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Related Experiment Videos

A parieto-frontal network for visual numerical information in the monkey.

Andreas Nieder1, Earl K Miller

  • 1Picower Center for Learning and Memory, and Department of Brain and Cognitive Sciences, RIKEN-Massachusetts Institute of Technology Neuroscience Research Center, Cambridge, MA 02139, USA. andreas.nieder@uni-tuebingen.de

Proceedings of the National Academy of Sciences of the United States of America
|May 5, 2004
PubMed
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This study reveals a parieto-frontal network for numerical cognition in monkeys. Information about numerosity travels from the posterior parietal cortex to the prefrontal cortex, aiding numerical judgments.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Comparative Psychology

Background:

  • Electrophysiological studies suggest the prefrontal cortex (PFC) and posterior parietal cortex (PPC) are involved in numerical judgments.
  • The precise functional organization and neural contributions of these areas remain unclear, with no direct comparison of their activity during such tasks.

Purpose of the Study:

  • To investigate the neural activity in the PPC and anterior inferior temporal cortex during visual numerosity judgment.
  • To compare this activity with neural populations in the PFC.
  • To elucidate the flow of numerical information within the primate brain.

Main Methods:

  • Surveyed neural activity in the PPC and anterior inferior temporal cortex of monkeys performing a visual numerosity judgment task.

Related Experiment Videos

  • Compared PPC and anterior inferior temporal cortex neural activity with that of PFC neurons.
  • Analyzed the timing and selectivity of neuronal responses related to numerosity.

    • Main Results:

    • The highest proportion of numerosity-selective neurons was found in the fundus of the intraparietal sulcus within the PPC.
    • Few numerosity-selective neurons were identified in other PPC regions or the anterior inferior temporal cortex.
    • Neurons in the fundus of the intraparietal sulcus showed earlier responses and conveyed numerosity information sooner than PFC neurons.

    Conclusions:

    • Findings suggest a parieto-frontal network for numerosity processing in monkeys.
    • Evidence indicates a potential information flow from the PPC to the lateral PFC for numerical judgments.
    • Establishes homologies between monkey and human brain regions involved in numerical cognition.