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Mirror image agnosia.

Sadanandavalli Retnaswami Chandra1, Thomas Gregor Issac2

  • 1Department of Neurology, National Institute of Mental Health and Neurosciences, Bengaluru, Karnataka, India.

Indian Journal of Psychological Medicine
|October 23, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces mirror image agnosia, a condition where individuals fail to recognize their own reflected image. This novel finding in patients with parietal lobe atrophy suggests early neural changes in dementia.

Keywords:
Mirror Agnosiamirror image Agnosiareflected image processingright parietal lobe

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Gnosis is the ability to recognize objects with normal perception; agnosia is the failure of this ability.
  • Self-images are unique as they are only seen in reflection.
  • Mirror image agnosia is the failure to recognize one's own reflected image.

Purpose of the Study:

  • To describe a new phenomenon: failure to recognize reflected self-images.
  • To investigate the characteristics and potential causes of mirror image agnosia.

Main Methods:

  • Case study of five patients (4 female, 1 male) exhibiting failure to recognize reflected self-images.
  • Assessment of recognition for others' faces, non-living objects, and presence of apraxias.

Main Results:

  • Patients showed unusual behaviors like conversing with their reflection or mistaking it for an intruder.
  • No prosopagnosia for others' faces or objects on self was observed, except for dressing apraxia in one patient.
  • Mirror image agnosia was associated with parietal lobe atrophy and seemed to diminish as the disease progressed.

Conclusions:

  • Reflected self-images may rely on a specific neural substrate affected early in posterior dementias, particularly right-sided ones.
  • This symptom can be misdiagnosed as psychiatric due to preserved cognition.
  • Early recognition and assessment are crucial for identifying the organic cause and initiating timely interventions.