Gravitational inputs modulate visuospatial neglect

Experimental Brain Research
L PizzamiglioF Doricchi

Abstract

Right brain-damaged patients with left visuospatial neglect were required to bisect a line placed in front of them in two different body positions (upright and supine) and two different light conditions (light and dark). The neglect patients, unlike right brain-damaged patients without neglect, strongly reduced their rightward directional error in the supine compared with the upright position. No systematic changes were produced by the light-dark manipulation. The present result cannot be explained with an attentional interpretation of hemispatial neglect. We suggest that the present data provide further evidence that hemineglect is the consequence of a mismatch between different afferent information integrated into an egocentric space representation. According to this model, the presence of a lateralized brain lesion produces asymmetries in some intermediate spatial representations (eye-head, head-trunk, body-environment) but not in the retinotopic one. Any experimental manipulation that reduces the asymmetry of the intermediate representation such as the reduction of gravitational inputs may improve the dynamic integration of the egocentric coordinates.

Citations

Nov 18, 2005·Experimental Brain Research·Andrea PeruSalvatore M Aglioti
Feb 3, 2011·Journal of Neurology·Sahawanatou GassamaMarc Rousseaux
Sep 13, 2005·Neuropsychologia·Christelle RichardJacques Honoré
Oct 21, 2000·Progress in Neurobiology·G Kerkhoff
Mar 10, 2001·Neuroscience Letters·C RichardJ Honoré
Aug 31, 1999·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·M M Mesulam
Jul 27, 2006·Journal of Neurology, Neurosurgery, and Psychiatry·J BarraD Pérennou
Feb 9, 1999·Journal of Cognitive Neuroscience·S AgliotiA Peru
Jul 26, 2006·Brain Research·Andrea Peru, Jean Sebastien Morgant
May 16, 2008·Neuropsychologia·Christophe LopezLiliane Borel
Apr 11, 2001·Archives of Physical Medicine and Rehabilitation·D A PérennouJ Y Pélissier

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