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Memory, Numbers, and Action Decision in Human Posterior Parietal Cortex.

Josef Parvizi1, Anthony D Wagner2

  • 1Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA; Stanford Neurosciences Institute, Stanford University, Stanford, CA, USA; Stanford Human Intracranial Cognitive Electrophysiology Program (SHICEP), Stanford University, Stanford, CA, USA.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience

Background:

  • The human posterior parietal cortex (PPC) exhibits functional specialization across its subregions.
  • This heterogeneity is observed during complex cognitive tasks like memory and numerical decision-making.

Purpose of the Study:

  • To investigate the functional heterogeneity within a specific region of the anterior intraparietal sulcus (IPS).
  • To examine neuronal activity at a local level during memory-based decisions.

Main Methods:

  • Electrophysiological recordings in humans.
  • Analysis of neuronal activity during mnemonic tasks.

Main Results:

  • Striking local functional heterogeneity was found within a small area of the anterior IPS.
  • Neuronal activity patterns varied significantly even at a fine-grained scale during memory-based decisions.

Conclusions:

  • The anterior IPS is not functionally uniform, displaying significant local heterogeneity.
  • This neuronal diversity likely contributes to the complex cognitive functions supported by this brain region, such as memory-based decision-making.