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    Fine-grained, local maps and coarse, global representations support human spatial working memory

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    Author
    Katshu, Mohammad Z.
    Keyword
    Memory
    Date
    2014
    
    Metadata
    Show full item record
    DOI
    10.1371/journal.pone.0107969
    Publisher's URL
    http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0107969
    Abstract
    While sensory processes are tuned to particular features, such as an object's specific location, color or orientation, visual working memory (vWM) is assumed to store information using representations, which generalize over a feature dimension. Additionally, current vWM models presume that different features or objects are stored independently. On the other hand, configurational effects, when observed, are supposed to mainly reflect encoding strategies. We show that the location of the target, relative to the display center and boundaries, and overall memory load influenced recall precision, indicating that, like sensory processes, capacity limited vWM resources are spatially tuned. When recalling one of three memory items the target distance from the display center was overestimated, similar to the error when only one item was memorized, but its distance from the memory items' average position was underestimated, showing that not only individual memory items' position, but also the global configuration of the memory array may be stored. Finally, presenting the non-target items at recall, consequently providing landmarks and configurational information, improved precision and accuracy of target recall. Similarly, when the non-target items were translated at recall, relative to their position in the initial display, a parallel displacement of the recalled target was observed. These findings suggest that fine-grained spatial information in vWM is represented in local maps whose resolution varies with distance from landmarks, such as the display center, while coarse representations are used to store the memory array configuration. Both these representations are updated at the time of recall.
    Citation
    Katshu, M. Z. & d'Avossa, G. (2014). Fine-grained, local maps and coarse, global representations support human spatial working memory. PLoS ONE, 9 (9), pp.e107969.
    Type
    Article
    URI
    http://hdl.handle.net/20.500.12904/6136
    Note
    © 2014 Katshu, d'Avossa. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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