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Transient topographical disorientation.

E Gil-Néciga1, R Alberca, F Boza

  • 1Department of Neurology, Hospital Vírgen del Rocío, Sevilla, Spain. neciga@inicia.es

European Neurology
|November 8, 2002
PubMed
Summary
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Transient topographical disorientation (TTD) involves temporary inability to navigate familiar places. Studies suggest TTD is linked to persistent right hemisphere dysfunction, potentially pre-existing or resulting from the disorientation event.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Transient topographical disorientation (TTD) is characterized by temporary navigation difficulties in familiar environments.
  • Patients remain conscious and retain memory recall during TTD episodes.

Observation:

  • Ten patients experiencing TTD were studied post-episode.
  • Two TTD subtypes emerged: spatial disorientation with intact landmark recognition, and difficulties with landmark recognition.
  • Spatial orientation and visuoperceptive tests revealed deficits in most patients.

Findings:

  • Brain SPECT scans indicated right hemisphere hypoperfusion in all TTD patients.
  • This hypoperfusion was observable in some patients even two years later.
  • TTD is frequently associated with persistent, unexplained right hemisphere dysfunction.

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Implications:

  • Persistent right hemisphere dysfunction may predispose individuals to TTD.
  • TTD could be a consequence of acute neurological events or a manifestation of underlying deficits.
  • Further research is needed to elucidate the cause of this chronic alteration.