August 2010
Volume 10, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2010
Visual Short-Term Memory Load Induced Blindness
Author Affiliations
  • Nikos Konstantinou
    Institute of Cognitive Neuroscience, University College London
  • Bahador Bahrami
    Institute of Cognitive Neuroscience, University College London
    Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London
  • Geraint Rees
    Institute of Cognitive Neuroscience, University College London
    Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London
  • Nilli Lavie
    Institute of Cognitive Neuroscience, University College London
Journal of Vision August 2010, Vol.10, 720. doi:10.1167/10.7.720
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      Nikos Konstantinou, Bahador Bahrami, Geraint Rees, Nilli Lavie; Visual Short-Term Memory Load Induced Blindness. Journal of Vision 2010;10(7):720. doi: 10.1167/10.7.720.

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Abstract

We present imaging and behavioral experiments, establishing that visual short-term memory (VSTM) load, similar to perceptual load (e.g. Macdonald and Lavie (2008), but opposite to task-unrelated verbal working memory load (see Konstantinou & Lavie, 2010), can reduce both detection sensitivity (d') and the related signal in V1 for peripheral stimuli presented during the memory delay. Participants in the fMRI scanner were required to maintain the color and position of a memory set (consisting of colored squares) and detect a contrast increment (CI) presented in one of the four quadrants during the delay. VSTM load was varied through the memory set size. Both the CI related stimulus-induced retinotopic V1 response and detection sensitivity were significantly reduced under the high (vs. low) load condition demonstrating “VSTM load-induced blindness”. Moreover, a significant negative correlation between the magnitude of VSTM load effects on memory capacity (i.e. Cowan's K) and on detection sensitivity showed that the impact of VSTM load on detection sensitivity was reliably predicted by the extent to which VSTM was occupied. This trade-off between the estimated number of items held in VSTM and detection sensitivity further demonstrates shared resources between VSTM and conscious perception.

Konstantinou, N. Bahrami, B. Rees, G. Lavie, N. (2010). Visual Short-Term Memory Load Induced Blindness [Abstract]. Journal of Vision, 10(7):720, 720a, http://www.journalofvision.org/content/10/7/720, doi:10.1167/10.7.720. [CrossRef]
Footnotes
 Wellcome Trust grant (WT080568MA).
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