The selective inability to draw horizontal lines: A peculiar constructional disorder

Dario Grossi, Nina Antonetta Fragassi, Enrico Giani, Luigi Trojano

Research output: Contribution to journalArticlepeer-review


A patient is described who was affected by degenerative dementia and who developed severe constructional apraxia. She showed a dissociation between the construction of horizontal lines (impaired) and oblique or vertical lines (spared) which has never been reported previously. A battery of tests disclosed that this phenomenon was consistent across a range of experimental conditions and that a similar dissociation was evident in perceptual and representational domains. This peculiar clinical finding suggests that mental representations of horizontal and vertical spatial relations in an egocentric coordinate system are functionally dissociated.

Original languageEnglish
Pages (from-to)795-798
Number of pages4
JournalJournal of Neurology, Neurosurgery and Psychiatry
Issue number6
Publication statusPublished - Jun 1998


  • Constructional apraxia
  • Dementia
  • Visuospatial defects

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Neuroscience(all)
  • Psychiatry and Mental health


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