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The graded fate of unattended stimulus representations in visuospatial working memory

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Abstract
As in visual perception, information can be selected for prioritized processing at the expense of unattended representations in visual working memory (VWM). However, what is not clear is whether and how this prioritization degrades the unattended representations. We addressed two hypotheses. First, the representational quality of unattended items could be degraded as a function of the spatial distance to attended information in VWM. Second, the strength with which an item is bound to its location is degraded as a function of the spatial distance to attended information in VWM. To disentangle these possibilities, we designed an experiment in which participants performed a continuous production task in which they memorized a visual array with colored discs, one of which was spatially retro-cued, informing the target location of an impending probe that was to be recalled (Experiment 1). We systematically varied the spatial distance between the cued and probed locations and obtained model-based estimates of the representational quality and binding strengths at varying cue-probe distances. Although the representational quality of the unattended representations remained unaffected by the cue-probe distance, spatially graded binding strengths were observed, as reflected in more spatial confusions at smaller cue-probe distances. These graded binding strengths were further replicated with a model-free approach in a categorical version of the production task in which stimuli and responses consisted of easily discriminable colors (Experiment 2). These results demonstrate that unattended representations are prone to spatial confusions due to spatial degradation of binding strengths in WM, even though they are stored with the same representational quality.
Keywords
SPATIAL-DISTRIBUTION, ATTENTION, SUPPRESSION, DETERMINES, RESOURCES, GRADIENTS, OBJECTS, FOCUS, spatial attention, working memory, memory quality, binding errors, distance effects

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Chicago
Sahan, Muhammet Ikbal, Edwin S Dalmaijer, Tom Verguts, Masud Husain, and Wim Fias. 2019. “The Graded Fate of Unattended Stimulus Representations in Visuospatial Working Memory.” Frontiers in Psychology 10.
APA
Sahan, M. I., Dalmaijer, E. S., Verguts, T., Husain, M., & Fias, W. (2019). The graded fate of unattended stimulus representations in visuospatial working memory. FRONTIERS IN PSYCHOLOGY, 10.
Vancouver
1.
Sahan MI, Dalmaijer ES, Verguts T, Husain M, Fias W. The graded fate of unattended stimulus representations in visuospatial working memory. FRONTIERS IN PSYCHOLOGY. 2019;10.
MLA
Sahan, Muhammet Ikbal et al. “The Graded Fate of Unattended Stimulus Representations in Visuospatial Working Memory.” FRONTIERS IN PSYCHOLOGY 10 (2019): n. pag. Print.
@article{8608836,
  abstract     = {As in visual perception, information can be selected for prioritized processing at the expense of unattended representations in visual working memory (VWM). However, what is not clear is whether and how this prioritization degrades the unattended representations. We addressed two hypotheses. First, the representational quality of unattended items could be degraded as a function of the spatial distance to attended information in VWM. Second, the strength with which an item is bound to its location is degraded as a function of the spatial distance to attended information in VWM. To disentangle these possibilities, we designed an experiment in which participants performed a continuous production task in which they memorized a visual array with colored discs, one of which was spatially retro-cued, informing the target location of an impending probe that was to be recalled (Experiment 1). We systematically varied the spatial distance between the cued and probed locations and obtained model-based estimates of the representational quality and binding strengths at varying cue-probe distances. Although the representational quality of the unattended representations remained unaffected by the cue-probe distance, spatially graded binding strengths were observed, as reflected in more spatial confusions at smaller cue-probe distances. These graded binding strengths were further replicated with a model-free approach in a categorical version of the production task in which stimuli and responses consisted of easily discriminable colors (Experiment 2). These results demonstrate that unattended representations are prone to spatial confusions due to spatial degradation of binding strengths in WM, even though they are stored with the same representational quality.},
  articleno    = {374},
  author       = {Sahan, Muhammet Ikbal and Dalmaijer, Edwin S and Verguts, Tom and Husain, Masud and Fias, Wim},
  issn         = {1664-1078},
  journal      = {FRONTIERS IN PSYCHOLOGY},
  language     = {eng},
  pages        = {13},
  title        = {The graded fate of unattended stimulus representations in visuospatial working memory},
  url          = {http://dx.doi.org/10.3389/fpsyg.2019.00374},
  volume       = {10},
  year         = {2019},
}

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