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Does Contralateral Delay Activity Reflect Working Memory Storage or the Current Focus of Spatial Attention within

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The contralateral delay activity (CDA) in working memory may reflect attention, not just storage. CDA components shifted with new visual stimuli, indicating focus on recent items rather than total stored information.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Working Memory

Background:

  • The contralateral delay activity (CDA) is a sustained negativity in event-related potentials observed over posterior visual regions.
  • CDA is traditionally interpreted as a neural marker for the storage of visual information in working memory.

Purpose of the Study:

  • To investigate whether CDA reflects working memory storage or the focus of spatial attention.
  • To differentiate between the storage and attentional activation accounts of CDA.

Main Methods:

  • Two experiments used a sequential loading procedure with two memory displays (M1 and M2).
  • Participants memorized task-relevant items presented across successive displays.
  • Event-related potentials, specifically CDA, were measured during visual working memory tasks.

Main Results:

  • CDA components initially reflected items from the first display (M1).
  • When the second display (M2) appeared on the opposite side, CDA polarity reversed and exclusively tracked M2 items.
  • CDA showed sensitivity to M1 items only when M1 and M2 were on the same side or M2 was nonlateral.

Conclusions:

  • CDA amplitudes are primarily sensitive to the activation of working memory representations within the current focus of spatial attention.
  • Results challenge the view that CDA directly reflects the total number of stored objects in working memory.
  • CDA may be a dynamic neural correlate of attentional selection within working memory.