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Visual short-term memory load reduces retinotopic cortex response to contrast.

Nikos Konstantinou1, Bahador Bahrami, Geraint Rees

  • 1University of Cyprus. nkonstantinou@gmail.com

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High visual working memory (VWM) load impairs visual processing and detection. Increased VWM load reduces visual cortex activity, supporting the sensory recruitment hypothesis.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Neuroimaging

Background:

  • Load Theory posits high perceptual load reduces responses to irrelevant stimuli.
  • Visual working memory (VWM) is thought to involve sensory recruitment.
  • This suggests VWM load might also impact visual processing.

Purpose of the Study:

  • To test if high VWM load reduces visual cortex responses and detection sensitivity.
  • To investigate the interaction between VWM load and early visual processing.

Main Methods:

  • fMRI and behavioral measures of visual detection sensitivity.
  • Participants performed a VWM task (maintaining color and position) with varying set sizes.
  • Contrast increment detection was measured during VWM maintenance.

Main Results:

  • Increased VWM load reduced retinotopic visual cortex (V1-V3) responses to contrast.
  • Detection sensitivity decreased significantly with higher VWM load.
  • A trade-off was observed between VWM content and detection sensitivity.

Conclusions:

  • High VWM load, like perceptual load, impairs visual detection by reducing early visual cortex activity.
  • Findings support the sensory recruitment hypothesis of VWM.
  • This demonstrates competitive interactions between VWM and visual processing under load.