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Related Concept Videos

Somatosensory, Motor, and Association Cortex01:24

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
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Mesoscale functional architecture in medial posterior parietal cortex.

Riichiro Hira1,2,3, Leah B Townsend2, Ikuko T Smith4

  • 1Department of Electrical and Computer Engineering, University of California Santa Barbara.

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Summary

The posterior parietal cortex (PPC) in mice has distinct functional modules. Area A processes posture and memory, while area AM integrates multisensory and cognitive information.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Systems Neuroscience

Background:

  • The posterior parietal cortex (PPC) in mice is implicated in diverse functions like multisensory integration, vision-guided behaviors, working memory, and posture control.
  • However, a comprehensive understanding of these functions and their precise localization within the PPC and higher visual areas (HVAs) remains incomplete.

Purpose of the Study:

  • To investigate the distinct functional roles and cortical communication modes of different areas within the medial posterior parietal cortex (PPC).
  • To elucidate the specific contributions of the anteromedial (AM) and anterior (A) HVAs to behavior-related information processing.

Main Methods:

  • Simultaneous in vivo imaging of thousands of neurons across eight cortical areas surrounding the PPC using a two-photon mesoscope.
  • Mice performed vision-guided and choice history-dependent tasks while neuronal activity was recorded.
  • Mesoscale correlation analysis was employed to examine intertrial variability and interarea neuronal communication.

Main Results:

  • Distinct, localized, behavior-related functions were identified in two medial PPC areas: anteromedial (AM) HVA and anterior (A) HVA.
  • AM HVA neurons responded to both visual and choice information, indicating its role in associating these sensory channels.
  • A HVA neurons exhibited sequential dynamics for storing choice history and representing posture, with shared fluctuations with the primary somatosensory area.

Conclusions:

  • The medial PPC comprises two distinct modules, areas A and AM, each with unique communication strategies.
  • Area A serves as a hub for transmitting information related to posture, movement, and working memory.
  • Area AM functions as a critical site for multisensory and cognitive integration, processing locally derived signals.