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      Eye movement-related confounds in neural decoding of visual working memory representations

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      Creators
      Mostert, P.
      Albers, A.M.
      Todorova, L.
      Kok, P.
      Lange, F.P. de
      Date of Archiving
      2018
      Archive
      Radboud Data Repository
      Data archive handle
      https://hdl.handle.net/11633/di.dccn.DSC_3018016.04_526
      Publication type
      Dataset
      Access level
      Restricted access
      Please use this identifier to cite or link to this item: https://hdl.handle.net/2066/203795   https://hdl.handle.net/2066/203795
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      Organization
      PI Group Predictive Brain
      SW OZ DCC CO
      Audience(s)
      Life sciences
      Languages used
      English
      Key words
      neuroimaging
      Abstract
      A relatively new analysis technique, known as neural decoding or multivariate pattern analysis, has become increasingly popular for cognitive neuroimaging studies over recent years. These techniques promise to uncover the representational contents of neural signals, as well as the underlying code and the dynamic profile thereof. A field in which these techniques have led to novel insights in particular is that of visual working memory (VWM). In the present study we subjected human volunteers to a combined VWM/imagery task while recording their neural signals using MEG. We applied multivariate decoding analyses to uncover the temporal profile underlying the neural representations of the memorized item. Analysis of gaze position however revealed that our results were contaminated by systematic eye movements, suggesting that the MEG decoding results from our originally planned analyses were confounded. In addition to the eye movement analyses, we also present the original analyses to highlight how these might have readily led to invalid conclusions. Finally, we demonstrate a potential remedy, whereby we train the decoders on a functional localizer that was specifically designed to target bottom-up sensory signals and as such avoids eye movements. We conclude by arguing for more awareness of the potentially pervasive and ubiquitous effects of eye movement-related confounds.
      This item appears in the following Collection(s)
      • Datasets [1237]
      • Donders Centre for Cognitive Neuroimaging [3356]
      • Faculty of Social Sciences [27115]
       
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