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The middle house or the middle floor: Bisecting horizontal and vertical mental number lines in neglect

This study explores the processing of mental number lines and physical lines in five patients with left unilateral neglect. Three tasks were used: mental number bisection (‘report the middle number between two numbers’), physical line bisection (‘mark the middle of a line’), and a landmark task (‘is...

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Detalles Bibliográficos
Autores principales: Cappelletti, Marinella, Freeman, Elliot D., Cipolotti, Lisa
Formato: Texto
Lenguaje:English
Publicado: Pergamon Press 2007
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2567815/
https://www.ncbi.nlm.nih.gov/pubmed/17640687
http://dx.doi.org/10.1016/j.neuropsychologia.2007.05.014
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author Cappelletti, Marinella
Freeman, Elliot D.
Cipolotti, Lisa
author_facet Cappelletti, Marinella
Freeman, Elliot D.
Cipolotti, Lisa
author_sort Cappelletti, Marinella
collection PubMed
description This study explores the processing of mental number lines and physical lines in five patients with left unilateral neglect. Three tasks were used: mental number bisection (‘report the middle number between two numbers’), physical line bisection (‘mark the middle of a line’), and a landmark task (‘is the mark on the line to the left/right or higher/lower than the middle of the line?’). We manipulated the number line orientation purely by task instruction: neglect patients were told that the number-pairs represented either houses on a street (horizontal condition) or floors in a building (vertical condition). We also manipulated physical line orientation for comparison. All five neglect patients showed a rightward bias for horizontally oriented physical and number lines (e.g. saying ‘five’ is the middle house number between ‘two’ and ‘six’). Only three of these patients also showed an upward bias for vertically oriented number lines. The remaining two patients did not show any bias in processing vertical lines. Our results suggest that: (1) horizontal and vertical neglect can associate or dissociate among different patients; (2) bisecting number lines operates on internal horizontal and vertical representations possibly analogous to horizontal and vertical physical lines; (3) at least partially independent mechanisms may be involved in processing horizontal and vertical number lines.
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spelling pubmed-25678152008-10-15 The middle house or the middle floor: Bisecting horizontal and vertical mental number lines in neglect Cappelletti, Marinella Freeman, Elliot D. Cipolotti, Lisa Neuropsychologia Article This study explores the processing of mental number lines and physical lines in five patients with left unilateral neglect. Three tasks were used: mental number bisection (‘report the middle number between two numbers’), physical line bisection (‘mark the middle of a line’), and a landmark task (‘is the mark on the line to the left/right or higher/lower than the middle of the line?’). We manipulated the number line orientation purely by task instruction: neglect patients were told that the number-pairs represented either houses on a street (horizontal condition) or floors in a building (vertical condition). We also manipulated physical line orientation for comparison. All five neglect patients showed a rightward bias for horizontally oriented physical and number lines (e.g. saying ‘five’ is the middle house number between ‘two’ and ‘six’). Only three of these patients also showed an upward bias for vertically oriented number lines. The remaining two patients did not show any bias in processing vertical lines. Our results suggest that: (1) horizontal and vertical neglect can associate or dissociate among different patients; (2) bisecting number lines operates on internal horizontal and vertical representations possibly analogous to horizontal and vertical physical lines; (3) at least partially independent mechanisms may be involved in processing horizontal and vertical number lines. Pergamon Press 2007 /pmc/articles/PMC2567815/ /pubmed/17640687 http://dx.doi.org/10.1016/j.neuropsychologia.2007.05.014 Text en © 2007 Elsevier Ltd. https://creativecommons.org/licenses/by/3.0/ Open Access under CC BY 3.0 (https://creativecommons.org/licenses/by/3.0/) license
spellingShingle Article
Cappelletti, Marinella
Freeman, Elliot D.
Cipolotti, Lisa
The middle house or the middle floor: Bisecting horizontal and vertical mental number lines in neglect
title The middle house or the middle floor: Bisecting horizontal and vertical mental number lines in neglect
title_full The middle house or the middle floor: Bisecting horizontal and vertical mental number lines in neglect
title_fullStr The middle house or the middle floor: Bisecting horizontal and vertical mental number lines in neglect
title_full_unstemmed The middle house or the middle floor: Bisecting horizontal and vertical mental number lines in neglect
title_short The middle house or the middle floor: Bisecting horizontal and vertical mental number lines in neglect
title_sort middle house or the middle floor: bisecting horizontal and vertical mental number lines in neglect
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2567815/
https://www.ncbi.nlm.nih.gov/pubmed/17640687
http://dx.doi.org/10.1016/j.neuropsychologia.2007.05.014
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