PT  - JOURNAL ARTICLE
AU  - Grossi, Dario
AU  - Fragassi, Nina Antonetta
AU  - Giani, Enrico
AU  - Trojano, Luigi
TI  - The selective inability to draw horizontal lines: a peculiar constructional disorder
AID  - 10.1136/jnnp.64.6.795
DP  - 1998 Jun 01
TA  - Journal of Neurology, Neurosurgery & Psychiatry
PG  - 795--798
VI  - 64
IP  - 6
4099  - http://jnnp.bmj.com/content/64/6/795.short
4100  - http://jnnp.bmj.com/content/64/6/795.full
SO  - J Neurol Neurosurg Psychiatry1998 Jun 01; 64
AB  - 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.