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Articles, Systems/Circuits

Different Neuronal Computations of Spatial Working Memory for Multiple Locations within versus across Visual Hemifields

Ayano Matsushima and Masaki Tanaka
Journal of Neuroscience 16 April 2014, 34 (16) 5621-5626; DOI: https://doi.org/10.1523/JNEUROSCI.0295-14.2014
Ayano Matsushima
Department of Physiology, Hokkaido University School of Medicine, Sapporo 060-8638, Japan
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Masaki Tanaka
Department of Physiology, Hokkaido University School of Medicine, Sapporo 060-8638, Japan
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Abstract

Spatial working memory is one of the most studied cognitive functions, serving as a model system to decipher computational principles of the brain. Although neuronal mechanisms for remembering a single location have been well elucidated, little is known about memory for multiple locations. Here, we examined the activities of prefrontal neurons during monkeys remembered positions of one or two visual cue(s). When the two cues were presented across the left and right visual fields, neurons exhibited a comparable response to the activity for the preferred cue presented alone. When the two cues were presented within the same hemifield, neurons exhibited an intermediate response between those to the individual cues. Subsequent computer simulations predicted a lower signal-to-noise ratio in the latter condition, which was further verified by behavioral experiments. Considering the separation of contralateral and ipsilateral visual processing, the lateral inhibition in local circuits might implicitly determine different neuronal computations and memory capacities for bilateral and unilateral displays.

  • memory capacity
  • prefrontal cortex
  • primate
  • single-unit recording
  • working memory
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The Journal of Neuroscience: 34 (16)
Journal of Neuroscience
Vol. 34, Issue 16
16 Apr 2014
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Different Neuronal Computations of Spatial Working Memory for Multiple Locations within versus across Visual Hemifields
Ayano Matsushima, Masaki Tanaka
Journal of Neuroscience 16 April 2014, 34 (16) 5621-5626; DOI: 10.1523/JNEUROSCI.0295-14.2014

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Different Neuronal Computations of Spatial Working Memory for Multiple Locations within versus across Visual Hemifields
Ayano Matsushima, Masaki Tanaka
Journal of Neuroscience 16 April 2014, 34 (16) 5621-5626; DOI: 10.1523/JNEUROSCI.0295-14.2014
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Keywords

  • memory capacity
  • prefrontal cortex
  • primate
  • single-unit recording
  • working memory

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