Contralateral delay activity and alpha lateralization reflect retinotopic and screen-centered reference frames in visual memory.

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    • Source:
      Publisher: Pergamon Press Country of Publication: England NLM ID: 0370121 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-5118 (Electronic) Linking ISSN: 03010082 NLM ISO Abbreviation: Prog Neurobiol Subsets: MEDLINE
    • Publication Information:
      Publication: Oxford : Pergamon Press
      Original Publication: Oxford, New York, Pergamon Press.
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    • Abstract:
      The visual system represents objects in a lateralized manner, with contralateral cortical hemispheres responsible for left and right visual hemifields. This organization extends to visual short-term memory (VSTM), as evidenced by electrophysiological indices of VSTM maintenance: contralateral delay activity (CDA) and alpha-band lateralization. However, it remains unclear if VSTM represents object locations in gaze-centered (retinotopic) or screen-centered (spatiotopic) coordinates, especially after eye movements. In two experiments, participants encoded the colors of target objects and made a lateral saccade during the maintenance interval, thereby shifting the object's location on the retina. A non-lateralized probe stimulus was then presented at the new fixation for a change detection task. The CDA maintained lateralization towards the target's original retinotopic location, unaffected by subsequent saccades, and did not invert polarity even when a saccade brought that location into the opposite hemifield. We also found conventional alpha lateralization towards the target's location before a saccade. After a saccade, however, alpha was lateralized towards the screen center regardless of the target's original location, even in a control condition without any memory requirements. This suggests that post-saccadic alpha-band lateralization reflects attentional processes unrelated to memory, while pre- and post-saccade CDA reflect VSTM maintenance in a retinotopic reference frame.
      Competing Interests: Declaration of Competing Interest The authors report no competing interests.
      (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
    • Contributed Indexing:
      Keywords: Capacity; EEG; Eye movements; Remapping; Visual short-term memory
    • Publication Date:
      Date Created: 20240203 Date Completed: 20240325 Latest Revision: 20240325
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