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A neural system for human visual working memory

L G Ungerleider1, S M Courtney, J V Haxby

  • 1Laboratory of Brain and Cognition, National Institute of Mental Health, Building 10, Room 4C104, 10 Center Drive, Bethesda, MD 20892-1366, USA. lgu@ln.nimh.nih.gov

Proceedings of the National Academy of Sciences of the United States of America
|March 14, 1998
PubMed
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Visual working memory relies on a distributed brain network. While similar in monkeys and humans, spatial working memory shows distinct location differences in the human brain, possibly due to language evolution.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience

Background:

  • Working memory actively maintains information for brief use.
  • Visual working memory involves coordinated activity in visual and prefrontal cortices.
  • Domain specificity exists: ventral stream for objects, dorsal stream for spatial locations.

Purpose of the Study:

  • To compare the neural organization of visual working memory in monkeys and humans.
  • To investigate species-specific differences in object and spatial working memory representation.
  • To explore the evolutionary implications of these differences, particularly regarding language emergence.

Main Methods:

  • Comparative analysis of neural systems supporting visual working memory in monkeys and humans.
  • Examination of functional specialization within visual and prefrontal cortices for object versus spatial information.

Related Experiment Videos

  • Neuroanatomical comparisons focusing on the location of specialized visual areas.

    • Main Results:

    • Both species utilize distributed networks for visual working memory.
    • Object working memory areas are similarly located in ventrolateral prefrontal cortex.
    • Spatial working memory areas show distinct locations: more superior/posterior in human dorsal prefrontal cortex compared to monkeys.

    Conclusions:

    • The neural system for visual working memory is largely conserved between monkeys and humans.
    • Differences in spatial working memory localization in humans may relate to evolutionary adaptations, including language.
    • Functional and anatomical shifts in posterior and frontal cortices highlight species-specific cognitive evolution.