Task-switching in oculomotor control: unidirectional switch-cost when alternating between pro- and antisaccades.

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  • Author(s): Weiler J;Weiler J; Heath M
  • Source:
    Neuroscience letters [Neurosci Lett] 2012 Nov 21; Vol. 530 (2), pp. 150-4. Date of Electronic Publication: 2012 Oct 12.
  • Publication Type:
    Journal Article; Research Support, Non-U.S. Gov't
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Elsevier Scientific Publishers Ireland Country of Publication: Ireland NLM ID: 7600130 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1872-7972 (Electronic) Linking ISSN: 03043940 NLM ISO Abbreviation: Neurosci Lett Subsets: MEDLINE
    • Publication Information:
      Publication: Limerick : Elsevier Scientific Publishers Ireland
      Original Publication: Amsterdam, Elsevier/North-Holland.
    • Subject Terms:
      Task Performance and Analysis*; Feedback, Physiological/*physiology ; Nerve Net/*physiology ; Neural Inhibition/*physiology ; Oculomotor Muscles/*physiology ; Reflex/*physiology ; Saccades/*physiology; Adolescent ; Adult ; Female ; Humans ; Male ; Young Adult
    • Abstract:
      The antisaccade task requires the suppression of a reflexive prosaccade (i.e., response suppression) and the remapping of a target location to mirror-symmetrical space (i.e., vector inversion). Moreover, antisaccades are associated with increased activation of cortical oculomotor networks: a finding attributed to the top-down requirements of response suppression and vector inversion. The goal of the present study was to determine if the increased cortical activity associated with antisaccades elicits a residual inhibition of oculomotor planning networks. To that end, each trial in this investigation entailed the onset of a single and exogenously presented target (i.e., archetypical antisaccade task) and participants were instructed to alternate between pro- and antisaccades in blocked and random task-switching schedules. In the blocked schedule, the saccade tasks (i.e., pro- and antisaccades) alternated on every second trial (AABB paradigm) whereas in the random schedule the saccade tasks were pseudo-randomly interleaved on a trial-by-trial basis. Reaction times for task-switch prosaccades were longer and more variable than their task-repetition counterparts, whereas antisaccades did not vary as a function of task-switch and task-repetition trials: a finding that was consistent across blocked and random presentation schedules. In other words, results demonstrate a unidirectional switch-cost for prosaccades. As such, we propose that the top-down processes required to complete an antisaccade results in residual inhibition of oculomotor networks supporting a subsequent prosaccade.
      (Copyright © 2012 Elsevier Ireland Ltd. All rights reserved.)
    • Publication Date:
      Date Created: 20121016 Date Completed: 20130509 Latest Revision: 20220317
    • Publication Date:
      20231215
    • Accession Number:
      10.1016/j.neulet.2012.10.007
    • Accession Number:
      23063688