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Time to imagine space: a chronometric exploration of representational neglect.
Neuropsychologia. 2005; 43(9):1249-57.N

Abstract

When describing known places from memory, patients with left spatial neglect may mention more right- than left-sided items, thus showing representational, or imaginal, neglect. This suggests that these patients cannot either build or explore left locations in visual mental imagery. However, in place description there is no guarantee that patients are really employing visual mental imagery abilities, rather than verbal-propositional knowledge. Thus, patients providing symmetrical descriptions might be using other strategies than visual mental imagery. To address this issue, we devised a new test which strongly encourages the use of visual mental imagery. Twelve participants without brain damage and 12 right brain-damaged patients, of whom 7 had visual neglect, were invited to conjure up a visual mental image of the map of France. They subsequently had to state by pressing a left- or a right-sided key whether auditorily presented towns or regions were situated to the left or right of Paris on the imagined map. This provided measures of response time and accuracy for imagined locations. A further task, devised to assess response bias, used the words "left" or "right" as stimuli and the same keypress responses. Controls and non-neglect patients performed symmetrically. Neglect patients were slower for left than for right imagined locations. On single-case analysis, two patients with visual neglect had a greater response time asymmetry on the geographical task than predicted by the response bias task, but with symmetrical accuracy. The dissociation between response times and accuracy suggests that, in these patients, the left side of the mental map of space was not lost, but only "explored" less efficiently.

Authors+Show Affiliations

INSERM U610, and Fédération de Neurologie, Hôpital de la Salpêtrière (AP-HP), Pavillon Claude Bernard, Hôpital de la Salpêtrière, 47 bd de l'Hôpital, F-75013 Paris, France. paolo@broca.inserm.frNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

15949509

Citation

Bartolomeo, Paolo, et al. "Time to Imagine Space: a Chronometric Exploration of Representational Neglect." Neuropsychologia, vol. 43, no. 9, 2005, pp. 1249-57.
Bartolomeo P, Bachoud-Lévi AC, Azouvi P, et al. Time to imagine space: a chronometric exploration of representational neglect. Neuropsychologia. 2005;43(9):1249-57.
Bartolomeo, P., Bachoud-Lévi, A. C., Azouvi, P., & Chokron, S. (2005). Time to imagine space: a chronometric exploration of representational neglect. Neuropsychologia, 43(9), 1249-57.
Bartolomeo P, et al. Time to Imagine Space: a Chronometric Exploration of Representational Neglect. Neuropsychologia. 2005;43(9):1249-57. PubMed PMID: 15949509.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Time to imagine space: a chronometric exploration of representational neglect. AU - Bartolomeo,Paolo, AU - Bachoud-Lévi,Anne-Catherine, AU - Azouvi,Philippe, AU - Chokron,Sylvie, Y1 - 2005/02/12/ PY - 2004/06/17/received PY - 2004/12/08/revised PY - 2004/12/14/accepted PY - 2005/6/14/pubmed PY - 2005/9/1/medline PY - 2005/6/14/entrez SP - 1249 EP - 57 JF - Neuropsychologia JO - Neuropsychologia VL - 43 IS - 9 N2 - When describing known places from memory, patients with left spatial neglect may mention more right- than left-sided items, thus showing representational, or imaginal, neglect. This suggests that these patients cannot either build or explore left locations in visual mental imagery. However, in place description there is no guarantee that patients are really employing visual mental imagery abilities, rather than verbal-propositional knowledge. Thus, patients providing symmetrical descriptions might be using other strategies than visual mental imagery. To address this issue, we devised a new test which strongly encourages the use of visual mental imagery. Twelve participants without brain damage and 12 right brain-damaged patients, of whom 7 had visual neglect, were invited to conjure up a visual mental image of the map of France. They subsequently had to state by pressing a left- or a right-sided key whether auditorily presented towns or regions were situated to the left or right of Paris on the imagined map. This provided measures of response time and accuracy for imagined locations. A further task, devised to assess response bias, used the words "left" or "right" as stimuli and the same keypress responses. Controls and non-neglect patients performed symmetrically. Neglect patients were slower for left than for right imagined locations. On single-case analysis, two patients with visual neglect had a greater response time asymmetry on the geographical task than predicted by the response bias task, but with symmetrical accuracy. The dissociation between response times and accuracy suggests that, in these patients, the left side of the mental map of space was not lost, but only "explored" less efficiently. SN - 0028-3932 UR - https://www.unboundmedicine.com/medline/citation/15949509/Time_to_imagine_space:_a_chronometric_exploration_of_representational_neglect_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0028-3932(05)00008-4 DB - PRIME DP - Unbound Medicine ER -