptual span. Specifically, we simulated reading in the boundary paradigm and analysed the effects of denying the model to have valid preview of a parafoveal word n + 2 two words to the right of fixation. Optimizing the model parameters for the valid preview condition only, we obtained span parameters with remarkably realistic estimates conforming to the empirical findings on the size of the perceptual span. More importantly, the SWIFT model generated parafoveal processing up to word n + 2 without fitting the model to such preview effects. Our results suggest that asymmetry and dynamic modulation are plausible properties of the perceptual spanEye-movement experiments suggest that the perceptual span during reading is larger than the fixated word, asymmetric around the fixation position, and shrinks in size contingent on the foveal processing load. We used the SWIFT model of eye-movement control during reading to test these hypotheses and their implications under the assumption of graded parallel processing of all words inside the perceptual span. Specifically, we simulated reading in the boundary paradigm and analysed the effects of denying the model to have valid preview of a parafoveal word n + 2 two words to the right of fixation. Optimizing the model parameters for the valid preview condition only, we obtained span parameters with remarkably realistic estimates conforming to the empirical findings on the size of the perceptual span. More importantly, the SWIFT model generated parafoveal processing up to word n + 2 without fitting the model to such preview effects. Our results suggest that asymmetry and dynamic modulation are plausible properties of the perceptual span in a parallel word-processing model such as SWIFT. Moreover, they seem to guide the flexible distribution of processing resources during reading between foveal and parafoveal words.show moreshow less

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Metadaten
Author:Sarah Risse, Sven Hohenstein, Reinhold KlieglORCiDGND, Ralf EngbertORCiDGND
DOI:https://doi.org/10.1080/13506285.2014.881444
ISSN:1350-6285 (print)
ISSN:1464-0716 (online)
Parent Title (English):Visual cognition
Publisher:Routledge, Taylor & Francis Group
Place of publication:Abingdon
Document Type:Article
Language:English
Year of first Publication:2014
Year of Completion:2014
Release Date:2017/03/27
Tag:Computational modelling; Eye movements; Perceptual span; Preview; Reading
Volume:22
Issue:3-4
Pagenumber:26
First Page:283
Last Page:308
Organizational units:Humanwissenschaftliche Fakultät / Institut für Psychologie
Peer Review:Referiert