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Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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Brain structure changes visualized in early- and late-onset blind subjects.

Natasha Leporé1, Patrice Voss, Franco Lepore

  • 1Laboratory of Neuro Imaging, Department of Neurology, David Geffen School of Medicine at UCLA, University of California-Los Angeles, 635 Charles E. Young Drive South, Los Angeles, CA 90095, USA. nlepore@loni.ucla.edu

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Brain structure changes due to blindness differ based on onset age. Early-onset blindness causes more widespread white matter changes, suggesting altered neurodevelopment in blind individuals.

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Area of Science:

  • Neuroscience
  • Neuroimaging
  • Human Anatomy

Background:

  • Blindness impacts brain structure and function.
  • The timing of blindness onset may influence neuroplasticity and compensatory mechanisms.
  • Understanding these changes is crucial for comprehending brain adaptation.

Purpose of the Study:

  • To investigate 3D brain volume differences in early-onset (EB) and late-onset (LB) blind adults compared to sighted controls.
  • To map specific regions of volume reduction and gain associated with the timing of blindness onset.
  • To explore potential compensatory adaptations in brain structure related to visual deprivation.

Main Methods:

  • Utilized tensor-based morphometry (TBM) on structural MRI data.
  • Fluidly registered individual brain MRIs to a common template for group comparisons.
  • Statistically analyzed deformation fields to identify significant anatomical differences between EB, LB, and sighted groups.

Main Results:

  • Both EB and LB groups showed significant volume reductions in primary and secondary visual cortices.
  • Significant white matter hypertrophy was observed in non-occipital regions for both blind groups, indicating compensatory adaptations.
  • Early-onset blind individuals (EB) exhibited additional deficits in the splenium and isthmus, with more widespread white matter gains compared to late-onset blind individuals (LB).

Conclusions:

  • Blindness leads to profound structural alterations in visual processing areas and compensatory changes in other brain regions.
  • The age of blindness onset influences the pattern and extent of brain structural modifications, particularly in white matter.
  • Observed differences may reflect altered late neurodevelopmental processes, such as myelination, in individuals with early-onset blindness.