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Related Concept Videos

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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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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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:
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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Overview of Somatic Sensory Pathways01:29

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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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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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Development of the Limb Synovial Joints01:07

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Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...
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A Somatosensory Computation That Unifies Limbs and Tools.

Luke E Miller1,2,3,4, Cécile Fabio5,2,3, Frédérique de Vignemont6

  • 1Integrative Multisensory Perception Action and Cognition Team-ImpAct, Lyon Neuroscience Research Center, Institut National de la Santé et de la Recherche Médicale Unité 1028, Centre National de la Recherche Scientifique Unité 5292, 69500 Bron, France luke.miller@donders.ru.nl.

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Summary

The brain uses trilateration, a spatial computation for body touch localization, to also process touch on tools. This fundamental mechanism allows for precise touch perception whether interacting with limbs or external objects.

Keywords:
computationembodimentspacetactile localizationtool use

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Robotics

Background:

  • The brain's ability to integrate sensory information for spatial awareness is crucial for interaction with the environment.
  • Tools are often considered extensions of the body, but the neural mechanisms underlying tool use are not fully understood.
  • Tactile localization on the body relies on trilateration, a computation using sensory input and limb boundaries.

Purpose of the Study:

  • To investigate whether the brain repurposes its body-based tactile localization computation, trilateration, for processing touch on tools.
  • To determine if the precision patterns observed in body tactile localization are replicated when using tools.

Main Methods:

  • Behavioral experiments with human participants localizing touch on a tool.
  • Development and application of a computational model of trilateration.
  • Implementation of a neural network model based on probabilistic population coding to simulate trilateration for tool use.

Main Results:

  • Participants exhibited a signature of trilateration when localizing touch on a tool, with highest precision near the tool's base and tip.
  • A computational model of trilateration accurately predicted the observed behavioral data.
  • The neural network simulations successfully replicated the trilateration signature using tool-specific vibration patterns.

Conclusions:

  • The brain repurposes the fundamental spatial computation of trilateration for tactile localization on tools.
  • Trilateration is a unifying spatial computation that applies to both body parts and tools.
  • These findings suggest a fundamental mechanism for how somatosensory neural populations process spatial information during tool embodiment.