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Related Concept Videos

Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

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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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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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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.
Motor 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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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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Periodontal tactile input activates the prefrontal cortex.

Nobuaki Higaki1, Takaharu Goto1, Tetsuo Ichikawa1

  • 1Department of Oral and Maxillofacial Prosthodontics, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto, Tokushima 770-8504, Japan.

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Summary

Sensory integration during motor tasks, like biting, activates the prefrontal cortex (PFC). Blocking sensory input reduced PFC activity but did not affect biting force, highlighting the PFC's role in processing sensory information.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Sensory Physiology

Background:

  • The prefrontal cortex (PFC) is crucial for cognitive functions including planning and decision-making.
  • The impact of sensory integration during motor tasks on PFC activation remains unexplored.
  • Understanding sensory processing in motor tasks can reveal insights into PFC function.

Purpose of the Study:

  • To investigate how peripheral sensory information and external stimuli affect prefrontal cortex (PFC) activation during a motor task.
  • To determine the role of sensory integration in cognitive functions mediated by the PFC.

Main Methods:

  • Utilized functional near-infrared spectroscopy (fNIRS) to measure cerebral blood flow (CBF) changes.
  • Employed an occlusal force (biting) task to simulate a motor activity.
  • Administered local anesthesia to block peripheral sensory input from the periodontal ligament.

Main Results:

  • Visual and auditory information integration during the biting task increased CBF in Brodmann areas 46 and 10 of the PFC.
  • Local anesthesia significantly decreased PFC CBF.
  • Occlusal force maintenance remained unaffected by the reduction in sensory input.

Conclusions:

  • Peripheral sensory information from the periodontal ligament and external sensory inputs have minimal influence on maintaining occlusal force.
  • These sensory inputs are significant modulators of prefrontal cortex (PFC) activation during motor tasks.
  • The study demonstrates a link between sensory integration and PFC activity in motor control.