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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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Sensory Processing Phenotypes in Fragile X Syndrome.

Maham Rais1,2, Devin K Binder1,2,3, Khaleel A Razak2,3,4

  • 11 Division of Biomedical Sciences, University of California Riverside School of Medicine, CA, USA.

ASN Neuro
|September 21, 2018
PubMed
Summary

Fragile X syndrome (FXS) causes intellectual disability and autism, with individuals often experiencing sensory hypersensitivity. Research highlights auditory, visual, and tactile processing deficits in FXS, offering insights for therapeutic development.

Keywords:
autism spectrum disordersfragile X syndromeneurodevelopmental disorderssensory hypersensitivity

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • Fragile X syndrome (FXS) is a leading genetic cause of intellectual disability and autism.
  • Individuals with FXS exhibit significant sensory processing abnormalities, including hypersensitivity across auditory, visual, and somatosensory modalities.
  • These sensory deficits manifest as avoidance behaviors and impaired perception.

Purpose of the Study:

  • To review clinical, functional, and structural studies on auditory, visual, and somatosensory processing deficits in FXS.
  • To explore the utility of animal models in understanding FXS sensory phenotypes.
  • To identify potential translational platforms for biomarker development and therapeutic strategies.

Main Methods:

  • Review of clinical, behavioral, and electrophysiological studies in humans with FXS.
  • Analysis of findings from fragile X mental retardation 1 (Fmr1) gene knockout (KO) rodent models.
  • Comparison of sensory processing deficits across species.

Main Results:

  • Consistent evidence of auditory hypersensitivity, impaired habituation, and reduced attention in humans with FXS.
  • Documented visuospatial impairments and deficits in processing visual stimuli and temporal information in children with FXS.
  • FXS animal models exhibit analogous sensory deficits, including auditory hypersensitivity and altered somatosensory processing.

Conclusions:

  • Sensory processing deficits are a core feature of FXS, conserved across species.
  • Animal models provide valuable insights into the neural mechanisms underlying FXS sensory phenotypes.
  • Understanding conserved sensory circuits can facilitate the development of novel therapeutic approaches for FXS.