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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 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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Lobes of the Cerebrum01:22

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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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Motor and Sensory Areas of the Cortex01:14

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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 sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Behaviorally Relevant Abstract Object Identity Representation in the Human Parietal Cortex.

Su Keun Jeong1, Yaoda Xu2

  • 1Harvard University, Cambridge, Massachusetts 02138.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 5, 2016
PubMed
Summary
This summary is machine-generated.

The human parietal cortex represents abstract object identities, including faces, in a behaviorally relevant manner. This finding challenges the view of the parietal cortex as merely involved in attention, revealing its role in rich visual information processing.

Keywords:
attentionfMRI MVPAface perceptionparietal cortexvisual representation

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Object identity representation is crucial for human vision and interaction.
  • Traditionally, object representation is linked to occipital and temporal cortices.
  • The role of the parietal cortex in visual processing, particularly regarding content, is debated.

Purpose of the Study:

  • To investigate the representation of abstract object identity in the human parietal cortex.
  • To determine if parietal cortex representations are invariant to changes in visual features.
  • To assess the behavioral relevance of these parietal representations.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) with multivoxel pattern analysis.
  • Stimuli included famous faces and well-known cars with variations in viewpoint, scene, size, hairstyle, expression, and age.
  • Behavioral task to measure perceived face-identity similarity.

Main Results:

  • Abstract object identity information was found in the superior intraparietal sulcus (IPS) of the parietal cortex.
  • These parietal representations were invariant to significant changes in visual features (e.g., viewpoint, size, expression).
  • Parietal identity representations closely tracked behaviorally perceived object similarities, indicating functional relevance.

Conclusions:

  • The human parietal cortex, specifically the superior IPS, robustly represents abstract object identities.
  • These representations are invariant to various visual transformations and are behaviorally relevant.
  • This supports a 'content-rich' view of the parietal cortex, actively participating in goal-directed visual information processing.