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Related Concept Videos

Somatosensory, Motor, and Association Cortex01:24

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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Association Areas of the Cortex01:21

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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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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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Sensory Perception: Organization of the Somatosensory System01:11

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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:
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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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Major Somatic Sensory Pathways01:28

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Human cortex organizes dynamic co-fluctuations along sensation-association axis.

De-Zhi Jin1, Changsong Zhou2, Xi-Nian Zuo3,4,5

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Brain functional networks transition based on amplitude, with sensorimotor systems active during high amplitudes and associative/limbic systems during lower amplitudes. This organization refines with development and external stimuli.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Systems Neuroscience

Background:

  • The human brain's functional organization relies on coordinated neural fluctuations.
  • Understanding how these large-scale co-fluctuations transition across different amplitude levels is crucial but remains largely unknown.

Purpose of the Study:

  • To investigate the principles governing amplitude-dependent transitions of functional brain network interactions.
  • To introduce a novel metric, the co-fluctuation score, for quantifying these dynamic reorganizations.

Main Methods:

  • Utilized resting-state functional magnetic resonance imaging (fMRI) data.
  • Introduced and applied a "co-fluctuation score" to analyze instantaneous functional interactions relative to global amplitude dynamics.
  • Examined data across multiple independent samples, including high-resolution 7T fMRI.

Main Results:

  • Identified distinct amplitude-dependent co-fluctuation states aligned with the sensorimotor-association (SA) axis.
  • Sensorimotor networks dominated high-amplitude states, associative systems thrived in intermediate amplitudes, and limbic systems engaged in low-amplitude states.
  • Observed developmental refinement of this hierarchy from childhood to adulthood and adaptive reconfiguration under external stimuli.

Conclusions:

  • The sensorimotor-association (SA) axis serves as a fundamental organizational principle for amplitude-dependent brain network transitions.
  • The brain dynamically balances external processing (high-amplitude) with internal cognition/emotion (mid-to-low amplitude) via amplitude-stratified interactions.
  • This framework integrates transient coordination with stable functional architecture, offering insights into brain dynamics across development and in response to stimuli.