Misprojection of landmarks onto the spatial map

Brain and Cognition
Alessio Toraldo, Carlo Reverberi

Abstract

It has been suggested that neglect patients misrepresent the metric spatial relations along the horizontal axis (anisometry). The "fabric" of their internal spatial medium would be distorted in such a way that physically equal distances appear relatively shorter on the contralesional side (canonical anisometry). The case of GL, a 76-year-old lady with left neglect on visual search tasks, is presented. GL showed severe relative overestimation on the left (contralesional) side on two independent tasks evaluating the metrics of her internal representation. A qualitatively similar pattern was found in two out of 10 other neglect patients who performed the second task. This behavior cannot be accounted for by the canonical anisometry hypothesis. Nevertheless, GL produced a relative left overextension (underestimation) when trying to set the endpoints of a virtual line given its midpoint (Endpoints Task). An interpretation of these results is offered in terms of a misprojection of relevant landmarks onto the internal representation without assuming distortion of its "fabric."

References

Feb 1, 1979·Annals of Neurology·K M Heilman, E Valenstein
Sep 1, 1979·Brain : a Journal of Neurology·E BisiachD Perani
Dec 1, 1989·Journal of Clinical and Experimental Neuropsychology·P W Halligan, J C Marshall
Dec 1, 1989·Brain : a Journal of Neurology·S IshiaiH Tsukagoshi
Jun 1, 1988·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·P W Halligan, J C Marshall
Jun 1, 1973·Neurology·M L Albert
Jul 1, 1995·Trends in Neurosciences·M JeannerodH Sakata
Apr 1, 1995·Brain : a Journal of Neurology·A Chatterjee
Feb 1, 1995·Brain and Cognition·M HarveyR C Roberts
Jun 1, 1996·Brain : a Journal of Neurology·E BisiachG Antonucci
Sep 1, 1996·Journal of the International Neuropsychological Society : JINS·J C Marshall, P W Halligan
Jan 28, 1998·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·S PitzalisP Zoccolotti
Sep 12, 1998·Brain and Cognition·P W Halligan, J C Marshall
Dec 3, 1998·Experimental Brain Research·A D MilnerC L Pritchard
Dec 1, 2001·Neuroreport·M HarveyI D Gilchrist

❮ Previous
Next ❯

Related Concepts

Related Feeds

Brain Ischemia

Brain ischemia is a condition in which there is insufficient blood flow to the brain to meet metabolic demand. Discover the latest research on brain ischemia here.

Related Papers

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
Monika Harvey, Bettina Olk
Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
Alessio ToraldoA David Milner
Brain : a Journal of Neurology
E BisiachG Antonucci
© 2022 Meta ULC. All rights reserved