Mechanisms of spatial distortion in unilateral neglect. Bartolomeo, P. In First Congress of the European Neuropsychological Societies, pages 34, Modena, Italy, 2004. abstract bibtex Lesions of the posterior regions of the right hemisphere often result in left unilateral neglect. Neglect patients ignore events occurring on their left, sometimes to the dramatic extent of 'forgetting' to eat from the left part of their dish or of bumping into obstacles situated on their left. When asked to bisect a horizontal line, they err towards the right end of the line. Neglect signs are likely to result from an association of several component deficits. Different deficits may be at work in different patients, but the frequency and severity of attentional problems in neglect have been repeatedly underlined. For example, attentional capture from right, ipsilesional stimuli is often evident in neglect patients, and suggests the presence of a directional bias in exogenous, or automatic, orienting of attention. However, different sorts of impairment, such as a distortion of spatial coordinates, have been advocated to explain particular pattern of performance, such as the rightward shifts in line bisection and other tasks. For example, it has been proposed that spatial coordinates are compressed from the left to the right, or that they progressively relax from the right to the left side. Here I present results indicating that the presence of right-sided objects is necessary to elicit neglect behaviour, even in those experimental conditions usually explained by invoking spatial distortion. Left neglect occurs only when a competing right object attract patients' attention. These results are problematic for hypotheses based on spatial distortion, because such problems of space representation should occur independently of the presence or absence of objects in space. Thus, patterns of performance previously explained as resulting from spatial distortion might be reconsidered in attentional terms. If confirmed, these notions may shed light on the influence of attentional processes in spatial cognition and may contribute to clear up the somewhat chaotic taxonomy of unilateral neglect.
@inproceedings{bartolomeo_mechanisms_2004,
address = {Modena, Italy},
title = {Mechanisms of spatial distortion in unilateral neglect},
abstract = {Lesions of the posterior regions of the right hemisphere often result in left unilateral neglect. Neglect patients ignore events occurring on their left, sometimes to the dramatic extent of 'forgetting' to eat from the left part of their dish or of bumping into obstacles situated on their left. When asked to bisect a horizontal line, they err towards the right end of the line. Neglect signs are likely to result from an association of several component deficits. Different deficits may be at work in different patients, but the frequency and severity of attentional problems in neglect have been repeatedly underlined. For example, attentional capture from right, ipsilesional stimuli is often evident in neglect patients, and suggests the presence of a directional bias in exogenous, or automatic, orienting of attention. However, different sorts of impairment, such as a distortion of spatial coordinates, have been advocated to explain particular pattern of performance, such as the rightward shifts in line bisection and other tasks. For example, it has been proposed that spatial coordinates are compressed from the left to the right, or that they progressively relax from the right to the left side. Here I present results indicating that the presence of right-sided objects is necessary to elicit neglect behaviour, even in those experimental conditions usually explained by invoking spatial distortion. Left neglect occurs only when a competing right object attract patients' attention. These results are problematic for hypotheses based on spatial distortion, because such problems of space representation should occur independently of the presence or absence of objects in space. Thus, patterns of performance previously explained as resulting from spatial distortion might be reconsidered in attentional terms. If confirmed, these notions may shed light on the influence of attentional processes in spatial cognition and may contribute to clear up the somewhat chaotic taxonomy of unilateral neglect.},
booktitle = {First {Congress} of the {European} {Neuropsychological} {Societies}},
author = {Bartolomeo, P.},
year = {2004},
keywords = {\#nosource, ⛔ No DOI found},
pages = {34},
}
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For example, attentional capture from right, ipsilesional stimuli is often evident in neglect patients, and suggests the presence of a directional bias in exogenous, or automatic, orienting of attention. However, different sorts of impairment, such as a distortion of spatial coordinates, have been advocated to explain particular pattern of performance, such as the rightward shifts in line bisection and other tasks. For example, it has been proposed that spatial coordinates are compressed from the left to the right, or that they progressively relax from the right to the left side. Here I present results indicating that the presence of right-sided objects is necessary to elicit neglect behaviour, even in those experimental conditions usually explained by invoking spatial distortion. Left neglect occurs only when a competing right object attract patients' attention. These results are problematic for hypotheses based on spatial distortion, because such problems of space representation should occur independently of the presence or absence of objects in space. Thus, patterns of performance previously explained as resulting from spatial distortion might be reconsidered in attentional terms. If confirmed, these notions may shed light on the influence of attentional processes in spatial cognition and may contribute to clear up the somewhat chaotic taxonomy of unilateral neglect.","booktitle":"First Congress of the European Neuropsychological Societies","author":[{"propositions":[],"lastnames":["Bartolomeo"],"firstnames":["P."],"suffixes":[]}],"year":"2004","keywords":"#nosource, ⛔ No DOI found","pages":"34","bibtex":"@inproceedings{bartolomeo_mechanisms_2004,\n\taddress = {Modena, Italy},\n\ttitle = {Mechanisms of spatial distortion in unilateral neglect},\n\tabstract = {Lesions of the posterior regions of the right hemisphere often result in left unilateral neglect. Neglect patients ignore events occurring on their left, sometimes to the dramatic extent of 'forgetting' to eat from the left part of their dish or of bumping into obstacles situated on their left. When asked to bisect a horizontal line, they err towards the right end of the line. 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Here I present results indicating that the presence of right-sided objects is necessary to elicit neglect behaviour, even in those experimental conditions usually explained by invoking spatial distortion. Left neglect occurs only when a competing right object attract patients' attention. These results are problematic for hypotheses based on spatial distortion, because such problems of space representation should occur independently of the presence or absence of objects in space. Thus, patterns of performance previously explained as resulting from spatial distortion might be reconsidered in attentional terms. 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