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No evidence for a saccadic range effect for visually guided and memory-guided saccades in simple saccade-targeting tasks

  • Saccades to single targets in peripheral vision are typically characterized by an undershoot bias. Putting this bias to a test, Kapoula [1] used a paradigm in which observers were presented with two different sets of target eccentricities that partially overlapped each other. Her data were suggestive of a saccadic range effect (SRE): There was a tendency for saccades to overshoot close targets and undershoot far targets in a block, suggesting that there was a response bias towards the center of eccentricities in a given block. Our Experiment 1 was a close replication of the original study by Kapoula [1]. In addition, we tested whether the SRE is sensitive to top-down requirements associated with the task, and we also varied the target presentation duration. In Experiments 1 and 2, we expected to replicate the SRE for a visual discrimination task. The simple visual saccade-targeting task in Experiment 3, entailing minimal top-down influence, was expected to elicit a weaker SRE. Voluntary saccades to remembered target locations inSaccades to single targets in peripheral vision are typically characterized by an undershoot bias. Putting this bias to a test, Kapoula [1] used a paradigm in which observers were presented with two different sets of target eccentricities that partially overlapped each other. Her data were suggestive of a saccadic range effect (SRE): There was a tendency for saccades to overshoot close targets and undershoot far targets in a block, suggesting that there was a response bias towards the center of eccentricities in a given block. Our Experiment 1 was a close replication of the original study by Kapoula [1]. In addition, we tested whether the SRE is sensitive to top-down requirements associated with the task, and we also varied the target presentation duration. In Experiments 1 and 2, we expected to replicate the SRE for a visual discrimination task. The simple visual saccade-targeting task in Experiment 3, entailing minimal top-down influence, was expected to elicit a weaker SRE. Voluntary saccades to remembered target locations in Experiment 3 were expected to elicit the strongest SRE. Contrary to these predictions, we did not observe a SRE in any of the tasks. Our findings complement the results reported by Gillen et al. [2] who failed to find the effect in a saccade-targeting task with a very brief target presentation. Together, these results suggest that unlike arm movements, saccadic eye movements are not biased towards making saccades of a constant, optimal amplitude for the task.show moreshow less

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Metadaten
Author:Antje NuthmannORCiD, Françoise Vitu, Ralf EngbertORCiDGND, Reinhold KlieglORCiDGND
URN:urn:nbn:de:kobv:517-opus4-411639
DOI:https://doi.org/10.25932/publishup-41163
ISSN:1866-8364
Parent Title (English):Postprints der Universität Potsdam : Humanwissenschaftliche Reihe
Series (Serial Number):Postprints der Universität Potsdam : Humanwissenschaftliche Reihe (506)
Document Type:Postprint
Language:English
Date of first Publication:2019/01/23
Year of Completion:2015
Publishing Institution:Universität Potsdam
Release Date:2019/01/23
Tag:Z-reader model; accuracy; eccentricity; eye-movement control; microsaccades; oculomotor control; psychophysics toolbox; scleral search coils; tracking; video-oculography
Issue:506
Pagenumber:27
Source:PLoS ONE 11 (2016) 9 Art. e0162449. DOI 10.1371/journal.pone.0162449
Organizational units:Humanwissenschaftliche Fakultät
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit
Peer Review:Referiert
Publication Way:Open Access
Grantor:Public Library of Science (PLOS)
Licence (German):License LogoCreative Commons - Namensnennung, 4.0 International