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Related Concept Videos

Sensory Modalities01:15

Sensory Modalities

4.2K
Sensation typically is the process by which the sensory receptors and sense organs detect stimuli from the internal and external environment and transmit this information to the central nervous system for processing.
General senses refer to the broad category of sensory information detected by receptors in the body and can be further grouped into somatic and visceral senses. Somatic sensations include touch, pressure, temperature, and pain and are essential for navigating our environment and...
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Introduction to Special Senses01:26

Introduction to Special Senses

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Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
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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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Synesthesia01:27

Synesthesia

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Synesthesia is a remarkable condition where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People with synesthesia experience a blending or crossing of their senses, such as sight and sound, leading to cross-modal sensations. In this condition, the stimulation of one sense, such as hearing a number or musical note, triggers an experience of another sense, like sensing a specific color, taste, or smell. People...
826
Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

11.8K
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...
11.8K
What is a Sensory System?01:31

What is a Sensory System?

102.4K
Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
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Related Experiment Video

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Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder
09:13

Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder

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Functional sensory symptoms.

J Stone1, M Vermeulen2

  • 1Department of Clinical Neurosciences, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK.

Handbook of Clinical Neurology
|October 11, 2016
PubMed
Summary
This summary is machine-generated.

Functional sensory symptoms involve genuine sensory changes without neurological disease, often marked by internal inconsistencies due to focused attention. Diagnosis and treatment require careful consideration due to potentially unreliable diagnostic signs.

Keywords:
conversion disorderfunctional neurologic symptomsnonorganicpsychogenic

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Area of Science:

  • Neurology
  • Psychiatry
  • Symptomatology

Background:

  • Functional sensory symptoms are genuine alterations in sensation without underlying neurological disease.
  • Historically linked to
  • hysteria,
  • these symptoms are characterized by internal inconsistencies.
  • Often coexist with functional limb weakness and movement disorders.

Purpose of the Study:

  • To review the history, clinical presentations, diagnosis, treatment, and prognosis of functional sensory symptoms.
  • To highlight the diagnostic challenges and reliability of physical signs.
  • To differentiate functional sensory symptoms from other unusual sensory phenomena.

Main Methods:

  • Literature review encompassing historical descriptions, clinical patterns, and diagnostic approaches.
  • Analysis of diagnostic test sensitivity and reliability of physical signs.
  • Comparison with non-functional sensory symptoms like synesthesia and allochiria.

Main Results:

  • Functional sensory symptoms exhibit recognizable patterns (e.g., hemisensory disturbance) but diagnostic signs may lack reliability.
  • Internal inconsistency, driven by focused attention, is a key diagnostic feature.
  • Some functional sensory symptoms, like complete loss of pain sensation, are highly unusual.

Conclusions:

  • Functional sensory symptoms are a distinct clinical entity requiring further study.
  • Diagnostic reliability of physical signs is questionable, necessitating a nuanced diagnostic approach.
  • Further research into unusual presentations like complete pain loss is warranted.