Optic ataxia in Bálint-Holmes syndrome / Laure Pisella in Annals of physical and rehabilitation medicine, Vol. 60, n° 3 (June 2017)

Public ISBD [article]  inAnnals of physical and rehabilitation medicine > Vol. 60, n° 3 (June 2017) . - p. 148-154 Titre : Optic ataxia in Bálint-Holmes syndrome Type de document : texte imprimé Auteurs : Laure Pisella, Auteur ; Yves Rossetti, Auteur ; Gilles Rode, Auteur Année de publication : 2017 Article en page(s) : p. 148-154 Langues : Anglais (eng) Français (fre) Mots-clés : Cerveau  Optic ataxia,Posterior parietal cortex,Dorsal attentional network Résumé : The objective of this review is to reinstate the diversity of visual perception and visuomotor symptoms following lesions to the posterior parietal cortex (dorsal visual stream). This diversity was overshadowed for a long time and shows the contribution of the dorsal visual stream not only to action but also to perception. More precisely, we propose that the visuomotor deficit in optic ataxia stems from two distinct components: visual proprioceptive deficit (hand effect) and visual attentional deficit (field effect) also affecting the perception in peripheral vision. Permalink : ./index.php?lvl=notice_display&id=51682 [article] Optic ataxia in Bálint-Holmes syndrome [texte imprimé] / Laure Pisella, Auteur ; Yves Rossetti, Auteur ; Gilles Rode, Auteur . - 2017 . - p. 148-154. Langues : Anglais (eng) Français (fre) in Annals of physical and rehabilitation medicine > Vol. 60, n° 3 (June 2017) . - p. 148-154 Mots-clés : Cerveau  Optic ataxia,Posterior parietal cortex,Dorsal attentional network Résumé : The objective of this review is to reinstate the diversity of visual perception and visuomotor symptoms following lesions to the posterior parietal cortex (dorsal visual stream). This diversity was overshadowed for a long time and shows the contribution of the dorsal visual stream not only to action but also to perception. More precisely, we propose that the visuomotor deficit in optic ataxia stems from two distinct components: visual proprioceptive deficit (hand effect) and visual attentional deficit (field effect) also affecting the perception in peripheral vision. Permalink : ./index.php?lvl=notice_display&id=51682

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Rise and fall of the two visual systems theory / Yves Rossetti in Annals of physical and rehabilitation medicine, Vol. 60, n° 3 (June 2017)

Public ISBD [article]  inAnnals of physical and rehabilitation medicine > Vol. 60, n° 3 (June 2017) . - p. 130-140 Titre : Rise and fall of the two visual systems theory Type de document : texte imprimé Auteurs : Yves Rossetti, Auteur ; Laure Pisella, Auteur ; Robert D. McIntosh, Auteur Année de publication : 2017 Article en page(s) : p. 130-140 Langues : Anglais (eng) Français (fre) Mots-clés : Vision  Vision,Action,Dorsal,Optic ataxia,Visuomotor Résumé : Among the many dissociations describing the visual system, the dual theory of two visual systems, respectively dedicated to perception and action, has yielded a lot of support. There are psychophysical, anatomical and neuropsychological arguments in favor of this theory. Several behavioral studies that used sensory and motor psychophysical parameters observed differences between perceptive and motor responses. The anatomical network of the visual system in the non-human primate was very readily organized according to two major pathways, dorsal and ventral. Neuropsychological studies, exploring optic ataxia and visual agnosia as characteristic deficits of these two pathways, led to the proposal of a functional double dissociation between visuomotor and visual perceptual functions. After a major wave of popularity that promoted great advances, particularly in knowledge of visuomotor functions, the guiding theory is now being reconsidered. Firstly, the idea of a double dissociation between optic ataxia and visual form agnosia, as cleanly separating visuomotor from visual perceptual functions, is no longer tenable; optic ataxia does not support a dissociation between perception and action and might be more accurately viewed as a negative image of action blindsight. Secondly, dissociations between perceptive and motor responses highlighted in the framework of this theory concern a very elementary level of action, even automatically guided action routines. Thirdly, the very rich interconnected network of the visual brain yields few arguments in favor of a strict perception/action dissociation. Overall, the dissociation between motor function and perceptive function explored by these behavioral and neuropsychological studies can help define an automatic level of action organization deficient in optic ataxia and preserved in action blindsight, and underlines the renewed need to consider the perception-action circle as a functional ensemble. Permalink : ./index.php?lvl=notice_display&id=51690 [article] Rise and fall of the two visual systems theory [texte imprimé] / Yves Rossetti, Auteur ; Laure Pisella, Auteur ; Robert D. McIntosh, Auteur . - 2017 . - p. 130-140. Langues : Anglais (eng) Français (fre) in Annals of physical and rehabilitation medicine > Vol. 60, n° 3 (June 2017) . - p. 130-140 Mots-clés : Vision  Vision,Action,Dorsal,Optic ataxia,Visuomotor Résumé : Among the many dissociations describing the visual system, the dual theory of two visual systems, respectively dedicated to perception and action, has yielded a lot of support. There are psychophysical, anatomical and neuropsychological arguments in favor of this theory. Several behavioral studies that used sensory and motor psychophysical parameters observed differences between perceptive and motor responses. The anatomical network of the visual system in the non-human primate was very readily organized according to two major pathways, dorsal and ventral. Neuropsychological studies, exploring optic ataxia and visual agnosia as characteristic deficits of these two pathways, led to the proposal of a functional double dissociation between visuomotor and visual perceptual functions. After a major wave of popularity that promoted great advances, particularly in knowledge of visuomotor functions, the guiding theory is now being reconsidered. Firstly, the idea of a double dissociation between optic ataxia and visual form agnosia, as cleanly separating visuomotor from visual perceptual functions, is no longer tenable; optic ataxia does not support a dissociation between perception and action and might be more accurately viewed as a negative image of action blindsight. Secondly, dissociations between perceptive and motor responses highlighted in the framework of this theory concern a very elementary level of action, even automatically guided action routines. Thirdly, the very rich interconnected network of the visual brain yields few arguments in favor of a strict perception/action dissociation. Overall, the dissociation between motor function and perceptive function explored by these behavioral and neuropsychological studies can help define an automatic level of action organization deficient in optic ataxia and preserved in action blindsight, and underlines the renewed need to consider the perception-action circle as a functional ensemble. Permalink : ./index.php?lvl=notice_display&id=51690

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Using eye movements to explore mental representations of space / Myriam Fourtassi in Annals of physical and rehabilitation medicine, Vol. 60, n° 3 (June 2017)

Public ISBD [article]  inAnnals of physical and rehabilitation medicine > Vol. 60, n° 3 (June 2017) . - p. 160-163 Titre : Using eye movements to explore mental representations of space Type de document : texte imprimé Auteurs : Myriam Fourtassi, Auteur ; Laure Pisella, Auteur ; Gilles Rode, Auteur Année de publication : 2017 Article en page(s) : p. 160-163 Langues : Anglais (eng) Français (fre) Mots-clés : Représentation  Vision  Oeil  Visual imagery,Ocular-tracking,Bi-dimensional regression,Mental representation of space Résumé : Visual mental imagery is a cognitive experience characterised by the activation of the mental representation of an object or scene in the absence of the corresponding stimulus. According to the analogical theory, mental representations have a pictorial nature that preserves the spatial characteristics of the environment that is mentally represented. This cognitive experience shares many similarities with the experience of visual perception, including eye movements. The mental visualisation of a scene is accompanied by eye movements that reflect the spatial content of the mental image, and which can mirror the deformations of this mental image with respect to the real image, such as asymmetries or size reduction. The present article offers a concise overview of the main theories explaining the interactions between eye movements and mental representations, with some examples of the studies supporting them. It also aims to explain how ocular-tracking could be a useful tool in exploring the dynamics of spatial mental representations, especially in pathological situations where these representations can be altered, for instance in unilateral spatial neglect. Permalink : ./index.php?lvl=notice_display&id=51698 [article] Using eye movements to explore mental representations of space [texte imprimé] / Myriam Fourtassi, Auteur ; Laure Pisella, Auteur ; Gilles Rode, Auteur . - 2017 . - p. 160-163. Langues : Anglais (eng) Français (fre) in Annals of physical and rehabilitation medicine > Vol. 60, n° 3 (June 2017) . - p. 160-163 Mots-clés : Représentation  Vision  Oeil  Visual imagery,Ocular-tracking,Bi-dimensional regression,Mental representation of space Résumé : Visual mental imagery is a cognitive experience characterised by the activation of the mental representation of an object or scene in the absence of the corresponding stimulus. According to the analogical theory, mental representations have a pictorial nature that preserves the spatial characteristics of the environment that is mentally represented. This cognitive experience shares many similarities with the experience of visual perception, including eye movements. The mental visualisation of a scene is accompanied by eye movements that reflect the spatial content of the mental image, and which can mirror the deformations of this mental image with respect to the real image, such as asymmetries or size reduction. The present article offers a concise overview of the main theories explaining the interactions between eye movements and mental representations, with some examples of the studies supporting them. It also aims to explain how ocular-tracking could be a useful tool in exploring the dynamics of spatial mental representations, especially in pathological situations where these representations can be altered, for instance in unilateral spatial neglect. Permalink : ./index.php?lvl=notice_display&id=51698

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Validation of a simple screening test for elementary visuo-spatial perception deficit / Laure Pisella in Annals of physical and rehabilitation medicine, Vol. 63, n°4 (Juillet 2020)

Public ISBD [article]  inAnnals of physical and rehabilitation medicine > Vol. 63, n°4 (Juillet 2020) . - p. 302-308 Titre : Validation of a simple screening test for elementary visuo-spatial perception deficit Type de document : texte imprimé Auteurs : Laure Pisella ; Marie Martel ; Alice C. Roy ; Carole Vuillerot ; Sibylle Gonzalez-Monge Année de publication : 2020 Article en page(s) : p. 302-308 Note générale : doi.org/10.1016/j.rehab.2019.03.006 Langues : Anglais (eng) Résumé : Objective The reliability and validity of a screening test for a deficit in elementary visuo-spatial perception (EVSP) were evaluated. Method This prospective study collected performance from 210 typically developing individuals and evaluated the internal consistency of the EVSP screening test. Test–retest reliability was examined with 25 individuals. Validity also involved retrospective clinical data collected from 223 non-typically developing children coming to the hospital for outpatient consultation. Since EVSP matures through childhood, we standardized the EVSP screening test scores by age category and performed Pearson correlations with standardized clinical tests scores. Results Test–retest reliability (intraclass correlation coefficient = 0.76) and internal consistency (Cronbach's alpha = 0.76) were satisfactory. Construct validity included correlation with the subtests of the Wechsler Intelligence Scale IV (WISC-IV) involving visuo-spatial analysis (Matrix Reasoning and Block Design, P < 0.01; Symbol Search and Coding, P < 0.05) and was reinforced by the expected non-correlation between the Verbal Comprehension Index and EVSP scoring class. The EVSP scoring class was correlated with Manual dexterity of the M-ABC (P < 0.05) and the Working Memory Index (P < 0.05) of the WISC-IV including the subtest Arithmetic (P < 0.01). Conclusion This screening test is reliable and valid to evaluate EVSP before more complex cognitive or motor assessment. Permalink : ./index.php?lvl=notice_display&id=90875 [article] Validation of a simple screening test for elementary visuo-spatial perception deficit [texte imprimé] / Laure Pisella ; Marie Martel ; Alice C. Roy ; Carole Vuillerot ; Sibylle Gonzalez-Monge . - 2020 . - p. 302-308. doi.org/10.1016/j.rehab.2019.03.006 Langues : Anglais (eng) in Annals of physical and rehabilitation medicine > Vol. 63, n°4 (Juillet 2020) . - p. 302-308 Résumé : Objective The reliability and validity of a screening test for a deficit in elementary visuo-spatial perception (EVSP) were evaluated. Method This prospective study collected performance from 210 typically developing individuals and evaluated the internal consistency of the EVSP screening test. Test–retest reliability was examined with 25 individuals. Validity also involved retrospective clinical data collected from 223 non-typically developing children coming to the hospital for outpatient consultation. Since EVSP matures through childhood, we standardized the EVSP screening test scores by age category and performed Pearson correlations with standardized clinical tests scores. Results Test–retest reliability (intraclass correlation coefficient = 0.76) and internal consistency (Cronbach's alpha = 0.76) were satisfactory. Construct validity included correlation with the subtests of the Wechsler Intelligence Scale IV (WISC-IV) involving visuo-spatial analysis (Matrix Reasoning and Block Design, P < 0.01; Symbol Search and Coding, P < 0.05) and was reinforced by the expected non-correlation between the Verbal Comprehension Index and EVSP scoring class. The EVSP scoring class was correlated with Manual dexterity of the M-ABC (P < 0.05) and the Working Memory Index (P < 0.05) of the WISC-IV including the subtest Arithmetic (P < 0.01). Conclusion This screening test is reliable and valid to evaluate EVSP before more complex cognitive or motor assessment. Permalink : ./index.php?lvl=notice_display&id=90875

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Visual perception is dependent on visuospatial working memory and thus on the posterior parietal cortex / Laure Pisella in Annals of physical and rehabilitation medicine, Vol. 60, n° 3 (June 2017)

Public ISBD [article]  inAnnals of physical and rehabilitation medicine > Vol. 60, n° 3 (June 2017) . - p. 141-147 Titre : Visual perception is dependent on visuospatial working memory and thus on the posterior parietal cortex Type de document : texte imprimé Auteurs : Laure Pisella, Auteur Année de publication : 2017 Article en page(s) : p. 141-147 Langues : Anglais (eng) Français (fre) Mots-clés : Vision  Mémoire visuelle  Mémoire  Cerveau  Visual perception,Spatial working memory,Trans-saccadic remapping,Posterior parietal cortex,Inhibition of return Résumé : Visual perception involves complex and active processes. We will start by explaining why visual perception is dependent on visuospatial working memory, especially the spatiotemporal integration of the perceived elements through the ocular exploration of visual scenes. Then we will present neuropsychology, transcranial magnetic stimulation and neuroimaging data yielding information on the specific role of the posterior parietal cortex of the right hemisphere in visuospatial working memory. Within the posterior parietal cortex, neuropsychology data also suggest that there might be dissociated neural substrates for deployment of attention (superior parietal lobules) and spatiotemporal integration (right inferior parietal lobule). Permalink : ./index.php?lvl=notice_display&id=51700 [article] Visual perception is dependent on visuospatial working memory and thus on the posterior parietal cortex [texte imprimé] / Laure Pisella, Auteur . - 2017 . - p. 141-147. Langues : Anglais (eng) Français (fre) in Annals of physical and rehabilitation medicine > Vol. 60, n° 3 (June 2017) . - p. 141-147 Mots-clés : Vision  Mémoire visuelle  Mémoire  Cerveau  Visual perception,Spatial working memory,Trans-saccadic remapping,Posterior parietal cortex,Inhibition of return Résumé : Visual perception involves complex and active processes. We will start by explaining why visual perception is dependent on visuospatial working memory, especially the spatiotemporal integration of the perceived elements through the ocular exploration of visual scenes. Then we will present neuropsychology, transcranial magnetic stimulation and neuroimaging data yielding information on the specific role of the posterior parietal cortex of the right hemisphere in visuospatial working memory. Within the posterior parietal cortex, neuropsychology data also suggest that there might be dissociated neural substrates for deployment of attention (superior parietal lobules) and spatiotemporal integration (right inferior parietal lobule). Permalink : ./index.php?lvl=notice_display&id=51700

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