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Experimental Brain Research

, Volume 155, Issue 2, pp 231–244 | Cite as

When pros become cons for anti- versus prosaccades: factors with opposite or common effects on different saccade types

  • Árni KristjánssonEmail author
  • Myriam W. G. Vandenbroucke
  • Jon Driver
Research Article

Abstract

In five experiments we compared prosaccade and antisaccade performance in normal human observers. This was first examined for visual stimulation in temporal or nasal hemifields, under monocular viewing. Prosaccades were faster following temporal than nasal stimulation, in accordance with previous results. The novel finding was that the opposite pattern was observed for antisaccades, consistent with a difficulty in overcoming a stronger prosaccade tendency after temporal-hemifield stimulation. A second experiment showed that these results were not simply due to antisaccades following nasal stimulation benefitting from being made towards a temporal place-holder. Prosaccades and antisaccades were then compared for visual versus somatosensory stimulation. The substantial latency difference between prosaccades and antisaccades for visual stimuli was eliminated for somatosensory stimuli. Antisaccades can thus benefit in relative terms when the competing prosaccadic tendency is weakened; but two further experiments revealed that not all manipulations induce opposing outcomes for the two types of saccade. Although reducing the contrast of visual targets can slow prosaccades and conversely speed antisaccades, this was not the case at the lowest contrast level used, where both types of saccade were slowed, thus indicating some common limiting source. Moreover, warning sounds presented shortly before a visual target speeded both prosaccades and antisaccades. These results illustrate that several factors which slow prosaccades can speed antisaccades (consistent with competition between different pathways); but also reveal some notable exceptions, where both types of saccade are slowed or speeded together, suggesting some common pathways that may precede competition over the direction of the saccade.

Keywords

Saccades Antisaccades Spatial attention Visuomotor control Crossmodal integration 

Notes

Acknowledgements

A.K. was supported by a Long Term Fellowship from the Human Frontiers Science Program (Number LT00126/2002-C/2). J.D. was supported by programme grants from the Medical Research Council (UK) and the Wellcome Trust. Thanks are due to Francesco Pavani, Angelo Maravita, Chris Rorden and Steffan Kennett for technical help.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Árni Kristjánsson
    • 1
    Email author
  • Myriam W. G. Vandenbroucke
    • 1
  • Jon Driver
    • 1
  1. 1.Institute of Cognitive NeuroscienceUniversity College LondonLondonUK

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