Adaptation of scanning saccades co-occurs in different coordinate systems

Levy-Bencheton, Delphine, Pelisson, Denis, Panouilleres, Muriel, Urquizar, Christian, Tilikete, Caroline and Pisella, Laure (2014) Adaptation of scanning saccades co-occurs in different coordinate systems. Journal of Neurophysiology, 111 12: 2505-2515. doi:10.1152/jn.00733.2013

Author Levy-Bencheton, Delphine
Pelisson, Denis
Panouilleres, Muriel
Urquizar, Christian
Tilikete, Caroline
Pisella, Laure
Title Adaptation of scanning saccades co-occurs in different coordinate systems
Journal name Journal of Neurophysiology   Check publisher's open access policy
ISSN 1522-1598
Publication date 2014-06-15
Year available 2014
Sub-type Article (original research)
DOI 10.1152/jn.00733.2013
Open Access Status Not yet assessed
Volume 111
Issue 12
Start page 2505
End page 2515
Total pages 11
Place of publication Bethesda, MD, United States
Publisher American Physiological Society
Language eng
Abstract Plastic changes of saccades (i.e., following saccadic adaptation) do not transfer between oppositely directed saccades, except when multiple directions are trained simultaneously, suggesting a saccadic planning in retinotopic coordinates. Interestingly, a recent study in human healthy subjects revealed that after an adaptive increase of rightwardscanning saccades, both leftward and rightward double-step, memoryguided saccades, triggered toward the adapted endpoint, were modified, revealing that target location was coded in spatial coordinates (Zimmermann et al. 2011). However, as the computer screen provided a visual frame, one alternative hypothesis could be a coding in allocentric coordinates. Here, we questioned whether adaptive modifications of saccadic planning occur in multiple coordinate systems. We reproduced the paradigm of Zimmermann et al. (2011) using target light-emitting diodes in the dark, with and without a visual frame, and tested different saccades before and after adaptation. With double-step, memory-guided saccades, we reproduced the transfer of adaptation to leftward saccades with the visual frame but not without, suggesting that the coordinate system used for saccade planning, when the frame is visible, is allocentric rather than spatiotopic. With single-step, memory-guided saccades, adaptation transferred to leftward saccades, both with and without the visual frame, revealing a target localization in a coordinate system that is neither retinotopic nor allocentric. Finally, with single-step, visually guided saccades, the classical, unidirectional pattern of amplitude change was reproduced, revealing retinotopic coordinate coding. These experiments indicate that the same procedure of adaptation modifies saccadic planning in multiple coordinate systems in parallel- each of them revealed by the use of different saccade tasks in postadaptation.
Keyword Memory-guided saccades
Reference frame
Scanning saccades
Visually guided
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
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