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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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Somatosensation01:33

Somatosensation

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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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Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the...
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Somatosensory, Motor, and Association Cortex01:23

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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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Overview of Somatic Sensory Pathways01:29

Overview of Somatic Sensory Pathways

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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
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Association Areas of the Cortex01:21

Association Areas of the Cortex

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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:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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Visual-tactile processing in primary somatosensory cortex emerges before cross-modal experience.

Malte Bieler1, Kay Sieben1, Sandra Schildt1

  • 1Developmental Neurophysiology, University Medical Center Hamburg-Eppendorf, Hamburg, 20251, Germany.

Synapse (New York, N.Y.)
|January 21, 2017
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Summary

Multisensory processing, integrating visual and tactile input, develops early in rats. These brain functions emerge before cross-modal experience and mature during juvenile development.

Keywords:
developmentneuronal networksneuronal spikingoscillationsphase reset

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience

Background:

  • Unisensory neocortical areas integrate multisensory information through neural network oscillations.
  • Neonatal unimodal experience is crucial for establishing multisensory processing networks.
  • The role of early cross-modal experience in multisensory processing development remains unclear.

Purpose of the Study:

  • To investigate the developmental trajectory of visual-somatosensory interactions.
  • To examine the anatomical basis of multisensory processing in developing rats.
  • To determine the influence of early experience on multisensory integration.

Main Methods:

  • Extracellular recordings of neural network activity in primary sensory cortices in vivo.
  • Assessment of cortico-cortical connectivity in pigmented rats.
  • In vivo electrophysiology and anatomical tracing techniques.

Main Results:

  • Juvenile rats exhibit adult-like multisensory processing, including supra-additive responses and modulated network oscillations.
  • Visual-tactile stimuli enhance neuronal coupling to theta and alpha oscillations in juveniles.
  • Abundant direct visual-somatosensory connections and thalamocortical feedforward pathways support juvenile multisensory processing.

Conclusions:

  • Cellular and network mechanisms for multisensory processing are established before significant cross-modal experience.
  • Multisensory integration refines during juvenile development, independent of extensive early cross-modal exposure.
  • Early development of sensory processing pathways is robust and precedes experiential refinement.