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Object maintenance beyond their visible parts in working memory.

Siyi Chen1,2, Thomas Töllner1,2, Hermann J Müller1,2,3

  • 1Department of Psychology, Ludwig-Maximilians-Universität München, Munich , Germany.

Journal of Neurophysiology
|October 27, 2017
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Completing partially hidden objects uses visual working memory (VWM) resources. Forming a whole object representation in VWM enhances performance but requires more memory, especially with fewer items.

Keywords:
amodal completioncontralateral delay activityvisual working memory

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Memory Research

Background:

  • Amodal completion involves constructing a whole object representation from partial visual input.
  • This process is thought to rely on mental imagery maintained in visual working memory (VWM).

Purpose of the Study:

  • To investigate the relationship between VWM storage and object completion processes.
  • To determine if completed object representations consume VWM resources and affect performance.

Main Methods:

  • Event-related potentials (ERPs) were recorded, specifically contralateral delay activity (CDA), to measure VWM maintenance.
  • A change detection task was used with composite objects primed to be perceived as either completed or mosaic representations.

Main Results:

  • Change detection accuracy was higher for completed objects versus mosaic representations when memorizing two items, but this advantage diminished with four items.
  • Electrophysiological data showed increased CDA amplitudes for completed objects, indicating greater VWM engagement.
  • Behavioral and electrophysiological results demonstrated that object completion modulates VWM load.

Conclusions:

  • Constructing a complete object representation from partial visual input requires and utilizes VWM resources.
  • This process, while resource-intensive, can improve performance by simplifying the representation in VWM.
  • The memory load is influenced by the structured nature of the representations held in VWM.