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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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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...
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Prosopagnosia01:24

Prosopagnosia

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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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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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Related Experiment Video

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Structured Motor Rehabilitation After Selective Nerve Transfers
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Recovery from tactile agnosia: a single case study.

Daniela D'Imperio1,2, Renato Avesani3, Elena Rossato3

  • 1Social Neuroscience Laboratory, Department of Psychology, Sapienza University, Rome, Italy.

Neurocase
|November 23, 2019
PubMed
Summary

Neuropsychological rehabilitation using anodal transcranial direct current stimulation (anodal-tDCS) improved tactile agnosia symptoms. Specific stimulation of the perilesional parietal area showed greater efficacy than non-specific stimulation or no stimulation.

Keywords:
Tactile agnosiaobject identificationparietal lobesomatosensory deficitstDCStactile discrimination

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Area of Science:

  • Neuroscience
  • Neurology
  • Rehabilitation Medicine

Background:

  • Tactile agnosia, a disorder impairing object recognition by touch, presents significant challenges in daily functioning.
  • Neuropsychological rehabilitation aims to improve cognitive and functional deficits post-neurological injury.
  • Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique explored for enhancing neurorehabilitation.

Observation:

  • This study investigated the efficacy of off-line anodal transcranial direct current stimulation (anodal-tDCS) integrated with neuropsychological rehabilitation in a patient with tactile agnosia.
  • The ABABAB paradigm was employed to compare blocks of rehabilitation with and without anodal-tDCS.
  • Anodal-tDCS was applied to either the perilesional parietal area (specific) or a distant occipital area (non-specific).

Findings:

  • Rehabilitation sessions combined with anodal-tDCS demonstrated superior outcomes compared to sessions without stimulation.
  • Specifically, anodal-tDCS applied to the perilesional parietal area yielded the most significant improvements in tactile agnosia.
  • Non-specific stimulation also showed some benefit, but less pronounced than targeted stimulation.

Implications:

  • Integrating anodal-tDCS, particularly targeting the perilesional parietal cortex, can enhance the effectiveness of neuropsychological rehabilitation for tactile agnosia.
  • This approach offers a promising avenue for improving functional recovery in patients with somatosensory processing deficits.
  • Further research is warranted to optimize stimulation parameters and confirm findings in larger patient cohorts.